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eclipse / jdt / eclipse.jdt.core / I20150913-2000 / . / org.eclipse.jdt.core.tests.compiler / src / org / eclipse / jdt / core / tests / compiler / regression / NullTypeAnnotationTest.java
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/*******************************************************************************
* Copyright (c) 2012, 2015 GK Software AG and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Stephan Herrmann - initial API and implementation
* IBM Corporation
* Till Brychcy - Contribution for
* Bug 467032 - TYPE_USE Null Annotations: IllegalStateException with annotated arrays of Enum when accessed via BinaryTypeBinding
*******************************************************************************/
package org.eclipse.jdt.core.tests.compiler.regression;
import java.io.File;
import java.util.Map;
import junit.framework.Test;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.core.tests.util.Util;
@SuppressWarnings({ "unchecked", "rawtypes" })
public class NullTypeAnnotationTest extends AbstractNullAnnotationTest {
public NullTypeAnnotationTest(String name) {
super(name);
}
// Static initializer to specify tests subset using TESTS_* static variables
// All specified tests which do not belong to the class are skipped...
static {
// TESTS_NAMES = new String[] { "testBug456497" };
// TESTS_NUMBERS = new int[] { 561 };
// TESTS_RANGE = new int[] { 1, 2049 };
}
public static Test suite() {
return buildMinimalComplianceTestSuite(testClass(), F_1_8);
}
public static Class testClass() {
return NullTypeAnnotationTest.class;
}
// a list with nullable elements is used
public void test_nonnull_list_elements_01() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.List;\n" +
"public class X {\n" +
" void foo(List<@Nullable Object> l) {\n" +
" System.out.print(l.get(0).toString()); // problem: retrieved element can be null\n" +
" l.add(null);\n" +
" }\n" +
" void bar(java.util.List<@Nullable Object> l) {\n" +
" System.out.print(l.get(1).toString()); // problem: retrieved element can be null\n" +
" l.add(null);\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in X.java (at line 5)\n" +
" System.out.print(l.get(0).toString()); // problem: retrieved element can be null\n" +
" ^^^^^^^^\n" +
"Potential null pointer access: The method get(int) may return null\n" +
"----------\n" +
"2. ERROR in X.java (at line 9)\n" +
" System.out.print(l.get(1).toString()); // problem: retrieved element can be null\n" +
" ^^^^^^^^\n" +
"Potential null pointer access: The method get(int) may return null\n" +
"----------\n");
}
// a list with nullable elements is used, custom annotations
public void test_nonnull_list_elements_01a() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_NULLABLE_ANNOTATION_NAME, "org.foo.Nullable");
customOptions.put(JavaCore.COMPILER_NONNULL_ANNOTATION_NAME, "org.foo.NonNull");
runNegativeTest(
new String[] {
CUSTOM_NULLABLE_NAME,
CUSTOM_NULLABLE_CONTENT_JSR308,
CUSTOM_NONNULL_NAME,
CUSTOM_NONNULL_CONTENT_JSR308,
"X.java",
"import org.foo.*;\n" +
"import java.util.List;\n" +
"public class X {\n" +
" void foo(List<@Nullable Object> l) {\n" +
" System.out.print(l.get(0).toString()); // problem: retrieved element can be null\n" +
" l.add(null);\n" +
" }\n" +
" void bar(java.util.List<@Nullable Object> l) {\n" +
" System.out.print(l.get(1).toString()); // problem: retrieved element can be null\n" +
" l.add(null);\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in X.java (at line 5)\n" +
" System.out.print(l.get(0).toString()); // problem: retrieved element can be null\n" +
" ^^^^^^^^\n" +
"Potential null pointer access: The method get(int) may return null\n" +
"----------\n" +
"2. ERROR in X.java (at line 9)\n" +
" System.out.print(l.get(1).toString()); // problem: retrieved element can be null\n" +
" ^^^^^^^^\n" +
"Potential null pointer access: The method get(int) may return null\n" +
"----------\n",
null,
true, /* shouldFlush*/
customOptions);
}
// a list with nullable elements is used, @Nullable is second annotation
public void test_nonnull_list_elements_02() {
runNegativeTestWithLibs(
new String[] {
"Dummy.java",
"import static java.lang.annotation.ElementType.*;\n" +
"import java.lang.annotation.*;\n" +
"@Retention(RetentionPolicy.CLASS)\n" +
"@Target({METHOD,PARAMETER,LOCAL_VARIABLE,TYPE_USE})\n" +
"public @interface Dummy {\n" +
"}\n",
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.List;\n" +
"public class X {\n" +
" void foo(List<@Dummy @Nullable Object> l) {\n" +
" System.out.print(l.get(0).toString()); // problem: retrieved element can be null\n" +
" l.add(null);\n" +
" }\n" +
" void bar(java.util.List<@Dummy @Nullable Object> l) {\n" +
" System.out.print(l.get(1).toString()); // problem: retrieved element can be null\n" +
" l.add(null);\n" +
" }\n" +
" void bar2(java.util.List<java.lang.@Dummy @Nullable Object> l2) {\n" +
" System.out.print(l2.get(1).toString()); // problem: retrieved element can be null\n" +
" l2.add(null);\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in X.java (at line 5)\n" +
" System.out.print(l.get(0).toString()); // problem: retrieved element can be null\n" +
" ^^^^^^^^\n" +
"Potential null pointer access: The method get(int) may return null\n" +
"----------\n" +
"2. ERROR in X.java (at line 9)\n" +
" System.out.print(l.get(1).toString()); // problem: retrieved element can be null\n" +
" ^^^^^^^^\n" +
"Potential null pointer access: The method get(int) may return null\n" +
"----------\n" +
"3. ERROR in X.java (at line 13)\n" +
" System.out.print(l2.get(1).toString()); // problem: retrieved element can be null\n" +
" ^^^^^^^^^\n" +
"Potential null pointer access: The method get(int) may return null\n" +
"----------\n");
}
// a list with non-null elements is used, list itself is nullable
public void test_nonnull_list_elements_03() {
runNegativeTestWithLibs(
new String[] {
"Dummy.java",
"import static java.lang.annotation.ElementType.*;\n" +
"import java.lang.annotation.*;\n" +
"@Retention(RetentionPolicy.CLASS)\n" +
"@Target({METHOD,PARAMETER,LOCAL_VARIABLE,TYPE_USE})\n" +
"public @interface Dummy {\n" +
"}\n",
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.List;\n" +
"public class X {\n" +
" void foo(@Nullable List<@NonNull Object> l) {\n" +
" System.out.print(l.get(0).toString()); // problem: l may be null\n" +
" l.add(null); // problem: cannot insert 'null' into this list\n" +
" }\n" +
" void bar(@Nullable List<java.lang.@NonNull Object> l) {\n" +
" System.out.print(l.get(0).toString()); // problem: l may be null\n" +
" l.add(0, null); // problem: cannot insert 'null' into this list\n" +
" }\n" +
" void bar2(@Dummy java.util.@Nullable List<java.lang.@NonNull Object> l2) {\n" +
" System.out.print(l2.get(0).toString()); // problem: l2 may be null\n" +
" l2.add(0, null); // problem: cannot insert 'null' into this list\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in X.java (at line 5)\n" +
" System.out.print(l.get(0).toString()); // problem: l may be null\n" +
" ^\n" +
"Potential null pointer access: this expression has a '@Nullable' type\n" +
"----------\n" +
"2. ERROR in X.java (at line 6)\n" +
" l.add(null); // problem: cannot insert \'null\' into this list\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Object\' but the provided value is null\n" +
"----------\n" +
"3. ERROR in X.java (at line 9)\n" +
" System.out.print(l.get(0).toString()); // problem: l may be null\n" +
" ^\n" +
"Potential null pointer access: this expression has a '@Nullable' type\n" +
"----------\n" +
"4. ERROR in X.java (at line 10)\n" +
" l.add(0, null); // problem: cannot insert \'null\' into this list\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Object\' but the provided value is null\n" +
"----------\n" +
"5. ERROR in X.java (at line 13)\n" +
" System.out.print(l2.get(0).toString()); // problem: l2 may be null\n" +
" ^^\n" +
"Potential null pointer access: this expression has a '@Nullable' type\n" +
"----------\n" +
"6. ERROR in X.java (at line 14)\n" +
" l2.add(0, null); // problem: cannot insert \'null\' into this list\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Object\' but the provided value is null\n" +
"----------\n");
}
// an outer and inner class both have a type parameter,
// client instantiates with nullable/nonnull actual type arguments
public void test_nestedType_01() {
runNegativeTestWithLibs(
new String[] {
"A.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class A<X> {\n" +
" public class I<Y> {\n" +
" X anX;\n" +
" public X foo(Y l) {\n" +
" return anX;\n" +
" }\n" +
" }\n" +
" void bar(A<@Nullable Object>.I<@NonNull Object> i) {\n" + // legal instantiation
" @NonNull Object o = i.foo(null); // problems: argument and assignment violate null contracts\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in A.java (at line 10)\n" +
" @NonNull Object o = i.foo(null); // problems: argument and assignment violate null contracts\n" +
" ^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required '@NonNull Object' but this expression has type '@Nullable Object'\n" +
"----------\n" +
"2. ERROR in A.java (at line 10)\n" +
" @NonNull Object o = i.foo(null); // problems: argument and assignment violate null contracts\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Object\' but the provided value is null\n" +
"----------\n");
}
// an outer and inner class both have a type parameter,
// a subclass instantiates with nullable/nonnull actual type arguments
// and correctly implements an abstract inherited method
// compile errors only inside that method
public void test_nestedType_02() {
runNegativeTestWithLibs(
new String[] {
"A.java",
"public class A<X> {\n" +
" public abstract class I<Y> {\n" +
" public abstract X foo(Y l);\n" +
" public X idX(X in) { return in; }\n" +
" public Y idY(Y in) { return in; }\n" +
" }\n" +
"}\n",
"B.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class B extends A<@NonNull Object> {\n" +
" public class J extends I<@Nullable String> {\n" +
" @Override\n" +
" public @NonNull Object foo(@Nullable String l) {\n" +
" System.out.print(idX(null));\n" +
" return idY(null);\n" +
" }\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in B.java (at line 6)\n" +
" System.out.print(idX(null));\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Object\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in B.java (at line 7)\n" +
" return idY(null);\n" +
" ^^^^^^^^^\n" +
"Null type mismatch (type annotations): required '@NonNull Object' but this expression has type '@Nullable String'\n" +
"----------\n");
}
// an outer and inner class both have a type parameter,
// a subclass instantiates with nullable/nonnull actual type arguments
// and incorrectly implements an abstract inherited method
public void test_nestedType_03() {
runNegativeTestWithLibs(
new String[] {
"A.java",
"public class A<X> {\n" +
" public abstract class I<Y> {\n" +
" public abstract X foo(Y l);\n" +
" }\n" +
"}\n",
"B.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class B extends A<@NonNull Object> {\n" +
" public class J extends I<@Nullable String> {\n" +
" @Override\n" +
" public @Nullable Object foo(@NonNull String l) {\n" +
" return null;\n" +
" }\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in B.java (at line 5)\n" +
" public @Nullable Object foo(@NonNull String l) {\n" +
" ^^^^^^^^^^^^^^^^\n" +
"The return type is incompatible with '@NonNull Object' returned from A<Object>.I<String>.foo(String) (mismatching null constraints)\n" +
"----------\n" +
"2. ERROR in B.java (at line 5)\n" +
" public @Nullable Object foo(@NonNull String l) {\n" +
" ^^^^^^^^^^^^^^^\n" +
"Illegal redefinition of parameter l, inherited method from A<Object>.I<String> declares this parameter as @Nullable\n" +
"----------\n");
}
// a reference to a nested type has annotations for both types
public void test_nestedType_04() {
runNegativeTestWithLibs(
new String[] {
"A.java",
"public class A<X> {\n" +
" public abstract class I<Y> {\n" +
" public abstract X foo(Y l);\n" +
" }\n" +
"}\n",
"B.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class B {\n" +
" public void foo(A<Object>.@Nullable I<@NonNull String> ai) {\n" +
" ai.foo(null); // problems: ai can be null, arg must not be null\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in B.java (at line 4)\n" +
" ai.foo(null); // problems: ai can be null, arg must not be null\n" +
" ^^\n" +
"Potential null pointer access: this expression has a '@Nullable' type\n" +
"----------\n" +
"2. ERROR in B.java (at line 4)\n" +
" ai.foo(null); // problems: ai can be null, arg must not be null\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n");
}
// a reference to a nested type has annotations for both types, mismatch in detail of outer
public void test_nestedType_05() {
runNegativeTestWithLibs(
new String[] {
"A.java",
"public class A<X> {\n" +
" public abstract class I<Y> {\n" +
" public abstract X foo(Y l);\n" +
" }\n" +
"}\n",
"B.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class B {\n" +
" public void foo(A<@NonNull Object>.@Nullable I<@NonNull String> ai1) {\n" +
" A<@Nullable Object>.@Nullable I<@NonNull String> ai2 = ai1;\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in B.java (at line 4)\n" +
" A<@Nullable Object>.@Nullable I<@NonNull String> ai2 = ai1;\n" +
" ^^^\n" +
"Null type mismatch (type annotations): required \'A<@Nullable Object>.@Nullable I<@NonNull String>\' but this expression has type \'A<@NonNull Object>.@Nullable I<@NonNull String>\'\n" +
"----------\n");
}
public void testMissingAnnotationTypes_01() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"public class X {\n" +
" public class U {}\n" +
" @Missing1 X.@Missing2 U fU;\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 3)\n" +
" @Missing1 X.@Missing2 U fU;\n" +
" ^^^^^^^^\n" +
"Missing1 cannot be resolved to a type\n" +
"----------\n" +
"2. ERROR in X.java (at line 3)\n" +
" @Missing1 X.@Missing2 U fU;\n" +
" ^^^^^^^^\n" +
"Missing2 cannot be resolved to a type\n" +
"----------\n");
}
// bug 392862 - [1.8][compiler][null] Evaluate null annotations on array types
// annotation on leaf type in 1-dim array
public void testArrayType_01() {
runNegativeTestWithLibs(
new String[] {
"Wrapper.java",
"public class Wrapper<T> {\n" +
" T content;" +
" public T content() { return content; }\n" +
"}\n",
"A.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class A {\n" +
// Using Wrapper is a workaround until bug 391331 is fixed (to force the interesting annotation to be consumed as a type annotation):
" void bar(Wrapper<@NonNull String[]> realStrings, Wrapper<@Nullable String[]> maybeStrings) {\n" +
" System.out.println(realStrings.content()[0].toUpperCase()); // no problem\n" +
" realStrings.content()[0] = null; // problem: cannot assign null as @NonNull element\n" +
" System.out.println(maybeStrings.content()[0].toUpperCase()); // problem: element can be null\n" +
" maybeStrings.content()[0] = null; // no problem\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in A.java (at line 5)\n" +
" realStrings.content()[0] = null; // problem: cannot assign null as @NonNull element\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in A.java (at line 6)\n" +
" System.out.println(maybeStrings.content()[0].toUpperCase()); // problem: element can be null\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Potential null pointer access: array element may be null\n" +
"----------\n");
}
// bug 392862 - [1.8][compiler][null] Evaluate null annotations on array types
// annotation on leaf type in 2-dim array
public void testArrayType_02() {
runNegativeTestWithLibs(
new String[] {
"Wrapper.java",
"public class Wrapper<T> {\n" +
" T content;" +
" public T content() { return content; }\n" +
"}\n",
"A.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class A {\n" +
// Using Wrapper is a workaround until bug 391331 is fixed (to force the interesting annotation to be consumed as a type annotation):
" void bar(Wrapper<@NonNull String[][]> realStrings, Wrapper<@Nullable String[][]> maybeStrings) {\n" +
" System.out.println(realStrings.content()[0][0].toUpperCase()); // no problem\n" +
" realStrings.content()[0][0] = null; // problem: cannot assign null as @NonNull element\n" +
" System.out.println(maybeStrings.content()[0][0].toUpperCase()); // problem: element can be null\n" +
" maybeStrings.content()[0][0] = null; // no problem\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in A.java (at line 5)\n" +
" realStrings.content()[0][0] = null; // problem: cannot assign null as @NonNull element\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in A.java (at line 6)\n" +
" System.out.println(maybeStrings.content()[0][0].toUpperCase()); // problem: element can be null\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Potential null pointer access: array element may be null\n" +
"----------\n");
}
// bug 392862 - [1.8][compiler][null] Evaluate null annotations on array types
// annotation on array type (1-dim array)
public void testArrayType_03() {
runNegativeTestWithLibs(
new String[] {
"A.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class A {\n" +
" void array(String @NonNull[] realStringArray, String @Nullable[] maybeStringArray) {\n" +
" @NonNull Object array;\n" +
" array = realStringArray; // no problem\n" +
" realStringArray = null; // problem: cannot assign null as @NonNull array\n" +
" array = maybeStringArray; // problem: array can be null\n" +
" maybeStringArray = null; // no problem\n" +
" }\n" +
" void leaf(String @NonNull[] realStringArray, String @Nullable[] maybeStringArray, boolean b) {\n" +
" @NonNull String string;\n" +
" string = realStringArray[0]; // problem: unchecked conversion\n" +
" realStringArray[0] = null; // no problem\n" +
" if (b)\n" +
" string = maybeStringArray[0]; // problems: indexing nullable array & unchecked conversion\n" +
" else\n" +
" maybeStringArray[0] = null; // problem: indexing nullable array\n" +
" maybeStringArray[0] = null; // problem protected by previous dereference\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in A.java (at line 6)\n" +
" realStringArray = null; // problem: cannot assign null as @NonNull array\n" +
" ^^^^\n" +
"Null type mismatch: required \'String @NonNull[]\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in A.java (at line 7)\n" +
" array = maybeStringArray; // problem: array can be null\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required '@NonNull Object' but this expression has type 'String @Nullable[]'\n" +
"----------\n" +
"3. WARNING in A.java (at line 12)\n" +
" string = realStringArray[0]; // problem: unchecked conversion\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type 'String' needs unchecked conversion to conform to \'@NonNull String\'\n" +
"----------\n" +
"4. ERROR in A.java (at line 15)\n" +
" string = maybeStringArray[0]; // problems: indexing nullable array & unchecked conversion\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Potential null pointer access: this expression has a '@Nullable' type\n" +
"----------\n" +
"5. WARNING in A.java (at line 15)\n" +
" string = maybeStringArray[0]; // problems: indexing nullable array & unchecked conversion\n" +
" ^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type 'String' needs unchecked conversion to conform to \'@NonNull String\'\n" +
"----------\n" +
"6. ERROR in A.java (at line 17)\n" +
" maybeStringArray[0] = null; // problem: indexing nullable array\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Potential null pointer access: this expression has a '@Nullable' type\n" +
"----------\n");
}
// bug 392862 - [1.8][compiler][null] Evaluate null annotations on array types
// annotation on intermediate type in 2-dim array
public void testArrayType_04() {
runNegativeTestWithLibs(
new String[] {
"A.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class A {\n" +
" void outer(String [] @NonNull[] realArrays, String [] @Nullable[] maybeArrays) {\n" +
" @NonNull Object array;\n" +
" array = realArrays; // problem: unchecked conversion\n" +
" realArrays = null; // no problem, outer array is unspecified\n" +
" array = maybeArrays; // problem: unchecked conversion\n" +
" maybeArrays = null; // no problem\n" +
" }\n" +
" void inner(String [] @NonNull[] realArrays, String [] @Nullable[] maybeArrays) {\n" +
" @NonNull Object array;\n" +
" array = realArrays[0]; // no problem\n" +
" realArrays[0] = null; // problem: cannot assign null to @NonNull array\n" +
" array = maybeArrays[0]; // problem: element can be null\n" +
" maybeArrays[0] = null; // no problem\n" +
" }\n" +
" void leaf(String [] @NonNull[] realArrays, String [] @Nullable[] maybeArrays) {\n" +
" @NonNull Object array;\n" +
" array = realArrays[0][0]; // problem: unchecked conversion\n" +
" realArrays[0][0] = null; // no problem, element type is unspecified\n" +
" array = maybeArrays[0][0]; // problems: indexing nullable array & unchecked conversion\n" +
" maybeArrays[0][0] = null; // problem: indexing nullable array\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. WARNING in A.java (at line 5)\n" +
" array = realArrays; // problem: unchecked conversion\n" +
" ^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type 'String [] @NonNull[]' needs unchecked conversion to conform to \'@NonNull Object\'\n" +
"----------\n" +
"2. WARNING in A.java (at line 7)\n" +
" array = maybeArrays; // problem: unchecked conversion\n" +
" ^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type 'String [] @Nullable[]' needs unchecked conversion to conform to \'@NonNull Object\'\n" +
"----------\n" +
"3. ERROR in A.java (at line 13)\n" +
" realArrays[0] = null; // problem: cannot assign null to @NonNull array\n" +
" ^^^^^^^^^^^^^\n" +
"Null type mismatch: required \'String @NonNull[]\' but the provided value is null\n" +
"----------\n" +
"4. ERROR in A.java (at line 14)\n" +
" array = maybeArrays[0]; // problem: element can be null\n" +
" ^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required '@NonNull Object' but this expression has type 'String @Nullable[]'\n" +
"----------\n" +
"5. WARNING in A.java (at line 19)\n" +
" array = realArrays[0][0]; // problem: unchecked conversion\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type 'String' needs unchecked conversion to conform to \'@NonNull Object\'\n" +
"----------\n" +
"6. ERROR in A.java (at line 21)\n" +
" array = maybeArrays[0][0]; // problems: indexing nullable array & unchecked conversion\n" +
" ^^^^^^^^^^^^^^\n" +
"Potential null pointer access: array element may be null\n" +
"----------\n" +
"7. WARNING in A.java (at line 21)\n" +
" array = maybeArrays[0][0]; // problems: indexing nullable array & unchecked conversion\n" +
" ^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type 'String' needs unchecked conversion to conform to \'@NonNull Object\'\n" +
"----------\n" +
"8. ERROR in A.java (at line 22)\n" +
" maybeArrays[0][0] = null; // problem: indexing nullable array\n" +
" ^^^^^^^^^^^^^^\n" +
"Potential null pointer access: array element may be null\n" +
"----------\n");
}
// bug 392862 - [1.8][compiler][null] Evaluate null annotations on array types
// mismatches against outer array type, test display of type annotation in error messages
public void testArrayType_05() {
runNegativeTestWithLibs(
new String[] {
"A.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class A {\n" +
" void outer(String @NonNull[] @NonNull[] realArrays, String @NonNull[] @Nullable[] maybeArrays, String @Nullable[][] unknownArrays) {\n" +
" realArrays[0] = maybeArrays[0]; // problem: inner array can be null\n" +
" realArrays[0] = unknownArrays[0]; // problems: inner array is unspecified, outer can be null\n" +
" }\n" +
" void oneDim(String @Nullable[] maybeStrings, String[] unknownStrings) {\n" +
" String @NonNull[] s = maybeStrings;\n" +
" s = unknownStrings;\n" +
" consume(maybeStrings);\n" +
" consume(unknownStrings);\n" +
" }\n" +
" void consume(String @NonNull[] s) {};\n" +
"}\n"},
"----------\n" +
"1. ERROR in A.java (at line 4)\n" +
" realArrays[0] = maybeArrays[0]; // problem: inner array can be null\n" +
" ^^^^^^^^^^^^^\n" +
"Null type mismatch: required \'String @NonNull[]\' but the provided value is inferred as @Nullable\n" +
"----------\n" +
"2. WARNING in A.java (at line 5)\n" +
" realArrays[0] = unknownArrays[0]; // problems: inner array is unspecified, outer can be null\n" +
" ^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type 'String[]' needs unchecked conversion to conform to \'String @NonNull[]\'\n" +
"----------\n" +
"3. ERROR in A.java (at line 5)\n" +
" realArrays[0] = unknownArrays[0]; // problems: inner array is unspecified, outer can be null\n" +
" ^^^^^^^^^^^^^\n" +
"Potential null pointer access: this expression has a \'@Nullable\' type\n" +
"----------\n" +
"4. ERROR in A.java (at line 8)\n" +
" String @NonNull[] s = maybeStrings;\n" +
" ^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'String @NonNull[]\' but this expression has type \'String @Nullable[]\'\n" +
"----------\n" +
"5. WARNING in A.java (at line 9)\n" +
" s = unknownStrings;\n" +
" ^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String[]\' needs unchecked conversion to conform to \'String @NonNull[]\'\n" +
"----------\n" +
"6. ERROR in A.java (at line 10)\n" +
" consume(maybeStrings);\n" +
" ^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'String @NonNull[]\' but this expression has type \'String @Nullable[]\'\n" +
"----------\n" +
"7. WARNING in A.java (at line 11)\n" +
" consume(unknownStrings);\n" +
" ^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String[]\' needs unchecked conversion to conform to \'String @NonNull[]\'\n" +
"----------\n");
}
// bug 392862 - [1.8][compiler][null] Evaluate null annotations on array types
// more compiler messages
public void testArrayType_10() {
runNegativeTestWithLibs(
new String[] {
"A.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class A {\n" +
" void outer(String @NonNull[] @NonNull[] realArrays, String @NonNull[] @Nullable[] maybeArrays, String @Nullable[][] unknownArrays, String @NonNull[][] mixedArrays) {\n" +
" realArrays = maybeArrays; // problem on inner dimension!\n" +
" realArrays = unknownArrays; // problems on both dimensions\n" +
" maybeArrays = realArrays; // problem on inner dimension\n" +
" unknownArrays = maybeArrays; // no problem: outer @NonNull is compatible to expected @Nullable, inner @Nullable is compatible to inner unspecified\n" +
" realArrays = mixedArrays; // problem on inner\n" +
" maybeArrays = mixedArrays; // problem on inner\n" +
" consume(maybeArrays, mixedArrays, maybeArrays);\n" +
" }\n" +
" void consume(String @NonNull[] @NonNull[] realStrings, String @NonNull[] @Nullable[] maybeArrays, String @Nullable[][] unknownArrays) {\n" +
" }\n" +
"}\n"},
"----------\n" +
"1. ERROR in A.java (at line 4)\n" +
" realArrays = maybeArrays; // problem on inner dimension!\n" +
" ^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'String @NonNull[] @NonNull[]\' but this expression has type \'String @NonNull[] @Nullable[]\'\n" +
"----------\n" +
"2. ERROR in A.java (at line 5)\n" +
" realArrays = unknownArrays; // problems on both dimensions\n" +
" ^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'String @NonNull[] @NonNull[]\' but this expression has type \'String @Nullable[] []\'\n" +
"----------\n" +
"3. ERROR in A.java (at line 6)\n" +
" maybeArrays = realArrays; // problem on inner dimension\n" +
" ^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'String @NonNull[] @Nullable[]\' but this expression has type \'String @NonNull[] @NonNull[]\'\n" +
"----------\n" +
"4. WARNING in A.java (at line 8)\n" +
" realArrays = mixedArrays; // problem on inner\n" +
" ^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String @NonNull[] []\' needs unchecked conversion to conform to \'String @NonNull[] @NonNull[]\'\n" +
"----------\n" +
"5. WARNING in A.java (at line 9)\n" +
" maybeArrays = mixedArrays; // problem on inner\n" +
" ^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String @NonNull[] []\' needs unchecked conversion to conform to \'String @NonNull[] @Nullable[]\'\n" +
"----------\n" +
"6. ERROR in A.java (at line 10)\n" +
" consume(maybeArrays, mixedArrays, maybeArrays);\n" +
" ^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'String @NonNull[] @NonNull[]\' but this expression has type \'String @NonNull[] @Nullable[]\'\n" +
"----------\n" +
"7. WARNING in A.java (at line 10)\n" +
" consume(maybeArrays, mixedArrays, maybeArrays);\n" +
" ^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String @NonNull[] []\' needs unchecked conversion to conform to \'String @NonNull[] @Nullable[]\'\n" +
"----------\n");
}
// combine flow info on outer type with annotation analysis for inners
public void testArrayType_11() {
runNegativeTestWithLibs(
new String[] {
"ArrayTest.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class ArrayTest {\n" +
" \n" +
" @NonNull Object @NonNull[] test1(@NonNull Object @Nullable[] in) {\n" +
" if (in == null) throw new NullPointerException(); \n" +
" return in; // array needs check, element is OK\n" +
" }\n" +
" @NonNull Object @NonNull[] test2(@Nullable Object @Nullable[] in) {\n" +
" if (in == null) throw new NullPointerException(); \n" +
" return in; // array needs check, element is NOK\n" +
" }\n" +
" @NonNull Object @NonNull[]@NonNull[] test3(@NonNull Object @Nullable[][] in) {\n" +
" if (in == null) throw new NullPointerException(); \n" +
" return in; // outer needs check, inner is unchecked, element is OK\n" +
" }\n" +
" @NonNull Object @NonNull[]@NonNull[] test4(@Nullable Object @Nullable[][] in) {\n" +
" if (in == null) throw new NullPointerException(); \n" +
" return in; // outer needs check, inner is unchecked, element is NOK\n" +
" }\n" +
" @NonNull Object @NonNull[]@NonNull[] test5(@NonNull Object @Nullable[]@Nullable[] in) {\n" +
" if (in == null) throw new NullPointerException(); \n" +
" return in; // outer needs check, inner is NOK, element is OK\n" +
" }\n" +
" @NonNull Object @NonNull[]@NonNull[] test6(@NonNull Object @Nullable[]@NonNull[] in) {\n" +
" if (in == null) throw new NullPointerException(); \n" +
" return in; // outer needs check, inner is OK, element is OK\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in ArrayTest.java (at line 11)\n" +
" return in; // array needs check, element is NOK\n" +
" ^^\n" +
"Null type mismatch (type annotations): required \'@NonNull Object @NonNull[]\' but this expression has type \'@Nullable Object @Nullable[]\'\n" +
"----------\n" +
"2. WARNING in ArrayTest.java (at line 15)\n" +
" return in; // outer needs check, inner is unchecked, element is OK\n" +
" ^^\n" +
"Null type safety (type annotations): The expression of type \'@NonNull Object @Nullable[] []\' needs unchecked conversion to conform to \'@NonNull Object @NonNull[] @NonNull[]\'\n" +
"----------\n" +
"3. ERROR in ArrayTest.java (at line 19)\n" +
" return in; // outer needs check, inner is unchecked, element is NOK\n" +
" ^^\n" +
"Null type mismatch (type annotations): required \'@NonNull Object @NonNull[] @NonNull[]\' but this expression has type \'@Nullable Object @Nullable[] []\'\n" +
"----------\n" +
"4. ERROR in ArrayTest.java (at line 23)\n" +
" return in; // outer needs check, inner is NOK, element is OK\n" +
" ^^\n" +
"Null type mismatch (type annotations): required \'@NonNull Object @NonNull[] @NonNull[]\' but this expression has type \'@NonNull Object @Nullable[] @Nullable[]\'\n" +
"----------\n");
}
// https://bugs.eclipse.org/403216 - [1.8][null] TypeReference#captureTypeAnnotations treats type annotations as type argument annotations
public void testBug403216_1() {
runConformTestWithLibs(
new String[] {
"Test.java",
"import java.lang.annotation.ElementType;\n" +
"import java.lang.annotation.Target;\n" +
"\n" +
"public class Test {}\n" +
"\n" +
"class X {\n" +
" class Y {\n" +
" public void foo( @A X. @B Y this) {}\n" +
" }\n" +
"}\n" +
"@Target(value={ElementType.TYPE_USE})\n" +
"@interface A {}\n" +
"@Target(value={ElementType.TYPE_USE})\n" +
"@interface B {}\n"
},
null,
"");
}
// issue from https://bugs.eclipse.org/bugs/show_bug.cgi?id=403216#c7
public void testBug403216_2() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"public class X {\n" +
" void test(List<@NonNull String> strings) {\n" +
" List<String> someStrings;\n" +
" someStrings = strings;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=403216#c9
public void testBug403216_3a() {
runNegativeTestWithLibs(
new String[] {
"Test.java",
"import java.lang.annotation.ElementType;\n" +
"import java.lang.annotation.Target;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class Test {}\n" +
"\n" +
"class X {\n" +
" class Y {\n" +
" public void foo( @A X. @NonNull Y this) {}\n" +
" }\n" +
"}\n" +
"@Target(value={ElementType.TYPE_USE})\n" +
"@interface A {}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Test.java (at line 9)\n" +
" public void foo( @A X. @NonNull Y this) {}\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Nullness annotations are not applicable at this location \n" +
"----------\n");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=403216#c9
public void testBug403216_3b() {
runConformTestWithLibs(
new String[] {
"Test.java",
"import java.lang.annotation.ElementType;\n" +
"import java.lang.annotation.Target;\n" +
"\n" +
"public class Test {}\n" +
"\n" +
"class X {\n" +
" class Y {\n" +
" public void foo( @A X. @A Y this) {}\n" +
" }\n" +
"}\n" +
"@Target(value={ElementType.TYPE_USE})\n" +
"@interface A {}\n"
},
getCompilerOptions(),
"");
}
// https://bugs.eclipse.org/403457 - [1.8][compiler] NPE in WildcardBinding.signature
public void testBug403457_1() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.lang.annotation.ElementType;\n" +
"import java.lang.annotation.Target;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class X {\n" +
" void foo(Map<@Marker ? super @Marker Object, @Marker ? extends @Marker String> m){}\n" +
" void goo(Map<@Marker ? extends @Marker Object, @Marker ? super @Marker String> m){}\n" +
"}\n" +
"\n" +
"@Target(ElementType.TYPE_USE)\n" +
"@interface Marker {\n" +
" \n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 6)\n" +
" void foo(Map<@Marker ? super @Marker Object, @Marker ? extends @Marker String> m){}\n" +
" ^^^\n" +
"Map cannot be resolved to a type\n" +
"----------\n" +
"2. ERROR in X.java (at line 7)\n" +
" void goo(Map<@Marker ? extends @Marker Object, @Marker ? super @Marker String> m){}\n" +
" ^^^\n" +
"Map cannot be resolved to a type\n" +
"----------\n");
}
// https://bugs.eclipse.org/403457 - [1.8][compiler] NPE in WildcardBinding.signature
// variant with null annotations
public void testBug403457_2() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"// import java.util.Map;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class X {\n" +
" void foo(Map<@Nullable ? super @Nullable Object, @Nullable ? extends @Nullable String> m){}\n" +
" void goo(Map<@Nullable ? extends @Nullable Object, @Nullable ? super @Nullable String> m){}\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 5)\n" +
" void foo(Map<@Nullable ? super @Nullable Object, @Nullable ? extends @Nullable String> m){}\n" +
" ^^^\n" +
"Map cannot be resolved to a type\n" +
"----------\n" +
"2. ERROR in X.java (at line 6)\n" +
" void goo(Map<@Nullable ? extends @Nullable Object, @Nullable ? super @Nullable String> m){}\n" +
" ^^^\n" +
"Map cannot be resolved to a type\n" +
"----------\n");
}
// storing and decoding null-type-annotations to/from classfile: RETURN_TYPE
public void testBinary01() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_PB_POTENTIAL_NULL_REFERENCE, JavaCore.ERROR);
runConformTestWithLibs(
new String[] {
"p/X.java",
"package p;\n" +
"import java.util.List;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" public List<@Nullable String> getSomeStrings() { return null; }\n" +
"}\n"
},
customOptions,
"");
runNegativeTestWithLibs(
new String[] {
"Y.java",
"import p.X;\n" +
"public class Y {\n" +
" public void test(X x) {\n" +
" String s0 = x.getSomeStrings().get(0);\n" +
" System.out.println(s0.toUpperCase());\n" +
" }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in Y.java (at line 5)\n" +
" System.out.println(s0.toUpperCase());\n" +
" ^^\n" +
"Potential null pointer access: The variable s0 may be null at this location\n" +
"----------\n"
);
}
// storing and decoding null-type-annotations to/from classfile: METHOD_FORMAL_PARAMETER & METHOD_RECEIVER
// Note: receiver annotation is not evaluated by the compiler, this part of the test only serves debugging purposes.
public void testBinary02() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_PB_POTENTIAL_NULL_REFERENCE, JavaCore.ERROR);
runConformTestWithLibs(
new String[] {
"p/X.java",
"package p;\n" +
"import java.util.List;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"import static java.lang.annotation.ElementType.*;\n" +
"import java.lang.annotation.*;\n" +
"@Retention(RetentionPolicy.CLASS)\n" +
"@Target(TYPE_USE)\n" +
"@interface Immutable {}\n" +
"public class X {\n" +
" public void setAllStrings(@Immutable X this, int dummy, List<@NonNull String> ss) { }\n" +
"}\n"
},
customOptions,
"");
runNegativeTestWithLibs(
new String[] {
"Y.java",
"import p.X;\n" +
"import java.util.List;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public class Y {\n" +
" public void test(X x, List<@Nullable String> ss) {\n" +
" x.setAllStrings(-1, ss);\n" +
" }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in Y.java (at line 6)\n" +
" x.setAllStrings(-1, ss);\n" +
" ^^\n" +
"Null type mismatch (type annotations): required \'List<@NonNull String>\' but this expression has type \'List<@Nullable String>\'\n" +
"----------\n"
);
}
// storing and decoding null-type-annotations to/from classfile: FIELD
public void testBinary03() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_PB_POTENTIAL_NULL_REFERENCE, JavaCore.ERROR);
customOptions.put(JavaCore.COMPILER_PB_MISSING_SERIAL_VERSION, JavaCore.IGNORE);
runConformTestWithLibs(
new String[] {
"p/X1.java",
"package p;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public abstract class X1 {\n" +
" public static String @Nullable [] f1 = null;\n" +
" public static String [] @Nullable [] f2 = new String[] @Nullable[] { null };\n" +
"}\n"
},
customOptions,
"");
runNegativeTestWithLibs(
new String[] {
"Y1.java",
"import p.X1;\n" +
"public class Y1 {\n" +
" public void test() {\n" +
" System.out.println(p.X1.f1.length);\n" +
" System.out.println(X1.f2[0].length);\n" +
" }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in Y1.java (at line 4)\n" +
" System.out.println(p.X1.f1.length);\n" +
" ^^\n" +
"Potential null pointer access: this expression has a '@Nullable' type\n" +
"----------\n" +
"2. ERROR in Y1.java (at line 5)\n" +
" System.out.println(X1.f2[0].length);\n" +
" ^^^^^^^^\n" +
"Potential null pointer access: array element may be null\n" +
"----------\n"
);
}
// storing and decoding null-type-annotations to/from classfile: SUPER_TYPE
public void testBinary04() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_PB_POTENTIAL_NULL_REFERENCE, JavaCore.ERROR);
customOptions.put(JavaCore.COMPILER_PB_MISSING_SERIAL_VERSION, JavaCore.IGNORE);
runConformTestWithLibs(
new String[] {
"p/X1.java",
"package p;\n" +
"import java.util.ArrayList;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public abstract class X1 extends ArrayList<@Nullable String> {\n" +
"}\n",
"p/X2.java",
"package p;\n" +
"import java.util.List;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public abstract class X2 implements List<@Nullable String> {\n" +
"}\n"
},
customOptions,
"");
runNegativeTestWithLibs(
new String[] {
"Y1.java",
"import p.X1;\n" +
"public class Y1 {\n" +
" public void test(X1 x) {\n" +
" String s0 = x.get(0);\n" +
" System.out.println(s0.toUpperCase());\n" +
" }\n" +
"}\n",
"Y2.java",
"import p.X2;\n" +
"public class Y2 {\n" +
" public void test(X2 x) {\n" +
" String s0 = x.get(0);\n" +
" System.out.println(s0.toUpperCase());\n" +
" }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in Y1.java (at line 5)\n" +
" System.out.println(s0.toUpperCase());\n" +
" ^^\n" +
"Potential null pointer access: The variable s0 may be null at this location\n" +
"----------\n" +
"----------\n" +
"1. ERROR in Y2.java (at line 5)\n" +
" System.out.println(s0.toUpperCase());\n" +
" ^^\n" +
"Potential null pointer access: The variable s0 may be null at this location\n" +
"----------\n"
);
}
// storing and decoding null-type-annotations to/from classfile: CLASS_TYPE_PARAMETER & METHOD_TYPE_PARAMETER
public void testBinary05() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_PB_POTENTIAL_NULL_REFERENCE, JavaCore.ERROR);
customOptions.put(JavaCore.COMPILER_PB_MISSING_SERIAL_VERSION, JavaCore.IGNORE);
runConformTestWithLibs(
new String[] {
"p/X1.java",
"package p;\n" +
"import java.util.ArrayList;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public abstract class X1<@NonNull T> extends ArrayList<T> {\n" +
" public <@Nullable S> void foo(S s) {}\n" +
"}\n"
},
customOptions,
"");
runNegativeTestWithLibs(
new String[] {
"Y1.java",
"import p.X1;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public class Y1 {\n" +
" X1<@Nullable String> maybeStrings;\n" + // incompatible: T is constrained to @NonNull
" void test(X1<@NonNull String> x) {\n" + // OK
" x.<@NonNull Object>foo(new Object());\n" + // incompatible: S is constrained to @Nullable
" }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in Y1.java (at line 4)\n" +
" X1<@Nullable String> maybeStrings;\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@Nullable String\' is not a valid substitute for the type parameter \'@NonNull T extends Object\'\n" +
"----------\n" +
"2. ERROR in Y1.java (at line 6)\n" +
" x.<@NonNull Object>foo(new Object());\n" +
" ^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@NonNull Object\' is not a valid substitute for the type parameter \'@Nullable S extends Object\'\n" +
"----------\n");
}
// storing and decoding null-type-annotations to/from classfile: CLASS_TYPE_PARAMETER_BOUND & METHOD_TYPE_PARAMETER_BOUND
public void testBinary06() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_PB_POTENTIAL_NULL_REFERENCE, JavaCore.ERROR);
customOptions.put(JavaCore.COMPILER_PB_MISSING_SERIAL_VERSION, JavaCore.IGNORE);
runNegativeTestWithLibs(
new String[] {
"p/X1.java",
"package p;\n" +
"import java.util.ArrayList;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public abstract class X1<T extends @NonNull Object> extends ArrayList<T> {\n" +
" public <U, V extends @Nullable Object> void foo(U u, V v) {}\n" +
"}\n",
"p/X2.java",
"package p;\n"+
"import org.eclipse.jdt.annotation.*;\n" +
"public class X2<@NonNull W extends @Nullable Object> {}\n" // incompatible constraints
},
customOptions,
"----------\n" +
"1. ERROR in p\\X2.java (at line 3)\n" +
" public class X2<@NonNull W extends @Nullable Object> {}\n" +
" ^^^^^^^^^\n" +
"This nullness annotation conflicts with a \'@NonNull\' annotation which is effective on the same type parameter \n" +
"----------\n");
// fix the bug:
runConformTestWithLibs(
new String[] {
"p/X1.java",
"package p;\n" +
"import java.util.ArrayList;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public abstract class X1<T extends @NonNull Object> extends ArrayList<T> {\n" +
" public <U, V extends @Nullable Object> void foo(U u, V v) {}\n" +
"}\n",
"p/X2.java",
"package p;\n"+
"import org.eclipse.jdt.annotation.*;\n" +
"public class X2<@Nullable W extends Object> {}\n"
},
customOptions,
"");
runNegativeTestWithLibs(
new String[] {
"Y1.java",
"import p.X1;\n" +
"import p.X2;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public class Y1 {\n" +
" X1<@Nullable String> maybeStrings;\n" + // incompatible: T has a bound constrained to @NonNull
" X2<@NonNull String> strings;\n" + // incompatible: W is constrained to @Nullable
" void test(X1<@NonNull String> x) {\n" + // OK
" x.<Y1, @NonNull Object>foo(this, new Object());\n" + // incompatible: V is constrained to @Nullable via superclass
" }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in Y1.java (at line 5)\n" +
" X1<@Nullable String> maybeStrings;\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@Nullable String\' is not a valid substitute for the type parameter \'T extends @NonNull Object\'\n" +
"----------\n" +
"2. ERROR in Y1.java (at line 6)\n" +
" X2<@NonNull String> strings;\n" +
" ^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@NonNull String\' is not a valid substitute for the type parameter \'@Nullable W extends Object\'\n" +
"----------\n" +
"3. ERROR in Y1.java (at line 8)\n" +
" x.<Y1, @NonNull Object>foo(this, new Object());\n" +
" ^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@NonNull Object\' is not a valid substitute for the type parameter \'V extends @Nullable Object'\n" +
"----------\n"
);
}
// storing and decoding null-type-annotations to/from classfile: CLASS_TYPE_PARAMETER_BOUND & METHOD_TYPE_PARAMETER_BOUND
// variant: qualified type references
public void testBinary06b() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_PB_POTENTIAL_NULL_REFERENCE, JavaCore.ERROR);
customOptions.put(JavaCore.COMPILER_PB_MISSING_SERIAL_VERSION, JavaCore.IGNORE);
runNegativeTestWithLibs(
new String[] {
"p/X1.java",
"package p;\n" +
"import java.util.ArrayList;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public abstract class X1<T extends java.lang.@NonNull Object> extends ArrayList<T> {\n" +
" public <U, V extends java.lang.@Nullable Object> void foo(U u, V v) {}\n" +
"}\n",
"p/X2.java",
"package p;\n"+
"import org.eclipse.jdt.annotation.*;\n" +
"public class X2<@NonNull W extends java.lang.@Nullable Object> {}\n" // incompatible constraints
},
customOptions,
"----------\n" +
"1. ERROR in p\\X2.java (at line 3)\n" +
" public class X2<@NonNull W extends java.lang.@Nullable Object> {}\n" +
" ^^^^^^^^^\n" +
"This nullness annotation conflicts with a \'@NonNull\' annotation which is effective on the same type parameter \n" +
"----------\n");
// fix the bug:
runConformTestWithLibs(
new String[] {
"p/X1.java",
"package p;\n" +
"import java.util.ArrayList;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public abstract class X1<T extends java.lang.@NonNull Object> extends ArrayList<T> {\n" +
" public <U, V extends java.lang.@Nullable Object> void foo(U u, V v) {}\n" +
"}\n",
"p/X2.java",
"package p;\n"+
"import org.eclipse.jdt.annotation.*;\n" +
"public class X2<@Nullable W extends Object> {}\n"
},
customOptions,
"");
runNegativeTestWithLibs(
new String[] {
"Y1.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class Y1 {\n" +
" p.X1<java.lang.@Nullable String> maybeStrings;\n" + // incompatible: T has a bound constrained to @NonNull
" p.X2<java.lang.@NonNull String> strings;\n" + // incompatible: W is constrained to @Nullable
" void test(p.X1<java.lang.@NonNull String> x) {\n" + // OK
" x.<Y1, java.lang.@NonNull Object>foo(this, new Object());\n" + // incompatible: V is constrained to @Nullable via superclass
" }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in Y1.java (at line 3)\n" +
" p.X1<java.lang.@Nullable String> maybeStrings;\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@Nullable String\' is not a valid substitute for the type parameter \'T extends @NonNull Object\'\n" +
"----------\n" +
"2. ERROR in Y1.java (at line 4)\n" +
" p.X2<java.lang.@NonNull String> strings;\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@NonNull String\' is not a valid substitute for the type parameter \'@Nullable W extends Object\'\n" +
"----------\n" +
"3. ERROR in Y1.java (at line 6)\n" +
" x.<Y1, java.lang.@NonNull Object>foo(this, new Object());\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@NonNull Object\' is not a valid substitute for the type parameter \'V extends @Nullable Object\'\n" +
"----------\n"
);
}
// storing and decoding null-type-annotations to/from classfile: method with all kinds of type annotations
public void testBinary07() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_PB_POTENTIAL_NULL_REFERENCE, JavaCore.ERROR);
customOptions.put(JavaCore.COMPILER_PB_MISSING_SERIAL_VERSION, JavaCore.IGNORE);
runConformTestWithLibs(
new String[] {
"p/X1.java",
"package p;\n" +
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"import static java.lang.annotation.ElementType.*;\n" +
"import java.lang.annotation.*;\n" +
"@Retention(RetentionPolicy.CLASS)\n" +
"@Target(TYPE_USE)\n" +
"@interface Immutable {}\n" +
"public abstract class X1 {\n" +
" public <@NonNull U, V extends @Nullable Object> List<@NonNull Map<Object, @NonNull String>> foo(@Immutable X1 this, U u, V v) { return null; }\n" +
"}\n"
},
customOptions,
"");
runNegativeTestWithLibs(
new String[] {
"Y1.java",
"import p.X1;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public class Y1 {\n" +
" void test(X1 x) {\n" +
" x.<@NonNull Y1, @NonNull Object>foo(this, new Object())\n" + // @NonNull Object conflicts with "V extends @Nullable Object"
" .get(0).put(null, null);\n" + // second null is illegal
" }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in Y1.java (at line 5)\n" +
" x.<@NonNull Y1, @NonNull Object>foo(this, new Object())\n" +
" ^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@NonNull Object\' is not a valid substitute for the type parameter \'V extends @Nullable Object\'\n" +
"----------\n" +
"2. ERROR in Y1.java (at line 6)\n" +
" .get(0).put(null, null);\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n");
}
// storing and decoding null-type-annotations to/from classfile: details
public void testBinary08() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_PB_POTENTIAL_NULL_REFERENCE, JavaCore.ERROR);
customOptions.put(JavaCore.COMPILER_PB_MISSING_SERIAL_VERSION, JavaCore.IGNORE);
runNegativeTestWithLibs(
new String[] {
"p/X1.java",
"package p;\n" +
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public abstract class X1 {\n" +
" public class Inner {}\n" +
" public Object []@NonNull[] arrays(Object @NonNull[][] oa1) { return null; }\n" +
" public void nesting(@NonNull Inner i1, X1.@Nullable Inner i2) { }\n" +
" public void wildcard1(List<@Nullable ? extends @NonNull X1> l) { } // contradiction\n" +
" public void wildcard2(List<? super @NonNull X1> l) { }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in p\\X1.java (at line 8)\n" +
" public void wildcard1(List<@Nullable ? extends @NonNull X1> l) { } // contradiction\n" +
" ^^^^^^^^\n" +
"This nullness annotation conflicts with a \'@Nullable\' annotation which is effective on the same type parameter \n" +
"----------\n");
// fix the error:
runConformTestWithLibs(
new String[] {
"p/X1.java",
"package p;\n" +
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public abstract class X1 {\n" +
" public class Inner {}\n" +
" public Object []@NonNull[] arrays(Object @NonNull[][] oa1) { return null; }\n" +
" public void nesting(@NonNull Inner i1, X1.@Nullable Inner i2) { }\n" +
" public void wildcard1(List<@Nullable ? extends X1> l) { }\n" +
" public void wildcard2(List<? super @NonNull X1> l) { }\n" +
"}\n"
},
customOptions,
"");
runNegativeTestWithLibs(
new String[] {
"Y1.java",
"import p.X1;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"public class Y1 {\n" +
" void test(X1 x) {\n" +
" Object @NonNull[][] a = new Object[0][]; // safe: new is never null\n" +
" x.arrays(a)[0] = null; // illegal\n" +
" x.nesting(null, null); // 1st null is illegal\n" +
" x.wildcard2(new ArrayList<@NonNull Object>());\n" +
" x.wildcard2(new ArrayList<@Nullable Object>()); // OK\n" +
" x.wildcard1(new ArrayList<@NonNull X1>()); // incompatible\n" +
" }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in Y1.java (at line 7)\n" +
" x.arrays(a)[0] = null; // illegal\n" +
" ^^^^^^^^^^^^^^\n" +
"Null type mismatch: required \'Object @NonNull[]\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in Y1.java (at line 8)\n" +
" x.nesting(null, null); // 1st null is illegal\n" +
" ^^^^\n" +
"Null type mismatch: required \'X1.@NonNull Inner\' but the provided value is null\n" +
"----------\n" +
"3. ERROR in Y1.java (at line 11)\n" +
" x.wildcard1(new ArrayList<@NonNull X1>()); // incompatible\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'List<@Nullable ? extends X1>\' but this expression has type \'ArrayList<@NonNull X1>\', corresponding supertype is \'List<@NonNull X1>\'\n" +
"----------\n");
}
// storing and decoding null-type-annotations to/from classfile: details
// variant: qualified references
public void testBinary08b() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_PB_POTENTIAL_NULL_REFERENCE, JavaCore.ERROR);
customOptions.put(JavaCore.COMPILER_PB_MISSING_SERIAL_VERSION, JavaCore.IGNORE);
runNegativeTestWithLibs(
new String[] {
"p/X1.java",
"package p;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public abstract class X1 {\n" +
" public class Inner {}\n" +
" public java.lang.Object []@NonNull[] arrays(java.lang.Object @NonNull[][] oa1) { return null; }\n" +
" public void nesting(@NonNull Inner i1, X1.@Nullable Inner i2) { }\n" +
" public void wildcard1(java.util.List<@Nullable ? extends p.@NonNull X1> l) { } // contradiction\n" +
" public void wildcard2(java.util.List<? super p.@NonNull X1> l) { }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in p\\X1.java (at line 7)\n" +
" public void wildcard1(java.util.List<@Nullable ? extends p.@NonNull X1> l) { } // contradiction\n" +
" ^^^^^^^^\n" +
"This nullness annotation conflicts with a \'@Nullable\' annotation which is effective on the same type parameter \n" +
"----------\n");
// fix the error:
runConformTestWithLibs(
new String[] {
"p/X1.java",
"package p;\n" +
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public abstract class X1 {\n" +
" public class Inner {}\n" +
" public java.lang.Object []@NonNull[] arrays(java.lang.Object @NonNull[][] oa1) { return null; }\n" +
" public void nesting(@NonNull Inner i1, p.X1.@Nullable Inner i2) { }\n" +
" public void wildcard1(List<@Nullable ? extends p.X1> l) { }\n" +
" public void wildcard2(List<? super p.@NonNull X1> l) { }\n" +
"}\n"
},
customOptions,
"");
runNegativeTestWithLibs(
new String[] {
"Y1.java",
"import p.X1;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"public class Y1 {\n" +
" void test(X1 x) {\n" +
" java.lang.Object @NonNull[][] a = new java.lang.Object[0][]; // safe: new is never null\n" +
" x.arrays(a)[0] = null; // illegal\n" +
" x.nesting(null, null); // 1st null is illegal\n" +
" x.wildcard2(new ArrayList<java.lang.@NonNull Object>());\n" +
" x.wildcard2(new ArrayList<java.lang.@Nullable Object>());\n" +
" x.wildcard1(new ArrayList<p.@NonNull X1>()); // incompatible\n" +
" }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in Y1.java (at line 7)\n" +
" x.arrays(a)[0] = null; // illegal\n" +
" ^^^^^^^^^^^^^^\n" +
"Null type mismatch: required \'Object @NonNull[]\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in Y1.java (at line 8)\n" +
" x.nesting(null, null); // 1st null is illegal\n" +
" ^^^^\n" +
"Null type mismatch: required \'X1.@NonNull Inner\' but the provided value is null\n" +
"----------\n" +
"3. ERROR in Y1.java (at line 11)\n" +
" x.wildcard1(new ArrayList<p.@NonNull X1>()); // incompatible\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'List<@Nullable ? extends X1>\' but this expression has type \'ArrayList<@NonNull X1>\', corresponding supertype is \'List<@NonNull X1>\'\n" +
"----------\n");
}
// storing and decoding null-type-annotations to/from classfile: EXTENDED DIMENSIONS.
public void testBinary09() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_PB_POTENTIAL_NULL_REFERENCE, JavaCore.ERROR);
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"public class X {\n" +
" @NonNull String @Nullable [] f @NonNull [] = null;\n" +
" static void foo(@NonNull String @Nullable [] p @NonNull []) {\n" +
" p = null;\n" +
" @NonNull String @Nullable [] l @NonNull [] = null;\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" @NonNull String @Nullable [] f @NonNull [] = null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String @NonNull[] @Nullable[]\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in X.java (at line 6)\n" +
" p = null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String @NonNull[] @Nullable[]\' but the provided value is null\n" +
"----------\n" +
"3. ERROR in X.java (at line 7)\n" +
" @NonNull String @Nullable [] l @NonNull [] = null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String @NonNull[] @Nullable[]\' but the provided value is null\n" +
"----------\n");
// fix the error:
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"public class X {\n" +
" @NonNull String @Nullable [] f @NonNull [] = new @NonNull String @NonNull [0] @Nullable [];\n" +
"}\n"
},
customOptions,
"");
runNegativeTestWithLibs(
new String[] {
"Y.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class Y {\n" +
" void test(X x) {\n" +
" x.f = null;\n" +
" x.f[0] = null;\n" +
" x.f[0][0] = null;\n" +
" }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. WARNING in Y.java (at line 1)\n" +
" import org.eclipse.jdt.annotation.*;\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"The import org.eclipse.jdt.annotation is never used\n" +
"----------\n" +
"2. ERROR in Y.java (at line 4)\n" +
" x.f = null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String @NonNull[] @Nullable[]\' but the provided value is null\n" +
"----------\n" +
"3. ERROR in Y.java (at line 6)\n" +
" x.f[0][0] = null;\n" +
" ^^^^^^\n" +
"Potential null pointer access: array element may be null\n" +
"----------\n" +
"4. ERROR in Y.java (at line 6)\n" +
" x.f[0][0] = null;\n" +
" ^^^^^^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n");
}
// storing and decoding null-type-annotations to/from classfile: array annotations.
public void testBinary10() {
Map customOptions = getCompilerOptions();
customOptions.put(JavaCore.COMPILER_PB_POTENTIAL_NULL_REFERENCE, JavaCore.ERROR);
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.util.ArrayList;\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"public class X {\n" +
" void foo(ArrayList<String> @NonNull [] p) {\n" +
" }\n" +
"}\n" +
"class Y extends X {\n" +
" void foo() {\n" +
" super.foo(null);\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 9)\n" +
" super.foo(null);\n" +
" ^^^^\n" +
"Null type mismatch: required \'ArrayList<String> @NonNull[]\' but the provided value is null\n" +
"----------\n");
// fix the error:
runConformTestWithLibs(
new String[] {
"X.java",
"import java.util.ArrayList;\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"public class X {\n" +
" void foo(ArrayList<String> @NonNull [] p) {\n" +
" }\n" +
"}\n"
},
customOptions,
"");
runNegativeTestWithLibs(
new String[] {
"Y.java",
"public class Y extends X {\n" +
" void foo() {\n" +
" super.foo(null);\n" +
" }\n" +
"}\n"
},
customOptions,
"----------\n" +
"1. ERROR in Y.java (at line 3)\n" +
" super.foo(null);\n" +
" ^^^^\n" +
"Null type mismatch: required \'ArrayList<String> @NonNull[]\' but the provided value is null\n" +
"----------\n");
}
public void testConditional1() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n"
+ "import java.util.*;\n"
+ "public class X {\n"
+ " List<@NonNull String> foo(List<@NonNull String> good, List<String> dubious, int f) {\n"
+ " if (f < 2)\n"
+ " return f == 0 ? good : dubious;\n"
+ " if (f < 4)\n"
+ " return f == 2 ? dubious : good;\n"
+ " if (f < 6)\n"
+ " return f == 4 ? good : good;\n"
+ " return null;\n"
+ " }\n"
+ "}\n"
},
"----------\n" +
"1. WARNING in X.java (at line 6)\n" +
" return f == 0 ? good : dubious;\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'List<String>\' needs unchecked conversion to conform to \'List<@NonNull String>\'\n" +
"----------\n" +
"2. WARNING in X.java (at line 8)\n" +
" return f == 2 ? dubious : good;\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'List<String>\' needs unchecked conversion to conform to \'List<@NonNull String>\'\n" +
"----------\n");
}
public void testConditional2() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n"
+ "import java.util.*;\n"
+ "public class X {\n"
+ " List<@NonNull String> foo(List<@NonNull String> good, ArrayList<String> dubious, int f) {\n"
+ " if (f < 2)\n"
+ " return f == 0 ? good : dubious;\n"
+ " if (f < 4)\n"
+ " return f == 2 ? dubious : good;\n"
+ " if (f < 6)\n"
+ " return f == 4 ? good : good;\n"
+ " return null;\n"
+ " }\n"
+ "}\n"
},
"----------\n" +
"1. WARNING in X.java (at line 6)\n" +
" return f == 0 ? good : dubious;\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'ArrayList<String>\' needs unchecked conversion to conform to \'List<@NonNull String>\', corresponding supertype is 'List<String>'\n" +
"----------\n" +
"2. WARNING in X.java (at line 8)\n" +
" return f == 2 ? dubious : good;\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'ArrayList<String>\' needs unchecked conversion to conform to \'List<@NonNull String>\', corresponding supertype is 'List<String>'\n" +
"----------\n");
}
// conditional in argument position
public void testConditional3() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n"
+ "import java.util.*;\n"
+ "public class X {\n"
+ " void foo(List<@NonNull String> good, List<String> dubious, int f) {\n"
+ " consume(f == 0 ? good : dubious);\n"
+ " consume(f == 2 ? dubious : good);\n"
+ " consume(f == 4 ? good : good);\n"
+ " }\n" +
" void consume(List<@NonNull String> strings) {}\n"
+ "}\n"
},
"----------\n" +
"1. WARNING in X.java (at line 5)\n" +
" consume(f == 0 ? good : dubious);\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'List<String>\' needs unchecked conversion to conform to \'List<@NonNull String>\'\n" +
"----------\n" +
"2. WARNING in X.java (at line 6)\n" +
" consume(f == 2 ? dubious : good);\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'List<String>\' needs unchecked conversion to conform to \'List<@NonNull String>\'\n" +
"----------\n");
}
// types with null annotations on details (type parameter) are compatible to equal types
public void testCompatibility1() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n"
+ "import java.util.*;\n"
+ "public class X {\n"
+ " List<@NonNull String> return1(List<@NonNull String> noNulls) {\n"
+ " return noNulls;\n"
+ " }\n"
+ " List<@Nullable String> return2(List<@Nullable String> withNulls) {\n"
+ " return withNulls;\n"
+ " }\n"
+ " void assigns(List<@NonNull String> noNulls, List<String> dubious, List<@Nullable String> withNulls) {\n"
+ " List<@NonNull String> l1 = noNulls;\n"
+ " List<@Nullable String> l2 = withNulls;\n"
+ " List<String> l3 = dubious;\n"
+ " }\n"
+ " void arguments(List<@NonNull String> noNulls, List<String> dubious, List<@Nullable String> withNulls) {\n"
+ " assigns(noNulls, dubious, withNulls);\n"
+ " }\n"
+ "}\n"
},
getCompilerOptions(),
"");
}
// types with null annotations on details (array content) are compatible to equal types
public void testCompatibility1a() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n"
+ "public class X {\n"
+ " @NonNull String[] return1(@NonNull String[] noNulls) {\n"
+ " return noNulls;\n"
+ " }\n"
+ " @Nullable String[] return2(@Nullable String[] noNulls) {\n"
+ " return noNulls;\n"
+ " }\n"
+ " void assigns(@NonNull String[] noNulls, String dubious[], @Nullable String[] withNulls) {\n"
+ " @NonNull String[] l1 = noNulls;\n"
+ " @Nullable String[] l2 = withNulls;\n"
+ " String[] l3 = dubious;\n"
+ " }\n"
+ " void arguments(@NonNull String[] noNulls, String[] dubious, @Nullable String[] withNulls) {\n"
+ " assigns(noNulls, dubious, withNulls);\n"
+ " }\n"
+ "}\n"
},
getCompilerOptions(),
"");
}
// types with null annotations on details (type parameter) are compatible to types lacking the annotation
public void testCompatibility2() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n"
+ "import java.util.*;\n"
+ "public class X {\n"
+ " List<String> return1(List<@NonNull String> noNulls) {\n"
+ " return noNulls;\n"
+ " }\n"
+ " List<String> return2(List<String> dubious) {\n"
+ " return dubious;\n"
+ " }\n"
+ " List<String> return3(List<@Nullable String> withNulls) {\n"
+ " return withNulls;\n"
+ " }\n"
+ " void assigns(List<@NonNull String> noNulls, List<String> dubious, List<@Nullable String> withNulls) {\n"
+ " List<String> l1 = noNulls;\n"
+ " List<String> l2 = dubious;\n"
+ " List<String> l3 = withNulls;\n"
+ " }\n"
+ " void arguments(List<@NonNull String> noNulls, List<String> dubious, List<@Nullable String> withNulls) {\n"
+ " takeAny(noNulls);\n"
+ " takeAny(dubious);\n"
+ " takeAny(withNulls);\n"
+ " }\n"
+ " void takeAny(List<String> any) {}\n"
+ "}\n"
},
getCompilerOptions(),
"");
}
// types with null annotations on details (array content) are compatible to types lacking the annotation
public void testCompatibility2a() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n"
+ "public class X {\n"
+ " String[] return1(@NonNull String[] noNulls) {\n"
+ " return noNulls;\n"
+ " }\n"
+ " String[] return2(String[] dubious) {\n"
+ " return dubious;\n"
+ " }\n"
+ " String[] return3(@Nullable String[] withNulls) {\n"
+ " return withNulls;\n"
+ " }\n"
+ " void assigns(@NonNull String[] noNulls, String[] dubious, @Nullable String[] withNulls) {\n"
+ " String[] l1 = noNulls;\n"
+ " String[] l2 = dubious;\n"
+ " String[] l3 = withNulls;\n"
+ " }\n"
+ " void arguments(@NonNull String[] noNulls, String[] dubious, @Nullable String[] withNulls) {\n"
+ " takeAny(noNulls);\n"
+ " takeAny(dubious);\n"
+ " takeAny(withNulls);\n"
+ " }\n"
+ " void takeAny(String[] any) {}\n"
+ "}\n"
},
getCompilerOptions(),
"");
}
// types without null annotations are converted (unsafe) to types with detail annotations (type parameter)
public void testCompatibility3() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n"
+ "import java.util.*;\n"
+ "public class X {\n"
+ " List<@NonNull String> return1(List<String> dubious) {\n"
+ " return dubious;\n"
+ " }\n"
+ " List<@Nullable String> return2(List<String> dubious) {\n"
+ " return dubious;\n"
+ " }\n"
+ " void assigns(List<String> dubious) {\n"
+ " List<@Nullable String> l1 = dubious;\n"
+ " List<@NonNull String> l2 = dubious;\n"
+ " }\n"
+ " void arguments(List<String> dubious) {\n"
+ " acceptNulls(dubious);\n"
+ " acceptNoNulls(dubious);\n"
+ " }\n"
+ " void acceptNulls(List<@NonNull String> noNulls) {}\n"
+ " void acceptNoNulls(List<@NonNull String> noNulls) {}\n"
+ "}\n"
},
"----------\n" +
"1. WARNING in X.java (at line 5)\n" +
" return dubious;\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'List<String>\' needs unchecked conversion to conform to \'List<@NonNull String>\'\n" +
"----------\n" +
"2. WARNING in X.java (at line 8)\n" +
" return dubious;\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'List<String>\' needs unchecked conversion to conform to \'List<@Nullable String>\'\n" +
"----------\n" +
"3. WARNING in X.java (at line 11)\n" +
" List<@Nullable String> l1 = dubious;\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'List<String>\' needs unchecked conversion to conform to \'List<@Nullable String>\'\n" +
"----------\n" +
"4. WARNING in X.java (at line 12)\n" +
" List<@NonNull String> l2 = dubious;\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'List<String>\' needs unchecked conversion to conform to \'List<@NonNull String>\'\n" +
"----------\n" +
"5. WARNING in X.java (at line 15)\n" +
" acceptNulls(dubious);\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'List<String>\' needs unchecked conversion to conform to \'List<@NonNull String>\'\n" +
"----------\n" +
"6. WARNING in X.java (at line 16)\n" +
" acceptNoNulls(dubious);\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'List<String>\' needs unchecked conversion to conform to \'List<@NonNull String>\'\n" +
"----------\n");
}
// types without null annotations are converted (unsafe) to types with detail annotations (array content)
public void testCompatibility3a() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n"
+ "public class X {\n"
+ " @NonNull String[] return1(String[] dubious) {\n"
+ " return dubious;\n"
+ " }\n"
+ " @Nullable String[] return2(String[] dubious) {\n"
+ " return dubious;\n"
+ " }\n"
+ " void assigns(String[] dubious) {\n"
+ " @Nullable String[] l1 = dubious;\n"
+ " @NonNull String[] l2 = dubious;\n"
+ " }\n"
+ " void arguments(String[] dubious) {\n"
+ " acceptNulls(dubious);\n"
+ " acceptNoNulls(dubious);\n"
+ " }\n"
+ " void acceptNulls(@Nullable String[] withNulls) {}\n"
+ " void acceptNoNulls(@NonNull String[] noNulls) {}\n"
+ "}\n"
},
"----------\n" +
"1. WARNING in X.java (at line 4)\n" +
" return dubious;\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String[]\' needs unchecked conversion to conform to \'@NonNull String []\'\n" +
"----------\n" +
"2. WARNING in X.java (at line 7)\n" +
" return dubious;\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String[]\' needs unchecked conversion to conform to \'@Nullable String []\'\n" +
"----------\n" +
"3. WARNING in X.java (at line 10)\n" +
" @Nullable String[] l1 = dubious;\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String[]\' needs unchecked conversion to conform to \'@Nullable String []\'\n" +
"----------\n" +
"4. WARNING in X.java (at line 11)\n" +
" @NonNull String[] l2 = dubious;\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String[]\' needs unchecked conversion to conform to \'@NonNull String []\'\n" +
"----------\n" +
"5. WARNING in X.java (at line 14)\n" +
" acceptNulls(dubious);\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String[]\' needs unchecked conversion to conform to \'@Nullable String []\'\n" +
"----------\n" +
"6. WARNING in X.java (at line 15)\n" +
" acceptNoNulls(dubious);\n" +
" ^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String[]\' needs unchecked conversion to conform to \'@NonNull String []\'\n" +
"----------\n");
}
// types with null annotations on details (type parameter) are incompatible to opposite types
public void testCompatibility4() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n"
+ "import java.util.*;\n"
+ "public class X {\n"
+ " List<@Nullable String> return1(List<@NonNull String> noNulls) {\n"
+ " return noNulls;\n"
+ " }\n"
+ " List<@NonNull String> return2(List<@Nullable String> withNulls) {\n"
+ " return withNulls;\n"
+ " }\n"
+ " void assigns(List<@NonNull String> noNulls, List<@Nullable String> withNulls) {\n"
+ " List<@NonNull String> l1 = withNulls;\n"
+ " List<@Nullable String> l2 = noNulls;\n"
+ " }\n"
+ " void arguments(List<@NonNull String> noNulls, List<@Nullable String> withNulls) {\n"
+ " assigns(withNulls, noNulls);\n"
+ " }\n"
+ "}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 5)\n" +
" return noNulls;\n" +
" ^^^^^^^\n" +
"Null type mismatch (type annotations): required 'List<@Nullable String>' but this expression has type 'List<@NonNull String>'\n" +
"----------\n" +
"2. ERROR in X.java (at line 8)\n" +
" return withNulls;\n" +
" ^^^^^^^^^\n" +
"Null type mismatch (type annotations): required 'List<@NonNull String>' but this expression has type 'List<@Nullable String>'\n" +
"----------\n" +
"3. ERROR in X.java (at line 11)\n" +
" List<@NonNull String> l1 = withNulls;\n" +
" ^^^^^^^^^\n" +
"Null type mismatch (type annotations): required 'List<@NonNull String>' but this expression has type 'List<@Nullable String>'\n" +
"----------\n" +
"4. ERROR in X.java (at line 12)\n" +
" List<@Nullable String> l2 = noNulls;\n" +
" ^^^^^^^\n" +
"Null type mismatch (type annotations): required 'List<@Nullable String>' but this expression has type 'List<@NonNull String>'\n" +
"----------\n" +
"5. ERROR in X.java (at line 15)\n" +
" assigns(withNulls, noNulls);\n" +
" ^^^^^^^^^\n" +
"Null type mismatch (type annotations): required 'List<@NonNull String>' but this expression has type 'List<@Nullable String>'\n" +
"----------\n" +
"6. ERROR in X.java (at line 15)\n" +
" assigns(withNulls, noNulls);\n" +
" ^^^^^^^\n" +
"Null type mismatch (type annotations): required 'List<@Nullable String>' but this expression has type 'List<@NonNull String>'\n" +
"----------\n");
}
// types with null annotations on details (array content) are incompatible to opposite types
public void testCompatibility4a() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n"
+ "public class X {\n"
+ " @Nullable String[] return1(@NonNull String[] noNulls) {\n"
+ " return noNulls;\n"
+ " }\n"
+ " @NonNull String[] return2(@Nullable String[] withNulls) {\n"
+ " return withNulls;\n"
+ " }\n"
+ " void assigns(@NonNull String[] noNulls, @Nullable String[] withNulls) {\n"
+ " @NonNull String[] l1 = withNulls;\n"
+ " @Nullable String[] l2 = noNulls;\n"
+ " }\n"
+ " void arguments(@NonNull String[] noNulls, @Nullable String[] withNulls) {\n"
+ " assigns(withNulls, noNulls);\n"
+ " }\n"
+ "}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" return noNulls;\n" +
" ^^^^^^^\n" +
"Null type mismatch (type annotations): required \'@Nullable String []\' but this expression has type \'@NonNull String []\'\n" +
"----------\n" +
"2. ERROR in X.java (at line 7)\n" +
" return withNulls;\n" +
" ^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull String []\' but this expression has type \'@Nullable String []\'\n" +
"----------\n" +
"3. ERROR in X.java (at line 10)\n" +
" @NonNull String[] l1 = withNulls;\n" +
" ^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull String []\' but this expression has type \'@Nullable String []\'\n" +
"----------\n" +
"4. ERROR in X.java (at line 11)\n" +
" @Nullable String[] l2 = noNulls;\n" +
" ^^^^^^^\n" +
"Null type mismatch (type annotations): required \'@Nullable String []\' but this expression has type \'@NonNull String []\'\n" +
"----------\n" +
"5. ERROR in X.java (at line 14)\n" +
" assigns(withNulls, noNulls);\n" +
" ^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull String []\' but this expression has type \'@Nullable String []\'\n" +
"----------\n" +
"6. ERROR in X.java (at line 14)\n" +
" assigns(withNulls, noNulls);\n" +
" ^^^^^^^\n" +
"Null type mismatch (type annotations): required \'@Nullable String []\' but this expression has type \'@NonNull String []\'\n" +
"----------\n");
}
// challenge parameterized type with partial substitution of super's type parameters
public void testCompatibility5() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.util.Map;\n" +
"\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"abstract public class X<Y> implements Map<@NonNull String,Y> {\n" +
" void foo(X<Object> x) {\n" +
" Map<@NonNull String, Object> m1 = x; // OK\n" +
" Map<@Nullable String, Object> m2 = x; // NOK\n" +
" }\n" +
"}"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 8)\n" +
" Map<@Nullable String, Object> m2 = x; // NOK\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'Map<@Nullable String,Object>\' but this expression has type \'X<Object>\', corresponding supertype is \'Map<@NonNull String,Object>\'\n" +
"----------\n");
}
// challenge parameterized type with partial substitution of super's type parameters
public void testCompatibility6() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.util.Map;\n" +
"\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"abstract public class X<@Nullable Y> implements Map<@Nullable String,Y> {\n" +
" void foo(X<@Nullable Object> x) {\n" +
" Map<@Nullable String, @Nullable Object> m1 = x; // OK\n" +
" Map<@Nullable String, @NonNull Object> m2 = x; // NOK\n" +
" }\n" +
"}"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 8)\n" +
" Map<@Nullable String, @NonNull Object> m2 = x; // NOK\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'Map<@Nullable String,@NonNull Object>\' but this expression has type \'X<@Nullable Object>\', corresponding supertype is \'Map<@Nullable String,@Nullable Object>\'\n" +
"----------\n");
}
// illegal for type declaration
public void testUnsupportedLocation01() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public @NonNull class X {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 2)\n" +
" public @NonNull class X {}\n" +
" ^^^^^^^^\n" +
"The nullness annotation \'NonNull\' is not applicable at this location\n" +
"----------\n");
}
// illegal for enclosing class (locations: field, argument, return type, local
public void testUnsupportedLocation02() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" class Inner {}\n" +
" @NonNull X.Inner f;\n" +
" @NonNull X.Inner foo(@NonNull X.Inner arg) {\n" +
" @NonNull X.Inner local = arg;\n" +
" return local;\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" @NonNull X.Inner f;\n" +
" ^^^^^^^^\n" +
"The nullness annotation \'NonNull\' is not applicable at this location\n" +
"----------\n" +
"2. ERROR in X.java (at line 5)\n" +
" @NonNull X.Inner foo(@NonNull X.Inner arg) {\n" +
" ^^^^^^^^\n" +
"The nullness annotation \'NonNull\' is not applicable at this location\n" +
"----------\n" +
"3. ERROR in X.java (at line 5)\n" +
" @NonNull X.Inner foo(@NonNull X.Inner arg) {\n" +
" ^^^^^^^^\n" +
"The nullness annotation \'NonNull\' is not applicable at this location\n" +
"----------\n" +
"4. ERROR in X.java (at line 6)\n" +
" @NonNull X.Inner local = arg;\n" +
" ^^^^^^^^\n" +
"The nullness annotation \'NonNull\' is not applicable at this location\n" +
"----------\n");
}
// illegal / unchecked for cast & instanceof with scalar type
public void testUnsupportedLocation03() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" @NonNull X foo(X arg) {\n" +
" if (!(arg instanceof @NonNull X))\n" +
" return (@NonNull X)arg;\n" +
" return arg;\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. WARNING in X.java (at line 4)\n" +
" if (!(arg instanceof @NonNull X))\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"The expression of type X is already an instance of type X\n" +
"----------\n" +
"2. ERROR in X.java (at line 4)\n" +
" if (!(arg instanceof @NonNull X))\n" +
" ^^^^^^^^^^\n" +
"Nullness annotations are not applicable at this location \n" +
"----------\n" +
"3. WARNING in X.java (at line 5)\n" +
" return (@NonNull X)arg;\n" +
" ^^^^^^^^^^^^^^^\n" +
"Null type safety: Unchecked cast from X to @NonNull X\n" +
"----------\n");
}
// illegal / unchecked for cast & instanceof with complex type
public void testUnsupportedLocation04() {
runNegativeTestWithLibs(
new String[] {
"p/X.java",
"package p;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"public class X {\n" +
" List<@NonNull X> parameterized(List<X> arg) {\n" +
" if (!(arg instanceof List<@NonNull X>))\n" +
" return (java.util.List<@NonNull X>)arg;\n" +
" return arg;\n" +
" }\n" +
" X @NonNull[] arrays(X[] arg) {\n" +
" if (!(arg instanceof X @NonNull[]))\n" +
" return (p.X @NonNull[])arg;\n" +
" return arg;\n" +
" }\n" +
" ArrayList<@NonNull String> foo(List<@NonNull String> l) {\n" +
" return (ArrayList<@NonNull String>) l;\n" + // OK
" }" +
" ArrayList<@NonNull String> foo2(List<@NonNull String> l) {\n" +
" return (ArrayList<String>) l;\n" + // warn, TODO(stephan) with flow analysis (bug 415292) we might recover the original @NonNull...
" }" +
"}\n"
},
"----------\n" +
"1. ERROR in p\\X.java (at line 6)\n" +
" if (!(arg instanceof List<@NonNull X>))\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Cannot perform instanceof check against parameterized type List<X>. Use the form List<?> instead since further generic type information will be erased at runtime\n" +
"----------\n" +
"2. ERROR in p\\X.java (at line 6)\n" +
" if (!(arg instanceof List<@NonNull X>))\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Nullness annotations are not applicable at this location \n" +
"----------\n" +
"3. WARNING in p\\X.java (at line 7)\n" +
" return (java.util.List<@NonNull X>)arg;\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety: Unchecked cast from List<X> to List<@NonNull X>\n" +
"----------\n" +
"4. WARNING in p\\X.java (at line 11)\n" +
" if (!(arg instanceof X @NonNull[]))\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"The expression of type X[] is already an instance of type X[]\n" +
"----------\n" +
"5. ERROR in p\\X.java (at line 11)\n" +
" if (!(arg instanceof X @NonNull[]))\n" +
" ^^^^^^^^^^^^\n" +
"Nullness annotations are not applicable at this location \n" +
"----------\n" +
"6. WARNING in p\\X.java (at line 12)\n" +
" return (p.X @NonNull[])arg;\n" +
" ^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety: Unchecked cast from X[] to X @NonNull[]\n" +
"----------\n" +
"7. WARNING in p\\X.java (at line 18)\n" +
" return (ArrayList<String>) l;\n" +
" ^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'ArrayList<String>\' needs unchecked conversion to conform to \'ArrayList<@NonNull String>\'\n" +
"----------\n");
}
// illegal instanceof check with annotated type argument
public void testUnsupportedLocation04a() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"public class X {\n" +
" boolean instanceOf2(Object o) {\n" +
" return o instanceof List<@Nullable ?>;\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 5)\n" +
" return o instanceof List<@Nullable ?>;\n" +
" ^^^^^^^^^^^^^^^^^\n" +
"Nullness annotations are not applicable at this location \n" +
"----------\n");
}
// illegal for allocation expression
public void testUnsupportedLocation05() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" X x = new @NonNull X();\n" +
" class Inner {}\n" +
" Inner i = this.new @Nullable Inner();\n" +
" java.util.List<@NonNull String> s = new java.util.ArrayList<@NonNull String>();\n" + // OK
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 3)\n" +
" X x = new @NonNull X();\n" +
" ^^^^^^^^\n" +
"The nullness annotation \'NonNull\' is not applicable at this location\n" +
"----------\n" +
"2. ERROR in X.java (at line 5)\n" +
" Inner i = this.new @Nullable Inner();\n" +
" ^^^^^^^^^\n" +
"The nullness annotation \'Nullable\' is not applicable at this location\n" +
"----------\n");
}
// method receiver
public void testUnsupportedLocation06() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" void receiver(@Nullable X this, Object o) {}\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 3)\n" +
" void receiver(@Nullable X this, Object o) {}\n" +
" ^^^^^^^^^^^\n" +
"Nullness annotations are not applicable at this location \n" +
"----------\n");
}
// receiver type in method/constructor reference
public void testUnsupportedLocation07() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.function.Supplier;\n" +
"public class X {\n" +
" void consume(Supplier<Object> c) {}\n" +
" static Object supply() { return null; }\n" +
" void consumeSupplied() {\n" +
" consume(@NonNull X::supply);\n" +
" consume(@NonNull X::new);\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 7)\n" +
" consume(@NonNull X::supply);\n" +
" ^^^^^^^^^^\n" +
"Nullness annotations are not applicable at this location \n" +
"----------\n" +
"2. ERROR in X.java (at line 8)\n" +
" consume(@NonNull X::new);\n" +
" ^^^^^^^^^^\n" +
"Nullness annotations are not applicable at this location \n" +
"----------\n");
}
// exceptions (throws & catch)
public void testUnsupportedLocation08() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.io.*;\n" +
"public class X {\n" +
" void throwsDecl() throws @Nullable IOException {}\n" +
" void excParam() {\n" +
" try {\n" +
" throwsDecl();\n" +
" } catch (@NonNull IOException ioe) {}\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" void throwsDecl() throws @Nullable IOException {}\n" +
" ^^^^^^^^^^^^^^^^^^^^^\n" +
"Nullness annotations are not applicable at this location \n" +
"----------\n" +
"2. ERROR in X.java (at line 8)\n" +
" } catch (@NonNull IOException ioe) {}\n" +
" ^^^^^^^^^^^\n" +
"Nullness annotations are not applicable at this location \n" +
"----------\n");
}
public void testForeach() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"public class X {\n" +
" void foo(List<@NonNull String> nns) {\n" +
" for(String s1 : nns) {\n" +
" logMsg(s1);\n" +
" }\n" +
" for(String s2 : getStrings()) {\n" +
" logMsg(s2);\n" +
" }\n" +
" }\n" +
" Collection<@Nullable String> getStrings() { return null; }\n" +
" void logMsg(@NonNull String msg) { }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 9)\n" +
" logMsg(s2);\n" +
" ^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is inferred as @Nullable\n" +
"----------\n");
}
// poly-null method
public void testNullTypeInference1() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"public class X {\n" +
" <T> List<T> polyNullMethod(List<T> in) { return in; }\n" +
" @NonNull String test1(List<@NonNull String> strings) {\n" +
" return polyNullMethod(strings).get(0);\n" +
" }\n" +
" @NonNull String test2(List<@Nullable String> strings) {\n" +
" return polyNullMethod(strings).get(0);\n" +
" }\n" +
" @Nullable String test3(List<@NonNull String> strings) {\n" +
" return polyNullMethod(strings).get(0);\n" +
" }\n" +
" @Nullable String test4(List<@Nullable String> strings) {\n" +
" return polyNullMethod(strings).get(0);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 9)\n" +
" return polyNullMethod(strings).get(0);\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull String\' but this expression has type \'@Nullable String\'\n" +
"----------\n");
}
// functional interface with explicit nullness
public void testNullTypeInference2a() {
runNegativeTestWithLibs(
new String[] {
"PolyNull.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"interface NNFunc {\n" +
" @NonNull String a(@NonNull String i);\n" +
"}\n" +
"public class PolyNull {\n" +
" @NonNull String extract(NNFunc f, @NonNull String s) { return f.a(s); }\n" +
" @NonNull String testOK() {\n" +
" return extract(i -> i, \"hallo\");\n" +
" }\n" +
" @NonNull String testERR() {\n" +
" return extract(i -> null, \"hallo\"); // err\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in PolyNull.java (at line 12)\n" +
" return extract(i -> null, \"hallo\"); // err\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n");
}
// functional interface with nullness inferred from target type with explicit nullness
public void testNullTypeInference2b() {
runNegativeTestWithLibs(
new String[] {
"PolyNull.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"interface Func<T> {\n" +
" T a(T i);\n" +
"}\n" +
"public class PolyNull {\n" +
" @NonNull String extract(Func<@NonNull String> f, @NonNull String s) { return f.a(s); }\n" +
" @NonNull String testOK() {\n" +
" return extract(i -> i, \"hallo\");\n" +
" }\n" +
" @NonNull String testERR() {\n" +
" return extract(i -> null, \"hallo\"); // err\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in PolyNull.java (at line 12)\n" +
" return extract(i -> null, \"hallo\"); // err\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n");
}
// functional interface with unspecified nullness matched against lambda parameter with explicit type & nullness
public void testNullTypeInference2c() {
runNegativeTestWithLibs(
new String[] {
"PolyNull.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"interface Func<T> {\n" +
" T a(T i);\n" +
"}\n" +
"public class PolyNull {\n" +
" <X> X extract(Func<X> f, X s) { return f.a(s); }\n" +
" @NonNull String testOK() {\n" +
" return extract((@NonNull String i) -> i, \"hallo\");\n" +
" }\n" +
" @NonNull String testERR() {\n" +
" return extract((@NonNull String i) -> null, \"hallo\"); // err\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in PolyNull.java (at line 12)\n" +
" return extract((@NonNull String i) -> null, \"hallo\"); // err\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n");
}
// the only null annotation is on the target type, which propagates into the implicitly typed lambda argument
public void testNullTypeInference2d() {
runNegativeTestWithLibs(
new String[] {
"PolyNull.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"interface Func<T> {\n" +
" T a(T i);\n" +
"}\n" +
"public class PolyNull {\n" +
" <X> X extract(Func<X> f, X s) { return f.a(s); }\n" +
" @NonNull String testOK() {\n" +
" return extract(i -> i, \"hallo\");\n" +
" }\n" +
" @NonNull String testERR() {\n" +
" return extract(i -> null, \"hallo\"); // err\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in PolyNull.java (at line 12)\n" +
" return extract(i -> null, \"hallo\"); // err\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n");
}
// demonstrate that null annotations from the functional interface win, resulting in successful inference but null-safety issues
public void testNullTypeInference2e() {
runNegativeTestWithLibs(
new String[] {
"PolyNull.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"interface Func<T> {\n" +
" T a(T i);\n" +
"}\n" +
"public class PolyNull {\n" +
" String extract(Func<@Nullable String> f, @Nullable String s) { return f.a(s); }\n" +
" @NonNull String testWARN() {\n" +
" return extract(i -> null, \"hallo\"); // OK to pass null\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in PolyNull.java (at line 9)\n" +
" return extract(i -> null, \"hallo\"); // OK to pass null\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String\' needs unchecked conversion to conform to \'@NonNull String\'\n" +
"----------\n");
}
// demonstrate that null annotations from the functional interface win, resulting in successful inference but null-safety issues
public void testNullTypeInference2f() {
runNegativeTestWithLibs(
new String[] {
"PolyNull.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"interface Func<T> {\n" +
" T a(T i);\n" +
"}\n" +
"public class PolyNull {\n" +
" <X> X extract(Func<@Nullable X> f, @Nullable X s) { return f.a(s); }\n" +
" @NonNull String testERR() {\n" +
" return extract(i -> needNN(i), \"ola\");\n" +
" }\n" +
" @NonNull String needNN(@NonNull String s) { return \"\"; }\n" +
"" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in PolyNull.java (at line 7)\n" +
" <X> X extract(Func<@Nullable X> f, @Nullable X s) { return f.a(s); }\n" +
" ^^^^^^\n" +
"Null type mismatch (type annotations): required \'X\' but this expression has type \'@Nullable X\', where 'X' is a free type variable\n" +
"----------\n" +
"2. ERROR in PolyNull.java (at line 9)\n" +
" return extract(i -> needNN(i), \"ola\");\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'@NonNull String\' but this expression has type \'@Nullable String\'\n" +
"----------\n");
}
// seemingly conflicting annotations from type variable application and type variable substitution
// -> ignore @Nullable which overrides the type variable's nullness for this one location
public void testNullTypeInference3() {
Map compilerOptions = getCompilerOptions();
compilerOptions.put(JavaCore.COMPILER_PB_NULL_UNCHECKED_CONVERSION, JavaCore.ERROR);
runNegativeTestWithLibs(
new String[] {
"Generics.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class Generics {\n" +
" <X> X m(@Nullable X a) { return null; }\n" +
" void test(@NonNull String in) {\n" +
" @NonNull String s = m(in);\n" + // inferred OK as 'm(@Nullable String) -> @NonNull String'
" System.out.println(s.toLowerCase());\n" +
" }\n" +
" public static void main(String[] args) {\n" +
" new Generics().test(\"hallo\");\n" +
" }\n" +
"}\n"
},
compilerOptions,
"----------\n" +
"1. ERROR in Generics.java (at line 4)\n" +
" <X> X m(@Nullable X a) { return null; }\n" +
" ^^^^\n" +
"Null type mismatch (type annotations): \'null\' is not compatible to the free type variable 'X'\n" +
"----------\n");
}
// conflicting annotations from type variable application and type variable substitution -> exclude null annotations from inference
public void testNullTypeInference3b() {
runNegativeTestWithLibs(
new String[] {
"Generics.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class Generics {\n" +
" <X> @Nullable X m1(@Nullable X a) { return null; }\n" +
" <X> @Nullable X m2(X a) { return null; }\n" +
" void test(@NonNull String in) {\n" +
" @NonNull String s1 = m1(in);\n" +
" @NonNull String s2 = m2(in);\n" +
" }\n" +
" public static void main(String[] args) {\n" +
" new Generics().test(\"hallo\");\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Generics.java (at line 7)\n" +
" @NonNull String s1 = m1(in);\n" +
" ^^^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull String\' but this expression has type \'@Nullable String\'\n" +
"----------\n" +
"2. ERROR in Generics.java (at line 8)\n" +
" @NonNull String s2 = m2(in);\n" +
" ^^^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull String\' but this expression has type \'@Nullable String\'\n" +
"----------\n");
}
// conflicting annotations from type variable application and type variable substitution
public void testNullTypeInference3c() {
runNegativeTestWithLibs(
new String[] {
"Generics.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"\n" +
"interface Function<I,O> { }\n" +
"abstract class MyFunc implements Function<@NonNull Object, @Nullable String> { }\n" +
" \n" +
"public class Generics {\n" +
" <@NonNull I,@Nullable O> \n" +
" Collection<O> map1(Collection<I> in, Function<I, O> f) { return null; }\n" +
" <@Nullable I,@NonNull O> \n" +
" Collection<O> map2(Collection<I> in, Function<I, O> f) { return null; }\n" +
" void test(@NonNull List<Object> inList, MyFunc f) {\n" +
" Collection<@Nullable String> result = map1(inList, f);\n" +
" map2(inList, f);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in Generics.java (at line 13)\n" +
" Collection<@Nullable String> result = map1(inList, f);\n" +
" ^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'@NonNull List<Object>\' needs unchecked conversion to conform to \'Collection<@NonNull Object>\', corresponding supertype is 'Collection<Object>'\n" +
"----------\n" +
"2. WARNING in Generics.java (at line 14)\n" +
" map2(inList, f);\n" +
" ^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'@NonNull List<Object>\' needs unchecked conversion to conform to \'Collection<@Nullable Object>\', corresponding supertype is 'Collection<Object>'\n" +
"----------\n" +
"3. ERROR in Generics.java (at line 14)\n" +
" map2(inList, f);\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'Function<@Nullable Object,@NonNull String>\' but this expression has type \'MyFunc\', corresponding supertype is \'Function<@NonNull Object,@Nullable String>\'\n" +
"----------\n");
}
// missing return type should not cause NPE
public void testBug415850_01() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" @NonNull foo() {}\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 3)\n" +
" @NonNull foo() {}\n" +
" ^^^^^\n" +
"Return type for the method is missing\n" +
"----------\n");
}
// enum constant inside raw type: initialization must be recognized as conform to the implicitly @NonNull declaration
public void testBug415850_02(){
runConformTestWithLibs(
new String[] {
"Callable.java",
"interface Callable<T> {\n" +
" public enum Result {\n" +
" GOOD, BAD\n" +
" };\n" +
" public Result call(T arg);\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// when mapping 1st parameter to method receiver, avoid AIOOBE in ReferenceExpression#resolveType(..)
public void testBug415850_03() throws Exception {
Map options = getCompilerOptions();
options.put(JavaCore.COMPILER_PB_DEPRECATION, JavaCore.IGNORE);
runConformTestWithLibs(
new String[] {
"X.java",
"import java.lang.annotation.*;\n" +
"import java.util.Date;\n" +
"import static java.lang.annotation.ElementType.*; \n" +
"@Target(TYPE_USE)\n" +
"@interface Vernal {}\n" +
"interface I {\n" +
" int f(Date d);\n" +
"}\n" +
"class X {\n" +
" static void monitorTemperature(Object myObject) {\n" +
" I i = @Vernal Date::getDay;\n" +
" }\n" +
"}\n",
},
options,
"");
}
// ensure annotation type has super types connected, to avoid NPE in ImplicitNullAnnotationVerifier.collectOverriddenMethods(..)
public void testBug415850_04() throws Exception {
runConformTestWithLibs(
new String[] {
"X.java",
"public class X implements @B @C('i') J { }",
"B.java",
"import java.lang.annotation.Target;\n" +
"import static java.lang.annotation.ElementType.*;\n" +
"import java.lang.annotation.Retention;\n" +
"import static java.lang.annotation.RetentionPolicy.*;\n" +
"@Target(TYPE_USE)\n" +
"@Retention(CLASS)\n" +
"@interface B {\n" +
" int value() default -1;\n" +
"}",
"C.java",
"import java.lang.annotation.Target;\n" +
"import static java.lang.annotation.ElementType.*;\n" +
"import java.lang.annotation.Retention;\n" +
"import static java.lang.annotation.RetentionPolicy.*;\n" +
"@Target(TYPE_USE)\n" +
"@Retention(RUNTIME)\n" +
"@interface C {\n" +
" char value() default '-';\n" +
"}\n",
"J.java",
"interface J {}\n"
},
getCompilerOptions(),
"");
}
// don't let type annotations on array dimensions spoil type compatibility
public void testBug415850_05() {
runNegativeTestWithLibs(
new String[]{
"X.java",
"import java.lang.annotation.Target;\n" +
"import static java.lang.annotation.ElementType.*;\n" +
"public class X {\n" +
" public void foo() {\n" +
" int @Marker [][][] i = new @Marker int @Marker [2] @Marker [@Marker bar()] @Marker [];\n" +
" }\n" +
" public int bar() {\n" +
" return 2;\n" +
" }\n" +
"}\n" +
"@Target (java.lang.annotation.ElementType.TYPE_USE)\n" +
"@interface Marker {}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 5)\n" +
" int @Marker [][][] i = new @Marker int @Marker [2] @Marker [@Marker bar()] @Marker [];\n" +
" ^^^^^^^\n" +
"Syntax error, type annotations are illegal here\n" +
"----------\n");
}
// don't let type annotations on array dimensions spoil type compatibility
// case without any error
public void testBug415850_06() {
runConformTestWithLibs(
new String[]{
"X.java",
"import java.lang.annotation.Target;\n" +
"public class X {\n" +
" public void foo() {\n" +
" int @Marker [][][] i = new @Marker int @Marker [2] @Marker [bar()] @Marker [];\n" +
" }\n" +
" public int bar() {\n" +
" return 2;\n" +
" }\n" +
"}\n" +
"@Target (java.lang.annotation.ElementType.TYPE_USE)\n" +
"@interface Marker {}\n"
},
getCompilerOptions(),
"");
}
public void testBug416172() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"\n" +
"public class X {\n" +
" class Y {}\n" +
" X.@NonNull Y foo(X.@NonNull Y xy) {\n" +
" return new X().new Y();\n" +
" }\n" +
"}\n" +
"\n" +
"class Z extends X {\n" +
" @Override\n" +
" X.@NonNull Y foo(X.Y xy) {\n" +
" return null;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 12)\n" +
" X.@NonNull Y foo(X.Y xy) {\n" +
" ^^^\n" +
"Missing non-null annotation: inherited method from X specifies this parameter as @NonNull\n" +
"----------\n" +
"2. ERROR in X.java (at line 13)\n" +
" return null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'X.@NonNull Y\' but the provided value is null\n" +
"----------\n");
}
// incompatible null constraints on parameters
public void testBug416174() {
Map options = getCompilerOptions();
options.put(JavaCore.COMPILER_PB_NONNULL_PARAMETER_ANNOTATION_DROPPED, JavaCore.IGNORE);
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.util.List;\n" +
"\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class X {\n" +
" void foo1(List<X> lx) {}\n" +
" void foo2(List<@NonNull X> lx) {}\n" +
" void foo3(List<@Nullable X> lx) {}\n" +
" void foo4(@NonNull List<@Nullable X> lx) {}\n" +
"}\n" +
"\n" +
"class Z extends X {\n" +
" @Override void foo1(List<@NonNull X> xy) {}\n" +
" @Override void foo2(List<X> lx) {}\n" +
" @Override void foo3(List<X> lx) {}\n" +
" @Override void foo4(List<@Nullable X> lx) {}\n" + // omitting annotation at toplevel can be tolerated (via option)
"}\n"
},
options,
"----------\n" +
"1. ERROR in X.java (at line 13)\n" +
" @Override void foo1(List<@NonNull X> xy) {}\n" +
" ^^^^\n" +
"Illegal redefinition of parameter xy, inherited method from X declares this parameter as \'List<X>\' (mismatching null constraints)\n" +
"----------\n" +
"2. ERROR in X.java (at line 14)\n" +
" @Override void foo2(List<X> lx) {}\n" +
" ^^^^\n" +
"Illegal redefinition of parameter lx, inherited method from X declares this parameter as \'List<@NonNull X>\' (mismatching null constraints)\n" +
"----------\n" +
"3. ERROR in X.java (at line 15)\n" +
" @Override void foo3(List<X> lx) {}\n" +
" ^^^^\n" +
"Illegal redefinition of parameter lx, inherited method from X declares this parameter as \'List<@Nullable X>\' (mismatching null constraints)\n" +
"----------\n");
}
// incompatibility at return type, which should be shown here in the error message
public void testBug416174b() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.util.*;\n" +
"\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public abstract class X {\n" +
" List<X> foo1() {\n" +
" return null;\n" +
" }\n" +
" List<@Nullable X> foo2() {\n" +
" return null;\n" +
" }\n" +
" abstract @NonNull List<@NonNull X> foo3();\n" +
" List<@Nullable X> foo4() {\n" +
" return null;\n" +
" }\n" +
"}\n" +
"\n" +
"abstract class Z extends X {\n" +
" @Override\n" +
" List<@NonNull X> foo1() {\n" +
" return null;\n" +
" }\n" +
" @Override\n" +
" List<@NonNull X> foo2() {\n" +
" return null;\n" +
" }\n" +
" @Override\n" +
" @NonNull List<X> foo3() {\n" +
" return new ArrayList<>();\n" +
" }\n" +
" @Override\n" +
" @NonNull List<@Nullable X> foo4() {\n" + // OK
" return new ArrayList<>();\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 20)\n" +
" List<@NonNull X> foo1() {\n" +
" ^^^^\n" +
"The return type is incompatible with \'List<X>\' returned from X.foo1() (mismatching null constraints)\n" +
"----------\n" +
"2. ERROR in X.java (at line 24)\n" +
" List<@NonNull X> foo2() {\n" +
" ^^^^\n" +
"The return type is incompatible with \'List<@Nullable X>\' returned from X.foo2() (mismatching null constraints)\n" +
"----------\n" +
"3. ERROR in X.java (at line 28)\n" +
" @NonNull List<X> foo3() {\n" +
" ^^^^\n" +
"The return type is incompatible with \'@NonNull List<@NonNull X>\' returned from X.foo3() (mismatching null constraints)\n" +
"----------\n");
}
public void testBug416175() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.util.ArrayList;\n" +
"import java.util.List;\n" +
"\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"\n" +
"public class X {\n" +
" public static void main(String[] args) {\n" +
" List<@NonNull ? extends @NonNull String> ls = new ArrayList<String>();\n" +
" ls.add(null);\n" +
" @NonNull String s = ls.get(0);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 8)\n" +
" List<@NonNull ? extends @NonNull String> ls = new ArrayList<String>();\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'ArrayList<String>\' needs unchecked conversion to conform to \'List<@NonNull ? extends @NonNull String>\', corresponding supertype is 'List<String>'\n" +
"----------\n" +
"2. ERROR in X.java (at line 9)\n" +
" ls.add(null);\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull ? extends @NonNull String\' but the provided value is null\n" +
"----------\n");
}
// original test (was throwing stack overflow)
public void testBug416176() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"\n" +
"public class X<@NonNull T> {\n" +
" T foo(T t) {\n" +
" return t;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// variant to challenge merging of annotation on type variable and its use
public void testBug416176a() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"public class X<@NonNull T> {\n" +
" T foo(T t) {\n" +
" return t;\n" +
" }\n" +
" @NonNull T bar1(@NonNull T t) {\n" +
" return t;\n" +
" }\n" +
" @NonNull T bar2(@Nullable T t) { // argument: no contradiction (1)\n" +
" return t; // mismatch (1)\n" +
" }\n" +
" @Nullable T bar3(T t) { // return type: no contradiction (2)\n" +
" @Nullable T l = t; // local: no contradiction (3)\n" +
" return l;\n" +
" }\n" +
" class Inner {\n" +
" @Nullable T f; // field: no contradiction (4)\n" +
" }\n" +
" T bar3() {\n" +
" return null; // mismatch (2)\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 12)\n" +
" return t; // mismatch (1)\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'@NonNull T\' but this expression has type \'@Nullable T\'\n" +
"----------\n" +
"2. ERROR in X.java (at line 22)\n" +
" return null; // mismatch (2)\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull T\' but the provided value is null\n" +
"----------\n");
}
// variant to challenge duplicate methods, though with different parameter annotations
public void testBug416176b() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"public class X<T> {\n" +
" @NonNull T bar(@NonNull T t) {\n" +
" return t;\n" +
" }\n" +
" @NonNull T bar(@Nullable T t) {\n" +
" return t;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 5)\n" +
" @NonNull T bar(@NonNull T t) {\n" +
" ^^^^^^^^^^^^^^^^^\n" +
"Duplicate method bar(T) in type X<T>\n" +
"----------\n" +
"2. ERROR in X.java (at line 8)\n" +
" @NonNull T bar(@Nullable T t) {\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Duplicate method bar(T) in type X<T>\n" +
"----------\n");
}
public void testBug416180() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"\n" +
"public class X<T> {\n" +
" T foo(T t) {\n" +
" return t;\n" +
" }\n" +
" \n" +
" public static void main(String[] args) {\n" +
" X<String> x = new Y();\n" +
" }\n" +
"} \n" +
"\n" +
"class Y extends X<@NonNull String> {\n" +
" @Override\n" +
" @NonNull String foo(java.lang.@NonNull String t) {\n" +
" return \"\";\n" +
" };\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug416181() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"\n" +
"public class X<T> {\n" +
" class Y {\n" +
" \n" +
" }\n" +
" \n" +
" X<String>.@NonNull Y y = null; // 1st error here.\n" +
" \n" +
" @NonNull Y y2 = null; // 2nd error here.\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 8)\n" +
" X<String>.@NonNull Y y = null; // 1st error here.\n" +
" ^^^^\n" +
"Null type mismatch: required \'X<String>.@NonNull Y\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in X.java (at line 10)\n" +
" @NonNull Y y2 = null; // 2nd error here.\n" +
" ^^^^\n" +
"Null type mismatch: required \'X<T>.@NonNull Y\' but the provided value is null\n" +
"----------\n");
}
public void testBug416182() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"public class X<T> {\n" +
" T foo(@NonNull T t) {\n" +
" return t;\n" +
" }\n" +
" public static void main(String[] args) {\n" +
" X<@Nullable String> xs = new X<String>();\n" +
" xs.foo(null);\n" +
" }\n" +
" \n" +
" public void test(X<String> x) {\n" +
" X<@Nullable String> xs = x;\n" +
" xs.bar(null);\n" +
" }\n" +
" public void bar(T t) {}\n" +
"\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 9)\n" +
" X<@Nullable String> xs = new X<String>();\n" +
" ^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'X<String>\' needs unchecked conversion to conform to \'X<@Nullable String>\'\n" +
"----------\n" +
"2. ERROR in X.java (at line 10)\n" +
" xs.foo(null);\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n" +
"3. WARNING in X.java (at line 14)\n" +
" X<@Nullable String> xs = x;\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'X<String>\' needs unchecked conversion to conform to \'X<@Nullable String>\'\n" +
"----------\n");
}
// introduce unrelated method lookup before the bogus one
public void testBug416182a() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"public class X<T> {\n" +
" T foo(@NonNull T t) {\n" +
" return t;\n" +
" }\n" +
" void foo() {}\n" +
" public static void main(String[] args) {\n" +
" X<@Nullable String> xs = new X<String>();\n" +
" xs.foo();\n" +
" xs.foo(null);\n" +
" }\n" +
" \n" +
" public void test(X<String> x) {\n" +
" X<@Nullable String> xs = x;\n" +
" xs.bar(null);\n" +
" }\n" +
" public void bar(T t) {}\n" +
"\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 10)\n" +
" X<@Nullable String> xs = new X<String>();\n" +
" ^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'X<String>\' needs unchecked conversion to conform to \'X<@Nullable String>\'\n" +
"----------\n" +
"2. ERROR in X.java (at line 12)\n" +
" xs.foo(null);\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n" +
"3. WARNING in X.java (at line 16)\n" +
" X<@Nullable String> xs = x;\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'X<String>\' needs unchecked conversion to conform to \'X<@Nullable String>\'\n" +
"----------\n");
}
// avoid extra warning by use of diamond.
public void testBug416182b() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"public class X<T> {\n" +
" T foo(@NonNull T t) {\n" +
" return t;\n" +
" }\n" +
" public static void main(String[] args) {\n" +
" X<@Nullable String> xs = new X<>();\n" +
" xs.foo(null);\n" +
" }\n" +
" \n" +
" public void test(X<String> x) {\n" +
" X<@Nullable String> xs = x;\n" +
" xs.bar(null);\n" +
" }\n" +
" public void bar(T t) {}\n" +
"\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 10)\n" +
" xs.foo(null);\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n" +
"2. WARNING in X.java (at line 14)\n" +
" X<@Nullable String> xs = x;\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'X<String>\' needs unchecked conversion to conform to \'X<@Nullable String>\'\n" +
"----------\n");
}
public void testBug416183() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"\n" +
"public class X<T> {\n" +
" T foo(@NonNull T t) {\n" +
" return t;\n" +
" }\n" +
" public static void main(String[] args) {\n" +
" X<String> xs = new X<String>();\n" +
" xs.foo(\"\");\n" +
" }\n" +
" \n" +
"}\n"
},
getCompilerOptions(),
"");
}
// See https://bugs.eclipse.org/bugs/show_bug.cgi?id=417113#c25, point 4.
public void testSubstitution() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import java.util.List;\n" +
"import java.util.ArrayList;\n" +
"public class X<T> {\n" +
" T foo(@NonNull List<@NonNull T> l) {\n" +
" return l.get(0);\n" +
" } \n" +
" public static void main(String[] args) {\n" +
" X<String> s = new X<>();\n" +
" s.foo(new ArrayList<String>()); // (1)\n" +
" s.foo(null); // (2)\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 10)\n" +
" s.foo(new ArrayList<String>()); // (1)\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'ArrayList<String>\' needs unchecked conversion to conform to \'@NonNull List<@NonNull String>\', corresponding supertype is 'List<String>'\n" +
"----------\n" +
"2. ERROR in X.java (at line 11)\n" +
" s.foo(null); // (2)\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull List<@NonNull String>\' but the provided value is null\n" +
"----------\n");
}
// See https://bugs.eclipse.org/bugs/show_bug.cgi?id=417113#c25, point 4.
public void testSubstitution2() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"public class X<T> {\n" +
" T foo(@NonNull T @NonNull [] l) {\n" +
" return l[0];\n" +
" } \n" +
" public static void main(String[] args) {\n" +
" X<String> s = new X<>();\n" +
" s.foo(new String [] { null });\n" +
" s.foo(new String @Nullable [] { null });\n" +
" s.foo(new String @NonNull [] { null });\n" +
" s.foo(new @Nullable String @NonNull [] { null });\n" +
" s.foo(new @NonNull String @NonNull [] { \"\" });\n" +
" s.foo(null); // (2)\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 9)\n" +
" s.foo(new String [] { null });\n" +
" ^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String[]\' needs unchecked conversion to conform to \'@NonNull String @NonNull[]\'\n" +
"----------\n" +
"2. WARNING in X.java (at line 10)\n" +
" s.foo(new String @Nullable [] { null });\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String @Nullable[]\' needs unchecked conversion to conform to \'@NonNull String @NonNull[]\'\n" +
"----------\n" +
"3. WARNING in X.java (at line 11)\n" +
" s.foo(new String @NonNull [] { null });\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String @NonNull[]\' needs unchecked conversion to conform to \'@NonNull String @NonNull[]\'\n" +
"----------\n" +
"4. ERROR in X.java (at line 12)\n" +
" s.foo(new @Nullable String @NonNull [] { null });\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull String @NonNull[]\' but this expression has type \'@Nullable String @NonNull[]\'\n" +
"----------\n" +
"5. ERROR in X.java (at line 14)\n" +
" s.foo(null); // (2)\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String @NonNull[]\' but the provided value is null\n" +
"----------\n");
}
// See https://bugs.eclipse.org/bugs/show_bug.cgi?id=417113#c25, point 4.
public void testSubstitution3() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"public class X<T> {\n" +
" T foo(@NonNull T l) {\n" +
" return l;\n" +
" } \n" +
" public static void main(String[] args) {\n" +
" X<String> s = new X<>();\n" +
" s.foo(null);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 8)\n" +
" s.foo(null);\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n");
}
// See https://bugs.eclipse.org/bugs/show_bug.cgi?id=417113#c25, point 4.
public void testSubstitution4() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.lang.annotation.ElementType;\n" +
"import java.lang.annotation.Target;\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"@Target(ElementType.TYPE_USE)\n" +
"@interface TypeAnnotation {\n" +
"}\n" +
"public class X<T> {\n" +
" class Y {}\n" +
" void foo(@TypeAnnotation X<T>.@NonNull Y l) {\n" +
" } \n" +
" public static void main(String[] args) {\n" +
" X<String> s = new X<>();\n" +
" s.foo(null);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 13)\n" +
" s.foo(null);\n" +
" ^^^^\n" +
"Null type mismatch: required \'X<String>.@NonNull Y\' but the provided value is null\n" +
"----------\n");
}
// See https://bugs.eclipse.org/bugs/show_bug.cgi?id=417113#c25, point 4.
public void testSubstitution5() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"public class X<T> {\n" +
" void foo(@NonNull X<@NonNull ? extends T> p) {\n" +
" } \n" +
" public static void main(String[] args) {\n" +
" X<String> s = new X<>();\n" +
" X<@NonNull String> s2 = new X<@NonNull String>();\n" +
" s.foo(s);\n" +
" s.foo(s2);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 8)\n" +
" s.foo(s);\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'X<String>\' needs unchecked conversion to conform to \'@NonNull X<@NonNull ? extends String>\'\n" +
"----------\n");
}
// https://bugs.eclipse.org/417758 - [1.8][null] Null safety compromise during array creation.
// original test case
public void testArray1() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"\n" +
"public class X<T> {\n" +
" \n" +
" public static void main(String[] args) {\n" +
" @NonNull String @NonNull [] s = new @NonNull String [] { null };\n" +
" if (s != null && s[0] != null) {\n" +
" System.out.println(\"Not null\");\n" +
" }\n" +
" System.out.println(\"Length = \" + s[0].length());\n" +
" }\n" +
"}"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 6)\n" +
" @NonNull String @NonNull [] s = new @NonNull String [] { null };\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in X.java (at line 7)\n" +
" if (s != null && s[0] != null) {\n" +
" ^\n" +
"Redundant null check: comparing \'@NonNull String @NonNull[]\' against null\n" +
"----------\n" +
"3. ERROR in X.java (at line 7)\n" +
" if (s != null && s[0] != null) {\n" +
" ^^^^\n" +
"Redundant null check: comparing \'@NonNull String\' against null\n" +
"----------\n");
}
// https://bugs.eclipse.org/417758 - [1.8][null] Null safety compromise during array creation.
// two-dim array with annotations on dimensions
public void testArray2() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"\n" +
"public class X<T> {\n" +
" \n" +
" public static void main(String[] args) {\n" +
" @NonNull String @NonNull [][] s1 = new @NonNull String @NonNull [][] { null, { null} }; // problem at inner null\n" +
" @NonNull String @NonNull [][] s2 = new @NonNull String [] @NonNull [] { null, { null} }; // problem at both nulls\n" +
" }\n" +
"}"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 6)\n" +
" @NonNull String @NonNull [][] s1 = new @NonNull String @NonNull [][] { null, { null} }; // problem at inner null\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in X.java (at line 7)\n" +
" @NonNull String @NonNull [][] s2 = new @NonNull String [] @NonNull [] { null, { null} }; // problem at both nulls\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String @NonNull[]\' but the provided value is null\n" +
"----------\n" +
"3. ERROR in X.java (at line 7)\n" +
" @NonNull String @NonNull [][] s2 = new @NonNull String [] @NonNull [] { null, { null} }; // problem at both nulls\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n");
}
// https://bugs.eclipse.org/417758 - [1.8][null] Null safety compromise during array creation.
// three-dim array with annotations on dimensions, also assignment has a problem
public void testArray3() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"\n" +
"public class X<T> {\n" +
" \n" +
" public static void main(String[] args) {\n" +
" @NonNull String [][] @NonNull [] s = new @NonNull String []@NonNull [][] { null, { {null}, null/*ok*/ } };\n" +
" }\n" +
"}"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 6)\n" +
" @NonNull String [][] @NonNull [] s = new @NonNull String []@NonNull [][] { null, { {null}, null/*ok*/ } };\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'@NonNull String [] @NonNull[] []\' needs unchecked conversion to conform to \'@NonNull String [] [] @NonNull[]\'\n" +
"----------\n" +
"2. ERROR in X.java (at line 6)\n" +
" @NonNull String [][] @NonNull [] s = new @NonNull String []@NonNull [][] { null, { {null}, null/*ok*/ } };\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String @NonNull[] []\' but the provided value is null\n" +
"----------\n" +
"3. ERROR in X.java (at line 6)\n" +
" @NonNull String [][] @NonNull [] s = new @NonNull String []@NonNull [][] { null, { {null}, null/*ok*/ } };\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n");
}
public void testBug417759() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class X<T> {\n" +
" void foo(@NonNull X<@NonNull ?> l) { \n" +
" } \n" +
" public static void main(String[] args) {\n" +
" @NonNull X<String> s = new X<>();\n" +
" s.foo(s); // String vs. @NonNull ?\n" +
" @NonNull X<@Nullable String> s2 = new X<>();\n" +
" s.foo(s2); // @Nullable String vs. @NonNull ?\n" +
" @NonNull X<@NonNull String> s3 = new X<>();\n" +
" s.foo(s3); // good\n" +
" }\n" +
"}"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 8)\n" +
" s.foo(s); // String vs. @NonNull ?\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'@NonNull X<String>\' needs unchecked conversion to conform to \'@NonNull X<@NonNull ?>\'\n" +
"----------\n" +
"2. ERROR in X.java (at line 10)\n" +
" s.foo(s2); // @Nullable String vs. @NonNull ?\n" +
" ^^\n" +
"Null type mismatch (type annotations): required \'@NonNull X<@NonNull ?>\' but this expression has type \'@NonNull X<@Nullable String>\'\n" +
"----------\n");
}
public void testTypeVariable1() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.lang.annotation.ElementType;\n" +
"import java.lang.annotation.Target;\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"@Target(ElementType.TYPE_USE)\n" +
"@interface Junk {\n" +
"}\n" +
"public class X<@NonNull T> {\n" +
" T t = null;\n" +
" @Junk T t2 = null;\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 8)\n" +
" T t = null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull T\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in X.java (at line 9)\n" +
" @Junk T t2 = null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull T\' but the provided value is null\n" +
"----------\n");
}
// free type variable does not ensure @NonNull, but cannot accept null either, unbounded type variable
public void testTypeVariable2() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X<T> {\n" +
" void consumeAny(T t) {\n" +
" consume(t); // error, t can be null\n" +
" consumeObject(t); // error, t can be null\n" +
" }\n" +
" void consumeNullable(@Nullable T t) {\n" +
" consume(t); // error, both sides explicit, mismatch\n" +
" consumeObject(t); // error, both sides explicit, mismatch\n" +
" }\n" +
" void consume(@NonNull T t) {}\n" +
" void consumeObject(@NonNull Object o) {}\n" +
" T produce() {\n" +
" return null; // error, T may not accept null\n" +
" }\n" +
" T produceFromNullable(@Nullable T t) {\n" +
" return t; // error, T may not accept nullable\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 4)\n" +
" consume(t); // error, t can be null\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'T\' needs unchecked conversion to conform to \'@NonNull T\'\n" +
"----------\n" +
"2. WARNING in X.java (at line 5)\n" +
" consumeObject(t); // error, t can be null\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'T\' needs unchecked conversion to conform to \'@NonNull Object\'\n" +
"----------\n" +
"3. ERROR in X.java (at line 8)\n" +
" consume(t); // error, both sides explicit, mismatch\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'@NonNull T\' but this expression has type \'@Nullable T\'\n" +
"----------\n" +
"4. ERROR in X.java (at line 9)\n" +
" consumeObject(t); // error, both sides explicit, mismatch\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'@NonNull Object\' but this expression has type \'@Nullable T\'\n" +
"----------\n" +
"5. ERROR in X.java (at line 14)\n" +
" return null; // error, T may not accept null\n" +
" ^^^^\n" +
"Null type mismatch (type annotations): \'null\' is not compatible to the free type variable 'T'\n" +
"----------\n" +
"6. ERROR in X.java (at line 17)\n" +
" return t; // error, T may not accept nullable\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'T\' but this expression has type \'@Nullable T\', where \'T\' is a free type variable\n" +
"----------\n");
}
// free type variable does not ensure @NonNull, but cannot accept null either, type variable with upper bound
public void testTypeVariable3() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X<T extends Number> {\n" +
" void consumeAny(T t) {\n" +
" consume(t); // error, t can be null\n" +
" consumeObject(t); // error, t can be null\n" +
" }\n" +
" void consumeNullable(@Nullable T t) {\n" +
" consume(t); // error, both sides explicit, mismatch\n" +
" consumeObject(t); // error, both sides explicit, mismatch\n" +
" }\n" +
" void consume(@NonNull T t) {}\n" +
" void consumeObject(@NonNull Object o) {}\n" +
" T produce() {\n" +
" return null; // error, T may not accept null\n" +
" }\n" +
" T produceFromNullable(@Nullable T t) {\n" +
" return t; // error, T may not accept nullable\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 4)\n" +
" consume(t); // error, t can be null\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'T extends Number\' needs unchecked conversion to conform to \'@NonNull T extends Number\'\n" +
"----------\n" +
"2. WARNING in X.java (at line 5)\n" +
" consumeObject(t); // error, t can be null\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'T extends Number\' needs unchecked conversion to conform to \'@NonNull Object\'\n" +
"----------\n" +
"3. ERROR in X.java (at line 8)\n" +
" consume(t); // error, both sides explicit, mismatch\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'@NonNull T extends Number\' but this expression has type \'@Nullable T extends Number\'\n" +
"----------\n" +
"4. ERROR in X.java (at line 9)\n" +
" consumeObject(t); // error, both sides explicit, mismatch\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'@NonNull Object\' but this expression has type \'@Nullable T extends Number\'\n" +
"----------\n" +
"5. ERROR in X.java (at line 14)\n" +
" return null; // error, T may not accept null\n" +
" ^^^^\n" +
"Null type mismatch (type annotations): \'null\' is not compatible to the free type variable \'T\'\n" +
"----------\n" +
"6. ERROR in X.java (at line 17)\n" +
" return t; // error, T may not accept nullable\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'T\' but this expression has type \'@Nullable T extends Number\', where \'T\' is a free type variable\n" +
"----------\n");
}
// free type variable is compatible to itself even with different not null-related type annotations
public void testTypeVariable4() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.lang.annotation.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"@Target(ElementType.TYPE_USE) @interface TypeMarker {}\n" +
"public class X<T> {\n" +
" T passThrough1(@TypeMarker T t) {\n" +
" return t; // OK\n" +
" }\n" +
" @TypeMarker T passThrough2(T t) {\n" +
" return t; // OK\n" +
" }\n" +
" @TypeMarker T passThrough3(@Nullable @TypeMarker T t) {\n" +
" return t; // Not OK\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 12)\n" +
" return t; // Not OK\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'T\' but this expression has type \'@Nullable T\', where 'T' is a free type variable\n" +
"----------\n");
}
// https://bugs.eclipse.org/433906
public void testTypeVariable5() {
runConformTestWithLibs(
new String[] {
"ExFunction.java",
"@FunctionalInterface\n" +
"public interface ExFunction<T, R, E extends Exception> {\n" +
" R apply(T t1) throws E;\n" +
"\n" +
" default <V> ExFunction<V, R, E> compose(ExFunction<? super V, ? extends T, E> before) {\n" +
" java.util.Objects.requireNonNull(before);\n" +
" //warning on before.apply(v):\n" +
" //Null type safety (type annotations): The expression of type 'capture#of ? extends T' needs unchecked conversion to conform to 'T'\n" +
" return (V v) -> apply(before.apply(v));\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testSE7AnnotationCopy() { // we were dropping annotations here, but null analysis worked already since the tagbits were not "dropped", just the same capturing in a test
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.lang.annotation.ElementType;\n" +
"import java.lang.annotation.Target;\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"@Target(ElementType.TYPE_USE)\n" +
"@interface T {\n" +
"}\n" +
"public class X {\n" +
" class Y {}\n" +
" void foo(@T X.@NonNull Y p) {\n" +
" foo(null);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 10)\n" +
" foo(null);\n" +
" ^^^^\n" +
"Null type mismatch: required \'X.@NonNull Y\' but the provided value is null\n" +
"----------\n");
}
public void testWildcardCapture() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.lang.annotation.ElementType;\n" +
"import java.lang.annotation.Target;\n" +
"import java.util.ArrayList;\n" +
"import java.util.List;\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"\n" +
"@Target(ElementType.TYPE_USE)\n" +
"@interface T {\n" +
"}\n" +
"\n" +
"public class X {\n" +
" public static void main(String[] args) {\n" +
" List<X> ax = new ArrayList<X>();\n" +
" ax.add(new X());\n" +
" List<? extends X> lx = ax;\n" +
" getAdd(lx);\n" +
" }\n" +
" static <@NonNull P> void getAdd(List<P> lt) {\n" +
" lt.add(lt.get(0));\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 16)\n" +
" getAdd(lx);\n" +
" ^^\n" +
"Null type safety (type annotations): The expression of type \'List<capture#of ? extends X>\' needs unchecked conversion to conform to \'List<@NonNull capture#of ? extends X>\'\n" +
"----------\n");
}
public void testWildcardCapture2() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.lang.annotation.ElementType;\n" +
"import java.lang.annotation.Target;\n" +
"import java.util.ArrayList;\n" +
"import java.util.List;\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"\n" +
"@Target(ElementType.TYPE_USE)\n" +
"@interface T {\n" +
"}\n" +
"\n" +
"public class X {\n" +
" public static void main(String[] args) {\n" +
" List<@NonNull X> ax = new ArrayList<@NonNull X>();\n" +
" ax.add(new X());\n" +
" List<@NonNull ? extends X> lx = ax;\n" +
" getAdd(lx);\n" +
" }\n" +
" static <@NonNull P> void getAdd(List<P> lt) {\n" +
" lt.add(lt.get(0));\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testWildcardCapture3() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.lang.annotation.ElementType;\n" +
"import java.lang.annotation.Target;\n" +
"import java.util.ArrayList;\n" +
"import java.util.List;\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"@Target(ElementType.TYPE_USE)\n" +
"@interface T {\n" +
"}\n" +
"\n" +
"public class X {\n" +
" public static void main(String[] args) {\n" +
" List<@Nullable X> ax = new ArrayList<@Nullable X>();\n" +
" ax.add(new X());\n" +
" List<@Nullable ? extends X> lx = ax;\n" +
" getAdd(lx);\n" +
" }\n" +
" static <@NonNull P> void getAdd(List<P> lt) {\n" +
" lt.add(lt.get(0));\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 17)\n" +
" getAdd(lx);\n" +
" ^^\n" +
"Null type mismatch (type annotations): required \'List<@NonNull capture#of ? extends X>\' but this expression has type \'List<@Nullable capture#of ? extends X>\'\n" +
"----------\n");
}
public void testLocalArrays() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.lang.annotation.ElementType;\n" +
"import java.lang.annotation.Target;\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"@Target(ElementType.TYPE_USE)\n" +
"@interface T {\n" +
"}\n" +
"\n" +
"public class X {\n" +
" public static void main(String[] args) {\n" +
" class L {};\n" +
" L @NonNull [] @Nullable [] la = new L[5][];\n" +
" L @Nullable [] @NonNull [] la2 = new L[3][];\n" +
" la = la2;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 13)\n" +
" L @NonNull [] @Nullable [] la = new L[5][];\n" +
" ^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'L[][]\' needs unchecked conversion to conform to \'L @NonNull[] @Nullable[]\'\n" +
"----------\n" +
"2. WARNING in X.java (at line 14)\n" +
" L @Nullable [] @NonNull [] la2 = new L[3][];\n" +
" ^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'L[][]\' needs unchecked conversion to conform to \'L @Nullable[] @NonNull[]\'\n" +
"----------\n" +
"3. ERROR in X.java (at line 15)\n" +
" la = la2;\n" +
" ^^^\n" +
"Null type mismatch (type annotations): required \'L @NonNull[] @Nullable[]\' but this expression has type \'L @Nullable[] @NonNull[]\'\n" +
"----------\n");
// Without annotations.
runConformTestWithLibs(
new String[] {
"X.java",
"public class X {\n" +
" public static void main(String[] args) {\n" +
" class L {};\n" +
" L [] [] la = new L[5][];\n" +
" L [] [] la2 = new L[3][];\n" +
" la = la2;\n" +
" System.out.println(\"Done\");\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"",
"Done");
}
public void testRawType() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"public class X<T> {\n" +
" class Y <P> {}\n" +
" public static void main(String[] args) {\n" +
" @NonNull X x = null;\n" +
" X.@NonNull Y xy = null;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 5)\n" +
" @NonNull X x = null;\n" +
" ^\n" +
"X is a raw type. References to generic type X<T> should be parameterized\n" +
"----------\n" +
"2. ERROR in X.java (at line 5)\n" +
" @NonNull X x = null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull X\' but the provided value is null\n" +
"----------\n" +
"3. WARNING in X.java (at line 6)\n" +
" X.@NonNull Y xy = null;\n" +
" ^^^^^^^^^^^^\n" +
"X.Y is a raw type. References to generic type X<T>.Y<P> should be parameterized\n" +
"----------\n" +
"4. ERROR in X.java (at line 6)\n" +
" X.@NonNull Y xy = null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'X.@NonNull Y\' but the provided value is null\n" +
"----------\n");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=420456, [1.8][null] AIOOB in null analysis code.
public void test420456() {
runConformTestWithLibs(
new String[] {
"X.java",
"import java.util.Arrays;\n" +
"public class X {\n" +
" public static void main(String [] args) {\n" +
" Integer [] array = new Integer[] { 1234, 5678, 789 };\n" +
" Arrays.sort(array, Integer::compare);\n" +
" System.out.println(\"\" + array[0] + array[1] + array[2]);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"",
"78912345678");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=422134, [1.8] NPE in NullAnnotationMatching with inlined lambda expression used with a raw type
public void test422134() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.util.ArrayList;\n" +
"import java.util.Collections;\n" +
"public class X {\n" +
" public static void main(String args[]) {\n" +
" Collections.sort(new ArrayList(), (o1, o2) -> {\n" +
" return o1.compareToIgnoreCase(o1);\n" +
" });\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 5)\n" +
" Collections.sort(new ArrayList(), (o1, o2) -> {\n" +
" return o1.compareToIgnoreCase(o1);\n" +
" });\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Type safety: Unchecked invocation sort(ArrayList, (<no type> o1, <no type> o2) -> {})" +
" of the generic method sort(List<T>, Comparator<? super T>) of type Collections\n" +
"----------\n" +
"2. WARNING in X.java (at line 5)\n" +
" Collections.sort(new ArrayList(), (o1, o2) -> {\n" +
" ^^^^^^^^^^^^^^^\n" +
"Type safety: The expression of type ArrayList needs unchecked conversion to conform to List<Object>\n" +
"----------\n" +
"3. WARNING in X.java (at line 5)\n" +
" Collections.sort(new ArrayList(), (o1, o2) -> {\n" +
" ^^^^^^^^^\n" +
"ArrayList is a raw type. References to generic type ArrayList<E> should be parameterized\n" +
"----------\n" +
"4. ERROR in X.java (at line 6)\n" +
" return o1.compareToIgnoreCase(o1);\n" +
" ^^^^^^^^^^^^^^^^^^^\n" +
"The method compareToIgnoreCase(Object) is undefined for the type Object\n" +
"----------\n");
}
// should not try to analyze arguments of a polymorphic method call
public void testBug424725() {
runConformTestWithLibs(
new String[] {
"AnnotatedRecordMapper.java",
"import java.lang.invoke.MethodHandle;\n" +
"\n" +
"public final class AnnotatedRecordMapper<T> {\n" +
" private MethodHandle afterLoadStore;\n" +
"\n" +
" public void invokeAfterLoadStore(Object object, Object database) {\n" +
" if(afterLoadStore != null) {\n" +
" try {\n" +
" afterLoadStore.invoke(object, database);\n" +
" }\n" +
" catch(Throwable e) {\n" +
" throw new RuntimeException(e);\n" +
" }\n" +
" }\n" +
" }\n" +
"}"
},
null,
"");
}
public void testBug424727() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"@org.eclipse.jdt.annotation.NonNull public class X {\n" +
" static X singleton = new X();\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 1)\n" +
" @org.eclipse.jdt.annotation.NonNull public class X {\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"The nullness annotation \'NonNull\' is not applicable at this location\n" +
"----------\n");
// note: to be updated with https://bugs.eclipse.org/415918
}
public void testBug424637() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.io.IOException;\n" +
"import java.nio.file.Files;\n" +
"import java.nio.file.Path;\n" +
"import java.util.function.Function;\n" +
"import java.util.stream.Stream;\n" +
"\n" +
"public class X {\n" +
" public static void method() {\n" +
" Function<Path, Stream<Path>> method = Files::walk;\n" +
" }\n" +
"}"
},
"----------\n" +
"1. ERROR in X.java (at line 9)\n" +
" Function<Path, Stream<Path>> method = Files::walk;\n" +
" ^^^^^^^^^^^\n" +
"Unhandled exception type IOException\n" +
"----------\n");
}
public void testBug424637a() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.nio.file.FileVisitOption;\n" +
"import java.nio.file.Path;\n" +
"import java.util.function.BiFunction;\n" +
"import java.util.stream.Stream;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"interface TriFunc<A,B,C,D> { D apply(A a, B b, C c); }\n" +
"public class X {\n" +
" public static Stream<Path> myWalk(Path p, @NonNull FileVisitOption ... options) { return null; }\n" +
" public static void method() {\n" +
" BiFunction<Path, @Nullable FileVisitOption, Stream<Path>> method1 = X::myWalk;\n" + // one element varargs - nullity mismatch
" BiFunction<Path, @Nullable FileVisitOption[], Stream<Path>> method2 = X::myWalk;\n" + // pass-through array varargs - nullity mismatch
" BiFunction<Path, FileVisitOption[], Stream<Path>> method3 = X::myWalk;\n" + // pass-through array varargs - unchecked
" TriFunc<Path, @NonNull FileVisitOption, @Nullable FileVisitOption, Stream<Path>> method4 = X::myWalk;\n" + // two-element varargs - nullity mismatch on one of them
" }\n" +
"}"
},
"----------\n" +
"1. ERROR in X.java (at line 11)\n" +
" BiFunction<Path, @Nullable FileVisitOption, Stream<Path>> method1 = X::myWalk;\n" +
" ^^^^^^^^^\n" +
"Null type mismatch at parameter 2: required \'@NonNull FileVisitOption\' but provided \'@Nullable FileVisitOption\' via method descriptor BiFunction<Path,FileVisitOption,Stream<Path>>.apply(Path, FileVisitOption)\n" +
"----------\n" +
"2. ERROR in X.java (at line 12)\n" +
" BiFunction<Path, @Nullable FileVisitOption[], Stream<Path>> method2 = X::myWalk;\n" +
" ^^^^^^^^^\n" +
"Null type mismatch at parameter 2: required \'@NonNull FileVisitOption []\' but provided \'@Nullable FileVisitOption []\' via method descriptor BiFunction<Path,FileVisitOption[],Stream<Path>>.apply(Path, FileVisitOption[])\n" +
"----------\n" +
"3. WARNING in X.java (at line 13)\n" +
" BiFunction<Path, FileVisitOption[], Stream<Path>> method3 = X::myWalk;\n" +
" ^^^^^^^^^\n" +
"Null type safety: parameter 2 provided via method descriptor BiFunction<Path,FileVisitOption[],Stream<Path>>.apply(Path, FileVisitOption[]) needs unchecked conversion to conform to \'@NonNull FileVisitOption []\'\n" +
"----------\n" +
"4. ERROR in X.java (at line 14)\n" +
" TriFunc<Path, @NonNull FileVisitOption, @Nullable FileVisitOption, Stream<Path>> method4 = X::myWalk;\n" +
" ^^^^^^^^^\n" +
"Null type mismatch at parameter 3: required \'@NonNull FileVisitOption\' but provided \'@Nullable FileVisitOption\' via method descriptor TriFunc<Path,FileVisitOption,FileVisitOption,Stream<Path>>.apply(Path, FileVisitOption, FileVisitOption)\n" +
"----------\n");
}
public void testBug424637_comment3() {
runConformTestWithLibs(
new String[] {
"VarArgsMethodReferenceTest.java",
"import java.util.function.Consumer;\n" +
"public class VarArgsMethodReferenceTest {\n" +
" public static void main(String[] argv) {\n" +
" Consumer<String> printffer;\n" +
" printffer = System.out::printf;\n" +
" }\n" +
"}"
},
null,
"");
}
public void testBug427163() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" void consume(@NonNull String @Nullable... strings) {\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
""
);
}
public void testBug427163b() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" void consume1(@NonNull @Nullable String @Nullable[] strings) {}\n" +
" void consume2(@Nullable String @NonNull @Nullable... strings) {}\n" +
" void consume3(@Nullable String[] @NonNull @Nullable[] strings) {}\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 3)\n" +
" void consume1(@NonNull @Nullable String @Nullable[] strings) {}\n" +
" ^^^^^^^^^\n" +
"Contradictory null specification; only one of @NonNull and @Nullable can be specified at any location\n" +
"----------\n" +
"2. ERROR in X.java (at line 4)\n" +
" void consume2(@Nullable String @NonNull @Nullable... strings) {}\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Contradictory null specification; only one of @NonNull and @Nullable can be specified at any location\n" +
"----------\n" +
"3. ERROR in X.java (at line 5)\n" +
" void consume3(@Nullable String[] @NonNull @Nullable[] strings) {}\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Contradictory null specification; only one of @NonNull and @Nullable can be specified at any location\n" +
"----------\n"
);
}
public void testBug427163c() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" String[][] strings0 = new @NonNull String @Nullable[] @Nullable[] {};\n" +
" String[] strings1 = new String @NonNull @Nullable[] {};\n" +
" Object[] objects2 = new Object @NonNull @Nullable[1];\n" +
" String[] strings3 = new @NonNull @Nullable String [1];\n" +
" String[] strings4 = new @NonNull String @Nullable @NonNull[1];\n" +
" String[][] strings5 = new String[] @NonNull @Nullable[] {};\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" String[] strings1 = new String @NonNull @Nullable[] {};\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Contradictory null specification; only one of @NonNull and @Nullable can be specified at any location\n" +
"----------\n" +
"2. ERROR in X.java (at line 5)\n" +
" Object[] objects2 = new Object @NonNull @Nullable[1];\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Contradictory null specification; only one of @NonNull and @Nullable can be specified at any location\n" +
"----------\n" +
"3. ERROR in X.java (at line 6)\n" +
" String[] strings3 = new @NonNull @Nullable String [1];\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Contradictory null specification; only one of @NonNull and @Nullable can be specified at any location\n" +
"----------\n" +
"4. ERROR in X.java (at line 7)\n" +
" String[] strings4 = new @NonNull String @Nullable @NonNull[1];\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Contradictory null specification; only one of @NonNull and @Nullable can be specified at any location\n" +
"----------\n" +
"5. ERROR in X.java (at line 8)\n" +
" String[][] strings5 = new String[] @NonNull @Nullable[] {};\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Contradictory null specification; only one of @NonNull and @Nullable can be specified at any location\n" +
"----------\n"
);
}
// assorted tests with upper-bounded wildcards with null annotations
public void testTypeBounds1() {
runNegativeTestWithLibs(
new String[] {
"C.java",
"import java.util.List;\n" +
"\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"class A { }\n" +
"class B extends A {}\n" +
"public class C {\n" +
" \n" +
" @NonNull A testExtends(List<@NonNull B> lb1, List<@Nullable B> lb2, boolean f) {\n" +
" List<? extends @NonNull A> la1 = lb1;\n" +
" la1.add(null); // ERR1\n" +
" if (la1.size() > 0)\n" +
" return la1.get(0); // OK\n" +
" la1 = lb2; // ERR2\n" +
" List<? extends @Nullable A> la2 = lb1; // OK\n" +
" la2.add(null); // ERR3\n" +
" if (la2.size() > 0)\n" +
" return la2.get(0); // ERR4\n" +
" la2 = lb2; // OK\n" +
" if (f)\n" +
" return mExtends1(lb1); // OK, since we infer T to @NonNull B\n" +
" return mExtends2(lb1);\n" +
" }\n" +
" <T extends @Nullable A> T mExtends1(List<T> t) { return null; /*ERR5*/ }\n" +
" <T extends @NonNull A> T mExtends2(List<T> t) { return null; /*ERR6*/ }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in C.java (at line 12)\n" +
" la1.add(null); // ERR1\n" +
" ^^^^\n" +
"Null type mismatch: required \'? extends @NonNull A\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in C.java (at line 15)\n" +
" la1 = lb2; // ERR2\n" +
" ^^^\n" +
"Null type mismatch (type annotations): required \'List<? extends @NonNull A>\' but this expression has type \'List<@Nullable B>\'\n" +
"----------\n" +
"3. ERROR in C.java (at line 17)\n" +
" la2.add(null); // ERR3\n" +
" ^^^^\n" +
"Null type mismatch: required \'? extends @Nullable A\' but the provided value is null\n" +
"----------\n" +
"4. ERROR in C.java (at line 19)\n" +
" return la2.get(0); // ERR4\n" +
" ^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull A\' but this expression has type \'capture#of ? extends @Nullable A\'\n" +
"----------\n" +
"5. ERROR in C.java (at line 25)\n" +
" <T extends @Nullable A> T mExtends1(List<T> t) { return null; /*ERR5*/ }\n" +
" ^^^^\n" +
"Null type mismatch: required \'T extends @Nullable A\' but the provided value is null\n" +
"----------\n" +
"6. ERROR in C.java (at line 26)\n" +
" <T extends @NonNull A> T mExtends2(List<T> t) { return null; /*ERR6*/ }\n" +
" ^^^^\n" +
"Null type mismatch: required \'T extends @NonNull A\' but the provided value is null\n" +
"----------\n"
);
}
// assorted tests with lower-bounded wildcards with null annotations
public void testTypeBounds2() {
runNegativeTestWithLibs(
new String[] {
"C.java",
"import java.util.List;\n" +
"\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"class A { }\n" +
"class B extends A {}\n" +
"public class C {\n" +
" \n" +
" @NonNull Object testSuper(List<@Nullable A> la1, List<@NonNull A> la2, boolean f) {\n" +
" List<? super @NonNull B> lb1 = la1; // OK\n" +
" lb1.add(null); // ERR1\n" +
" if (lb1.size() > 0)\n" +
" return lb1.get(0); // ERR2\n" +
" lb1 = la2; // OK\n" +
" List<? super @Nullable B> lb2 = la1;\n" +
" lb2.add(null);\n" +
" if (lb2.size() > 0)\n" +
" return lb2.get(0); // ERR3\n" +
" lb2 = la2; // ERR4\n" +
" if (f)\n" +
" return mSuper1(la1); // ERR5\n" +
" return mSuper2(la1); // ERR6 on arg\n" +
" }\n" +
" <T extends @Nullable A> T mSuper1(List<T> t) { return null; /*ERR7*/ }\n" +
" <T extends @NonNull A> T mSuper2(List<T> t) { return null; /*ERR8*/ }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in C.java (at line 12)\n" +
" lb1.add(null); // ERR1\n" +
" ^^^^\n" +
"Null type mismatch: required \'? super @NonNull B\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in C.java (at line 14)\n" +
" return lb1.get(0); // ERR2\n" +
" ^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull Object\' but this expression has type \'capture#of ? super @NonNull B\'\n" +
"----------\n" +
"3. ERROR in C.java (at line 19)\n" +
" return lb2.get(0); // ERR3\n" +
" ^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull Object\' but this expression has type \'capture#of ? super @Nullable B\'\n" +
"----------\n" +
"4. ERROR in C.java (at line 20)\n" +
" lb2 = la2; // ERR4\n" +
" ^^^\n" +
"Null type mismatch (type annotations): required \'List<? super @Nullable B>\' but this expression has type \'List<@NonNull A>\'\n" +
"----------\n" +
"5. ERROR in C.java (at line 22)\n" +
" return mSuper1(la1); // ERR5\n" +
" ^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull Object\' but this expression has type \'@Nullable A\'\n" +
"----------\n" +
"6. ERROR in C.java (at line 23)\n" +
" return mSuper2(la1); // ERR6 on arg\n" +
" ^^^\n" +
"Null type mismatch (type annotations): required \'List<@NonNull A>\' but this expression has type \'List<@Nullable A>\'\n" +
"----------\n" +
"7. ERROR in C.java (at line 25)\n" +
" <T extends @Nullable A> T mSuper1(List<T> t) { return null; /*ERR7*/ }\n" +
" ^^^^\n" +
"Null type mismatch: required \'T extends @Nullable A\' but the provided value is null\n" +
"----------\n" +
"8. ERROR in C.java (at line 26)\n" +
" <T extends @NonNull A> T mSuper2(List<T> t) { return null; /*ERR8*/ }\n" +
" ^^^^\n" +
"Null type mismatch: required \'T extends @NonNull A\' but the provided value is null\n" +
"----------\n"
);
}
// assigning values upper bounded wildcard types carrying null annotations
public void testTypeBounds3() {
runNegativeTestWithLibs(
new String[] {
"C.java",
"import java.util.List;\n" +
"\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"class A { }\n" +
"class B extends A {}\n" +
"public class C {\n" +
" \n" +
" void testExtends(List<? extends @NonNull B> lb1, List<? extends @Nullable B> lb2) {\n" +
" List<? extends @NonNull A> la1 = lb1;\n" +
" la1 = lb2; // ERR\n" +
" List<? extends @Nullable A> la2 = lb1;\n" +
" la2 = lb2;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in C.java (at line 12)\n" +
" la1 = lb2; // ERR\n" +
" ^^^\n" +
"Null type mismatch (type annotations): required \'List<? extends @NonNull A>\' but this expression has type \'List<capture#of ? extends @Nullable B>\'\n" +
"----------\n"
);
}
// assigning values lower bounded wildcard types carrying null annotations
public void testTypeBounds4() {
runNegativeTestWithLibs(
new String[] {
"C.java",
"import java.util.List;\n" +
"\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"class A { }\n" +
"class B extends A {}\n" +
"public class C {\n" +
" \n" +
" void testSuper(List<? super @Nullable A> la1, List<? super @NonNull A> la2) {\n" +
" List<? super @NonNull B> lb1 = la1; // OK\n" +
" lb1 = la2; // OK\n" +
" List<? super @Nullable B> lb2 = la1;\n" +
" lb2 = la2; // ERR4\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in C.java (at line 14)\n" +
" lb2 = la2; // ERR4\n" +
" ^^^\n" +
"Null type mismatch (type annotations): required \'List<? super @Nullable B>\' but this expression has type \'List<capture#of ? super @NonNull A>\'\n" +
"----------\n"
);
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=429387, [1.8][compiler] AIOOBE in AbstractMethodDeclaration.createArgumentBindings
public void test429387() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.util.function.BiFunction;\n" +
"import java.util.function.Supplier;\n" +
"import java.util.function.ToIntFunction;\n" +
"import java.util.stream.IntStream;\n" +
"import java.util.stream.Stream;\n" +
"public interface X {\n" +
"static <BT, T extends BT, IS extends IntStream, E extends Exception> IntStreamy<E>\n" +
"internalFlatMapToInt(Functionish<BT, IS, E> mapper,\n" +
"Class<E> classOfE,\n" +
"Supplier<Stream<T>> maker) {\n" +
"BiFunction<Stream<T>, ToIntFunction<BT>, IntStream> func = (Stream<T> t, ToIntFunction<BT, IS> m) -> t.flatmmapToInt(m);\n" +
"return IntStreamy.fromFlatMap(func, mapper, classOfE, maker);\n" +
"}\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 7)\n" +
" static <BT, T extends BT, IS extends IntStream, E extends Exception> IntStreamy<E>\n" +
" ^^^^^^^^^^\n" +
"IntStreamy cannot be resolved to a type\n" +
"----------\n" +
"2. ERROR in X.java (at line 8)\n" +
" internalFlatMapToInt(Functionish<BT, IS, E> mapper,\n" +
" ^^^^^^^^^^^\n" +
"Functionish cannot be resolved to a type\n" +
"----------\n" +
"3. ERROR in X.java (at line 11)\n" +
" BiFunction<Stream<T>, ToIntFunction<BT>, IntStream> func = (Stream<T> t, ToIntFunction<BT, IS> m) -> t.flatmmapToInt(m);\n" +
" ^^^^^^^^^^^^^\n" +
"Incorrect number of arguments for type ToIntFunction<T>; it cannot be parameterized with arguments <BT, IS>\n" +
"----------\n" +
"4. ERROR in X.java (at line 11)\n" +
" BiFunction<Stream<T>, ToIntFunction<BT>, IntStream> func = (Stream<T> t, ToIntFunction<BT, IS> m) -> t.flatmmapToInt(m);\n" +
" ^\n" +
"m cannot be resolved to a variable\n" +
"----------\n" +
"5. ERROR in X.java (at line 12)\n" +
" return IntStreamy.fromFlatMap(func, mapper, classOfE, maker);\n" +
" ^^^^^^^^^^\n" +
"IntStreamy cannot be resolved\n" +
"----------\n");
}
public void testBug429403() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"class Person {}\n" +
"public class X {\n" +
" List<@NonNull Person> l = new ArrayList<@Nullable Person>();" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 5)\n" +
" List<@NonNull Person> l = new ArrayList<@Nullable Person>();}\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'List<@NonNull Person>\' but this expression has type \'ArrayList<@Nullable Person>\', corresponding supertype is \'List<@Nullable Person>\'\n" +
"----------\n");
}
public void testBug430219() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"@NonNullByDefault\n" +
"public class X {\n" +
" void foo(int @NonNull [] x) {}\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" void foo(int @NonNull [] x) {}\n" +
" ^^^^^^^\n" +
"NonNull cannot be resolved to a type\n" +
"----------\n");
}
public void testBug430219a() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"import java.lang.annotation.*;\n" +
"@Target(ElementType.TYPE_USE) @interface Marker{}\n" +
"@NonNullByDefault\n" +
"public class X {\n" +
" void foo(int @Marker[] x) {}\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// apply null default to type arguments:
public void testDefault01() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"@NonNullByDefault(DefaultLocation.TYPE_ARGUMENT)\n" +
"public class X {\n" +
" List<Number> test1(List<Number> in) {\n" +
" in.add(null); // ERR\n" +
" return new ArrayList<@Nullable Number>(); // ERR\n" +
" }\n" +
" java.util.List<java.lang.Number> test2(java.util.List<java.lang.Number> in) {\n" +
" in.add(null); // ERR\n" +
" return new ArrayList<java.lang.@Nullable Number>(); // ERR\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 6)\n" +
" in.add(null); // ERR\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Number\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in X.java (at line 7)\n" +
" return new ArrayList<@Nullable Number>(); // ERR\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'List<@NonNull Number>\' but this expression has type \'ArrayList<@Nullable Number>\', corresponding supertype is \'List<@Nullable Number>\'\n" +
"----------\n" +
"3. ERROR in X.java (at line 10)\n" +
" in.add(null); // ERR\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Number\' but the provided value is null\n" +
"----------\n" +
"4. ERROR in X.java (at line 11)\n" +
" return new ArrayList<java.lang.@Nullable Number>(); // ERR\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'List<@NonNull Number>\' but this expression has type \'ArrayList<@Nullable Number>\', corresponding supertype is \'List<@Nullable Number>\'\n" +
"----------\n");
}
// apply null default to type arguments - no effect on type variable or wildcard, but apply strict checking assuming nothing
public void testDefault01b() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"@NonNullByDefault(DefaultLocation.TYPE_ARGUMENT)\n" +
"public class X<T> {\n" +
" List<T> test(List<? extends Number> in) {\n" +
" in.add(null); // NOK, cannot assume nullable\n" +
" needNN(in.get(0)); // NOK, cannot assume nonnull\n" +
" return new ArrayList<@Nullable T>(); // NOK, cannot assume nullable for T in List<T>\n" +
" }\n" +
" void needNN(@NonNull Number n) {}\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 6)\n" +
" in.add(null); // NOK, cannot assume nullable\n" +
" ^^^^\n" +
"Null type mismatch (type annotations): \'null\' is not compatible to the free type variable '? extends Number'\n" +
"----------\n" +
"2. WARNING in X.java (at line 7)\n" +
" needNN(in.get(0)); // NOK, cannot assume nonnull\n" +
" ^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'capture#of ? extends Number\' needs unchecked conversion to conform to \'@NonNull Number\'\n" +
"----------\n" +
"3. ERROR in X.java (at line 8)\n" +
" return new ArrayList<@Nullable T>(); // NOK, cannot assume nullable for T in List<T>\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'List<T>\' but this expression has type \'ArrayList<@Nullable T>\', corresponding supertype is \'List<@Nullable T>\'\n" +
"----------\n");
}
// apply null default to parameters:
public void testDefault02() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault(DefaultLocation.PARAMETER)\n" +
"public class X {\n" +
" Number test1(Number in) {\n" +
" System.out.print(in.intValue()); // OK\n" +
" test1(null); // ERR\n" +
" return null; // OK\n" +
" }\n" +
" java.lang.Number test2(java.lang.Number in) {\n" +
" System.out.print(in.intValue()); // OK\n" +
" test2(null); // ERR\n" +
" return null; // OK\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 6)\n" +
" test1(null); // ERR\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Number\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in X.java (at line 11)\n" +
" test2(null); // ERR\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Number\' but the provided value is null\n" +
"----------\n");
}
// apply null default to return type - annotation at method:
public void testDefault03() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" @NonNullByDefault(DefaultLocation.RETURN_TYPE)\n" +
" Number test(Number in) {\n" +
" System.out.print(in.intValue());\n" +
" test(null); // OK\n" +
" return null; // ERR\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 7)\n" +
" return null; // ERR\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Number\' but the provided value is null\n" +
"----------\n");
}
// apply null default to field
public void testDefault04() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault(DefaultLocation.FIELD)\n" +
"public class X {\n" +
" Number field; // ERR since uninitialized\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" Number field; // ERR since uninitialized\n" +
" ^^^^^\n" +
"The @NonNull field field may not have been initialized\n" +
"----------\n");
}
// default default
public void testDefault05() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault\n" +
"public class X {\n" +
" Number field; // ERR since uninitialized\n" +
" void test1(Number[] ns) {\n" +
" ns[0] = null; // OK since not affected by default\n" +
" }\n" +
" void test2(java.lang.Number[] ns) {\n" +
" ns[0] = null; // OK since not affected by default\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" Number field; // ERR since uninitialized\n" +
" ^^^^^\n" +
"The @NonNull field field may not have been initialized\n" +
"----------\n");
}
// apply default to type parameter - inner class
public void testDefault06() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault(DefaultLocation.TYPE_PARAMETER)\n" +
"public class X {\n" +
" class Inner<T> {\n" +
" T process(T t) {\n" +
" @NonNull T t2 = t; // OK\n" +
" return null; // ERR\n" +
" }\n" +
" }\n" +
" void test(Inner<Number> inum) {\n" +
" @NonNull Number nnn = inum.process(null); // ERR on argument\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 7)\n" +
" return null; // ERR\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull T\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in X.java (at line 10)\n" +
" void test(Inner<Number> inum) {\n" +
" ^^^^^^\n" +
"Null constraint mismatch: The type \'Number\' is not a valid substitute for the type parameter \'@NonNull T\'\n" +
"----------\n" +
"3. ERROR in X.java (at line 11)\n" +
" @NonNull Number nnn = inum.process(null); // ERR on argument\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Number\' but the provided value is null\n" +
"----------\n");
}
//apply default to type parameter - class above
public void testDefault06_b() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault({DefaultLocation.TYPE_PARAMETER, DefaultLocation.TYPE_ARGUMENT})\n" +
" class Inner<T> {\n" +
" T process(T t) {\n" +
" @NonNull T t2 = t; // OK\n" +
" return null; // ERR\n" +
" }\n" +
" }\n" +
"@NonNullByDefault({DefaultLocation.TYPE_PARAMETER, DefaultLocation.TYPE_ARGUMENT})\n" +
"public class X {\n" +
" void test(Inner<Number> inum) {\n" +
" @NonNull Number nnn = inum.process(null); // ERR on argument\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 6)\n" +
" return null; // ERR\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull T\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in X.java (at line 12)\n" +
" @NonNull Number nnn = inum.process(null); // ERR on argument\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Number\' but the provided value is null\n" +
"----------\n");
}
// apply default to type bound - method in inner class
public void testDefault07() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"@NonNullByDefault(DefaultLocation.TYPE_BOUND)\n" +
"public class X {\n" +
" class Inner {\n" +
" <T extends Number> T process(T t, List<? extends Number> l) {\n" +
" @NonNull T t2 = t; // OK\n" +
" @NonNull Number n = l.get(0); // OK\n" +
" return null; // ERR\n" +
" }\n" +
" }\n" +
" void test(Inner inner) {\n" +
" @NonNull Number nnn = inner.process(Integer.valueOf(3), new ArrayList<@Nullable Integer>()); // WARN on 1. arg; ERR on 2. arg\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 9)\n" +
" return null; // ERR\n" +
" ^^^^\n" +
"Null type mismatch: required \'T extends @NonNull Number\' but the provided value is null\n" +
"----------\n" +
"2. WARNING in X.java (at line 13)\n" +
" @NonNull Number nnn = inner.process(Integer.valueOf(3), new ArrayList<@Nullable Integer>()); // WARN on 1. arg; ERR on 2. arg\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'Integer\' needs unchecked conversion to conform to \'@NonNull Integer\'\n" +
"----------\n" +
"3. ERROR in X.java (at line 13)\n" +
" @NonNull Number nnn = inner.process(Integer.valueOf(3), new ArrayList<@Nullable Integer>()); // WARN on 1. arg; ERR on 2. arg\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'List<? extends @NonNull Number>\' but this expression has type \'ArrayList<@Nullable Integer>\', corresponding supertype is \'List<@Nullable Integer>\'\n" +
"----------\n");
}
//apply null default to type arguments:
public void testDefault01_bin() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"import java.lang.annotation.*;\n" +
"\n" +
"@Target(ElementType.TYPE_USE) @Retention(RetentionPolicy.CLASS) @interface Important {}\n" +
"\n" +
"@NonNullByDefault(DefaultLocation.TYPE_ARGUMENT)\n" +
"public class X {\n" +
" List<Number> test1(List<@Important Number> in) {\n" +
" return new ArrayList<@NonNull Number>();\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
runNegativeTestWithLibs(
new String[] {
"Y.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"public class Y {\n" +
" void test(List<Number> in, X x) {\n" +
" x.test1(new ArrayList<@Nullable Number>()) // ERR at arg\n" +
" .add(null); // ERR\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Y.java (at line 5)\n" +
" x.test1(new ArrayList<@Nullable Number>()) // ERR at arg\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'List<@NonNull Number>\' but this expression has type \'ArrayList<@Nullable Number>\', corresponding supertype is \'List<@Nullable Number>\'\n" +
"----------\n" +
"2. ERROR in Y.java (at line 6)\n" +
" .add(null); // ERR\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Number\' but the provided value is null\n" +
"----------\n");
}
//apply null default to parameters:
public void testDefault02_bin() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault(DefaultLocation.PARAMETER)\n" +
"public class X {\n" +
" Number test1(Number in) {\n" +
" return null; // OK\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
runNegativeTestWithLibs(
new String[] {
"Y.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class Y {\n" +
" @NonNull Number test(X x) {\n" +
" return x.test1(null); // error at arg, unchecked at return\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in Y.java (at line 4)\n" +
" return x.test1(null); // error at arg, unchecked at return\n" +
" ^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'Number\' needs unchecked conversion to conform to \'@NonNull Number\'\n" +
"----------\n" +
"2. ERROR in Y.java (at line 4)\n" +
" return x.test1(null); // error at arg, unchecked at return\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Number\' but the provided value is null\n" +
"----------\n");
}
//apply null default to return type - annotation at method:
public void testDefault03_bin() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" @NonNullByDefault(DefaultLocation.RETURN_TYPE)\n" +
" Number test(Number in) {\n" +
" return new Integer(13);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
runConformTestWithLibs(
new String[] {
"Y.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class Y {\n" +
" @NonNull Number test(X x) {\n" +
" return x.test(null); // both OK\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// apply null default to field - also test mixing of explicit annotation with default @NonNull (other annot is not rendered in error)
public void testDefault04_bin() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.lang.annotation.*;\n" +
"@Target(ElementType.TYPE_USE) @Retention(RetentionPolicy.CLASS) @interface Important {}\n" +
"@NonNullByDefault(DefaultLocation.FIELD)\n" +
"public class X {\n" +
" @Important Number field = new Double(1.1d);\n" +
"}\n"
},
getCompilerOptions(),
"");
runNegativeTestWithLibs(
new String[] {
"Y.java",
"public class Y {\n" +
" void test(X x) {\n" +
" x.field = null; // ERR\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Y.java (at line 3)\n" +
" x.field = null; // ERR\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Number\' but the provided value is null\n" +
"----------\n");}
// default default
public void testDefault05_bin() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault\n" +
"public class X {\n" +
" Number field = new Long(13);\n" +
" void test1(Number[] ns) {\n" +
" ns[0] = null; // OK since not affected by default\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
runNegativeTestWithLibs(
new String[] {
"Y.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class Y {\n" +
" void test(X x, @Nullable Number @NonNull[] ns) {\n" +
" x.test1(ns); // OK since not affected by default\n" +
" x.field = null; // ERR\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Y.java (at line 5)\n" +
" x.field = null; // ERR\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Number\' but the provided value is null\n" +
"----------\n");}
// apply default to type parameter - inner class
public void testDefault06_bin() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault(DefaultLocation.TYPE_PARAMETER)\n" +
"public class X {\n" +
" static class Inner<T> {\n" +
" T process(T t) {\n" +
" return t;\n" +
" }\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
runNegativeTestWithLibs(
new String[] {
"Y.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class Y {\n" +
" void test(X.Inner<Number> inum) { // illegal substitution\n" +
" @NonNull Number nnn = inum.process(null); // ERR on argument\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Y.java (at line 3)\n" +
" void test(X.Inner<Number> inum) { // illegal substitution\n" +
" ^^^^^^\n" +
"Null constraint mismatch: The type \'Number\' is not a valid substitute for the type parameter \'@NonNull T extends Object\'\n" +
"----------\n" +
"2. ERROR in Y.java (at line 4)\n" +
" @NonNull Number nnn = inum.process(null); // ERR on argument\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Number\' but the provided value is null\n" +
"----------\n");}
// apply default to type bound - method in inner class
public void testDefault07_bin() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"@NonNullByDefault(DefaultLocation.TYPE_BOUND)\n" +
"public class X {\n" +
" static class Inner {\n" +
" <T extends Number> T process(T t, List<? extends Number> l) {\n" +
" return t;\n" +
" }\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
runNegativeTestWithLibs(
new String[] {
"Y.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"public class Y {\n" +
" void test(X.Inner inner) {\n" +
" @NonNull Number nnn = inner.process(Integer.valueOf(3), new ArrayList<@Nullable Integer>()); // WARN on 1. arg; ERR on 2. arg\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in Y.java (at line 5)\n" +
" @NonNull Number nnn = inner.process(Integer.valueOf(3), new ArrayList<@Nullable Integer>()); // WARN on 1. arg; ERR on 2. arg\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'Integer\' needs unchecked conversion to conform to \'@NonNull Integer\'\n" +
"----------\n" +
"2. ERROR in Y.java (at line 5)\n" +
" @NonNull Number nnn = inner.process(Integer.valueOf(3), new ArrayList<@Nullable Integer>()); // WARN on 1. arg; ERR on 2. arg\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'List<? extends @NonNull Number>\' but this expression has type \'ArrayList<@Nullable Integer>\', corresponding supertype is \'List<@Nullable Integer>\'\n" +
"----------\n");
}
public void testBug431269() {
runNegativeTestWithLibs(
new String[] {
"p/QField.java",
"package p;\n" +
"\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class QField<R extends QField<R, ? >, T> {\n" +
" @NonNull\n" +
" protected R m_root;\n" +
"\n" +
" public QField(@Nullable R root, @Nullable QField<R, ? > parent, @Nullable String propertyNameInParent) {\n" +
" m_root = root;\n" +
" }\n" +
"}\n",
"p/PLogLine.java",
"package p;\n" +
"\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class PLogLine<R extends QField<R, ? >> extends QField<R, LogLine> {\n" +
" public PLogLine(@Nullable R root, @Nullable QField<R, ? > parent, @Nullable String name) {\n" +
" super(root, parent, name);\n" +
" }\n" +
"\n" +
" @NonNull\n" +
" public final QField<R, java.lang.String> lastName() {\n" +
" return new QField<R, java.lang.Long>(m_root, this, \"lastName\");\n" +
" }\n" +
"\n" +
"}\n",
"p/LogLine.java",
"package p;\n" +
"\n" +
"public class LogLine {\n" +
" private String m_lastName;\n" +
"\n" +
" public String getLastName() {\n" +
" return m_lastName;\n" +
" }\n" +
"\n" +
" public void setLastName(String property) {\n" +
" m_lastName = property;\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in p\\QField.java (at line 10)\n" +
" m_root = root;\n" +
" ^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull R extends QField<R extends QField<R,?>,?>\' but this expression has type \'@Nullable R extends QField<R extends QField<R,?>,?>\'\n" +
"----------\n" +
"----------\n" +
"1. ERROR in p\\PLogLine.java (at line 12)\n" +
" return new QField<R, java.lang.Long>(m_root, this, \"lastName\");\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Type mismatch: cannot convert from QField<R,Long> to QField<R,String>\n" +
"----------\n");
}
// was inferring null type annotations too aggressively
public void testBug432223() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" String val;\n" +
" public static @NonNull <T> T assertNotNull(@Nullable T object) {\n" +
" return assertNotNull(null, object);\n" +
" }\n" +
"\n" +
" public static @NonNull <T> T assertNotNull(@Nullable String message, @Nullable T object) {\n" +
" if (object == null) {\n" +
" throw new NullPointerException(message);\n" +
" }\n" +
" return object;\n" +
" }\n" +
" void test(@Nullable X x) {\n" +
" @NonNull X safe = assertNotNull(x);\n" +
" System.out.println(safe.val);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug432977() {
runConformTestWithLibs(
new String[] {
"Bar.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault\n" +
"public class Bar {\n" +
" private String prop = \"\";\n" +
"\n" +
" public String getProp() {\n" +
" return prop;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
runConformTestWithLibs(
new String[] {
"Fu.java",
"public class Fu {\n" +
" private Bar fubar = new Bar();\n" +
" \n" +
" public void method() {\n" +
" fubar.getProp().equals(\"\");\n" +
" } \n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug433586() {
runConformTestWithLibs(
new String[] {
"NullConversionWarning.java",
"import java.util.function.Consumer;\n" +
"public class NullConversionWarning<T> {\n" +
"\n" +
" public Consumer<T> peek2(Consumer<? super T> action) {\n" +
" // Null type safety: parameter 1 provided via\n" +
" // method descriptor Consumer<T>.accept(T) needs\n" +
" // unchecked conversion to conform to 'capture#of ? super T'\n" +
" Consumer<T> action2 = action::accept;\n" +
" return action2;\n" +
" }\n" +
" void foo(Consumer<? super T> action, T t) {\n" +
" Consumer<T> action2 = t2 -> action.accept(t2);\n" +
" action.accept(t);\n" +
" action2.accept(t);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// NPE without the fix.
public void testBug433478() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"@NonNullByDefault class Y { }\n" +
"\n" +
"interface I<T> {\n" +
" @Nullable T foo();\n" +
"}\n" +
"\n" +
"@NonNullByDefault \n" +
"class X implements I<Y> {\n" +
" @Override\n" +
" public Y foo() {\n" +
" return null;\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 14)\n" +
" return null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Y\' but the provided value is null\n" +
"----------\n");
}
// https://bugs.eclipse.org/434899
public void testTypeVariable6() {
runNegativeTestWithLibs(
new String[] {
"Assert.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class Assert {\n" +
" public static void caller() {\n" +
" assertNotNull(\"not null\"); // Compiler error\n" +
" assertNotNull(null); // Compiler error\n" +
" }\n" +
" private static @NonNull <T> T assertNotNull(@Nullable T object) {\n" +
" return object; // this IS bogus\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Assert.java (at line 8)\n" +
" return object; // this IS bogus\n" +
" ^^^^^^\n" +
"Null type mismatch (type annotations): required \'@NonNull T\' but this expression has type \'@Nullable T\'\n" +
"----------\n");
}
// https://bugs.eclipse.org/434899 - variant which has always worked
public void testTypeVariable6a() {
runConformTestWithLibs(
new String[] {
"Assert.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class Assert {\n" +
" public static Object caller() {\n" +
" @NonNull Object result = assertNotNull(\"not null\");\n" +
" result = assertNotNull(null);\n" +
" return result;\n" +
" }\n" +
" private static @NonNull <T> T assertNotNull(@Nullable T object) {\n" +
" if (object == null) throw new NullPointerException();\n" +
" return object;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// Bug 438458 - [1.8][null] clean up handling of null type annotations wrt type variables
// - type parameter with explicit nullness, cannot infer otherwise
public void testTypeVariable7() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface I1 <@NonNull T> { T get(); }\n" +
"public class X {\n" +
" <U> U m(I1<U> in) { return in.get(); }\n" +
" public void test(I1<@NonNull String> in) {\n" +
" @NonNull String s = m(in);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" <U> U m(I1<U> in) { return in.get(); }\n" +
" ^\n" +
"Null constraint mismatch: The type \'U\' is not a valid substitute for the type parameter \'@NonNull T\'\n" +
"----------\n");
}
// Bug 438458 - [1.8][null] clean up handling of null type annotations wrt type variables
// - type parameter with explicit nullness, nullness must not spoil inference
public void testTypeVariable7a() {
Map compilerOptions = getCompilerOptions();
compilerOptions.put(JavaCore.COMPILER_PB_NULL_SPECIFICATION_VIOLATION, JavaCore.WARNING); // allow ignoring bad substitution
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface I1 <@NonNull T> { T get(); }\n" +
"public class X {\n" +
" <U> U m(I1<U> in) { return in.get(); }\n" +
" public void test1() {\n" +
" @Nullable String s = m(() -> \"OK\");\n" +
" System.out.println(s);\n" +
" }\n" +
" public static void main(String[] args) {\n" +
" new X().test1();\n" +
" }\n" +
"}\n"
},
compilerOptions,
"----------\n" +
"1. WARNING in X.java (at line 4)\n" +
" <U> U m(I1<U> in) { return in.get(); }\n" +
" ^\n" +
"Null constraint mismatch: The type \'U\' is not a valid substitute for the type parameter \'@NonNull T\'\n" +
"----------\n",
"OK");
}
// Bug 438458 - [1.8][null] clean up handling of null type annotations wrt type variables
// - type parameter with explicit nullness, nullness must not spoil inference
public void testTypeVariable7err() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface I1 <@Nullable T> { T get(); }\n" +
"public class X {\n" +
" <U> U m(I1<U> in) { return in.get(); }\n" +
" public void test1() {\n" +
" @NonNull String s = m(() -> \"\");\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" <U> U m(I1<U> in) { return in.get(); }\n" +
" ^\n" +
"Null constraint mismatch: The type \'U\' is not a valid substitute for the type parameter \'@Nullable T\'\n" +
"----------\n" +
"2. ERROR in X.java (at line 4)\n" +
" <U> U m(I1<U> in) { return in.get(); }\n" +
" ^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'U\' but this expression has type \'@Nullable U\', where \'U\' is a free type variable\n" +
"----------\n" +
"3. WARNING in X.java (at line 6)\n" +
" @NonNull String s = m(() -> \"\");\n" +
" ^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String\' needs unchecked conversion to conform to \'@NonNull String\'\n" +
"----------\n");
}
//Bug 435570 - [1.8][null] @NonNullByDefault illegally tries to affect "throws E"
public void testTypeVariable8() {
runConformTestWithLibs(
new String[] {
"Test.java",
"@org.eclipse.jdt.annotation.NonNullByDefault\n" +
"public class Test<E extends Exception> {\n" +
" void test() throws E {}\n" + // was: Nullness annotations are not applicable at this location
"}\n"
},
getCompilerOptions(),
"");
}
// Bug 438012 - Bogus Warning: The nullness annotation is redundant with a default that applies to this location
public void testTypeVariable9() {
runConformTestWithLibs(
new String[] {
"Bar.java",
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"import static org.eclipse.jdt.annotation.DefaultLocation.*;\n" +
"\n" +
"@NonNullByDefault({ PARAMETER, RETURN_TYPE, FIELD, TYPE_BOUND, TYPE_ARGUMENT, TYPE_PARAMETER })\n" +
"interface Bar<V> {\n" +
" V getV(V in);\n" +
" void setV(V v);\n" +
"}"
},
getCompilerOptions(),
"");
}
// Bug 439516 - [1.8][null] NonNullByDefault wrongly applied to implicit type bound of binary type
public void testTypeVariable10() {
runConformTestWithLibs(
new String[] {
"X.java",
"@org.eclipse.jdt.annotation.NonNullByDefault\n" +
"public class X<T> {\n" +
" void test(T t) {}\n" +
"}\n"
},
getCompilerOptions(),
"");
runConformTestWithLibs(
false,
new String[] {
"Y.java",
"public class Y {\n" +
" void foo(X<@org.eclipse.jdt.annotation.Nullable String> xs) {\n" +
" xs.test(null);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// Bug 439516 - [1.8][null] NonNullByDefault wrongly applied to implicit type bound of binary type
// Problem 1 from: Bug 438971 - [1.8][null] @NonNullByDefault/@Nullable on parameter of generic interface
public void testTypeVariable10a() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault\n" +
"public class X<T> {\n" +
" void test(@Nullable T t) {}\n" +
"}\n"
},
getCompilerOptions(),
"");
runConformTestWithLibs(
false,
new String[] {
"Y.java",
"public class Y {\n" +
" void foo(X<String> xs) {\n" +
" xs.test(\"OK\");\n" + // was: Contradictory null annotations: method was inferred as ...
" xs.test(null);\n" + // was: Contradictory null annotations: method was inferred as ...
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// Bug 439516 - [1.8][null] NonNullByDefault wrongly applied to implicit type bound of binary type
// warning for explicit "<T extends Object>"
public void testTypeVariable11() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.DefaultLocation;\n" +
"@org.eclipse.jdt.annotation.NonNullByDefault({DefaultLocation.TYPE_BOUND})\n" + // not: PARAMETER
"public class X<T extends Object> {\n" +
" void test(T t) {}\n" +
"}\n",
"Y.java",
"public class Y {\n" +
" void foo(X<@org.eclipse.jdt.annotation.Nullable String> xs) {\n" +
" xs.test(null);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 3)\n" +
" public class X<T extends Object> {\n" +
" ^^^^^^\n" +
"The explicit type bound \'Object\' is not affected by the nullness default for DefaultLocation.TYPE_BOUND.\n" +
"----------\n");
}
// Bug 438179 - [1.8][null] 'Contradictory null annotations' error on type variable with explicit null-annotation.
public void testTypeVariable12() {
runConformTestWithLibs(
new String[] {
"Test.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault\n" +
"public class Test {\n" +
" private Fu<String> fu = new Fu<>();\n" +
" public void foo() {\n" +
" fu.method(); // 'Contradictory null annotations' error\n" +
" }\n" +
"}\n" +
"class Fu<T> {\n" +
" @Nullable T method() {\n" +
" return null;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// Bug 438250 - [1.8][null] NPE trying to report bogus null annotation conflict
public void testTypeVariable13() {
runConformTestWithLibs(
new String[] {
"FooBar.java",
"@org.eclipse.jdt.annotation.NonNullByDefault(org.eclipse.jdt.annotation.DefaultLocation.TYPE_BOUND)\n" +
"public interface FooBar {\n" +
" <@org.eclipse.jdt.annotation.Nullable R extends Runnable> R foobar(R r);\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// Bug 438469 - [null] How-to use null type annotations with generic methods from interfaces in some library you only have as binary JAR?
public void testTypeVariable14() {
runConformTestWithLibs(
new String[] {
"ITest.java",
"interface ITest {\n" +
" <T> T foo(T arg); // or arg Class<T> or TypeToken<T> + return TypeAdapter<T>, etc.\n" +
"}"
},
getCompilerOptions(),
"");
Map options = getCompilerOptions();
options.put(JavaCore.COMPILER_PB_SUPPRESS_OPTIONAL_ERRORS, JavaCore.ENABLED);
runConformTestWithLibs(
false,
new String[] {
"Test.java",
"class Test implements ITest {\n" +
" @Override\n" +
" @SuppressWarnings(\"null\")\n" +
" public <T> @org.eclipse.jdt.annotation.Nullable T foo(T arg) {\n" +
" return null;\n" +
" }\n" +
"}\n"
},
options,
"");
}
// Bug 438467 - [compiler][null] Better error position for "The method _ cannot implement the corresponding method _ due to incompatible nullness constraints"
public void testTypeVariable15() {
runNegativeTestWithLibs(
new String[] {
"ITest.java",
"interface ITest {\n" +
" <T> T foo(T arg); // or arg Class<T> or TypeToken<T> + return TypeAdapter<T>, etc.\n" +
"}",
"Test.java",
"class Test implements ITest {\n" +
" @Override\n" +
" public <T> @org.eclipse.jdt.annotation.Nullable T foo(T arg) {\n" +
" return null;\n" +
" }\n" +
"}\n",
"Test2.java",
"class Test2 implements ITest {\n" +
" @Override\n" +
" public <T> T foo(@org.eclipse.jdt.annotation.NonNull T arg) {\n" +
" return arg;\n" +
" }\n" +
"}\n",
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Test.java (at line 3)\n" +
" public <T> @org.eclipse.jdt.annotation.Nullable T foo(T arg) {\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"The return type is incompatible with the free type variable 'T' returned from ITest.foo(T) (mismatching null constraints)\n" +
"----------\n" +
"----------\n" +
"1. ERROR in Test2.java (at line 3)\n" +
" public <T> T foo(@org.eclipse.jdt.annotation.NonNull T arg) {\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Illegal redefinition of parameter arg, inherited method from ITest does not constrain this parameter\n" +
"----------\n");
}
// Bug 438467 - [compiler][null] Better error position for "The method _ cannot implement the corresponding method _ due to incompatible nullness constraints"
public void testTypeVariable15a() {
runNegativeTestWithLibs(
new String[] {
"ITest.java",
"import java.util.List;\n" +
"interface ITest {\n" +
" <T> T foo(List<T> arg); // or arg Class<T> or TypeToken<T> + return TypeAdapter<T>, etc.\n" +
"}",
"Test.java",
"import java.util.List;\n" +
"class Test implements ITest {\n" +
" @Override\n" +
" public <T> T foo(List<@org.eclipse.jdt.annotation.NonNull T> arg) {\n" +
" return arg.get(0);\n" +
" }\n" +
"}\n",
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Test.java (at line 4)\n" +
" public <T> T foo(List<@org.eclipse.jdt.annotation.NonNull T> arg) {\n" +
" ^^^^\n" +
"Illegal redefinition of parameter arg, inherited method from ITest declares this parameter as \'List<T>\' (mismatching null constraints)\n" +
"----------\n");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=434602
// Possible error with inferred null annotations leading to contradictory null annotations
public void testTypeVariable16() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"class Y { void doit() {} }\n" +
"@NonNullByDefault\n" +
"class X {\n" +
" void foo() {\n" +
" X x = new X();\n" +
" Y y = x.bar(); // Error: Contradictory null annotations before the fix\n" +
" y.doit(); // check that @Nullable from bar's declaration has effect on 'y'\n" +
" }\n" +
"\n" +
" public <T extends Y> @Nullable T bar() {\n" +
" return null;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 10)\n" +
" y.doit(); // check that @Nullable from bar's declaration has effect on 'y'\n" +
" ^\n" +
"Potential null pointer access: The variable y may be null at this location\n" +
"----------\n");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=434602
// Possible error with inferred null annotations leading to contradictory null annotations
// Method part of parameterized class.
public void testTypeVariable16a() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"class Y {}\n" +
"@NonNullByDefault\n" +
"public class X <T> {\n" +
" void foo() {\n" +
" X<Y> x = new X<Y>();\n" +
" x.bar(); // Error: Contradictory null annotations before the fix\n" +
" }\n" +
"\n" +
" public @Nullable T bar() {\n" +
" return null;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testTypeVariable16b() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.Nullable;\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"\n" +
"class Y {}\n" +
"class Y2 extends Y {}\n" +
"\n" +
"class X {\n" +
" void foo() {\n" +
" X x = new X();\n" +
" x.bar(null); // null arg is illegal\n" +
" }\n" +
" public <T extends @NonNull Y> @Nullable T bar(T t) {\n" +
" return null; // OK\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 10)\n" +
" x.bar(null); // null arg is illegal\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Y\' but the provided value is null\n" +
"----------\n");
}
// Bug 440143 - [1.8][null] one more case of contradictory null annotations regarding type variables
public void testTypeVariable17() {
runNegativeTestWithLibs(
new String[] {
"Test7.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class Test7<@Nullable E> {\n" +
" E e;\n" +
"\n" +
" @Nullable\n" +
" E test() {\n" +
" return null;\n" +
" }\n" +
"\n" +
" @NonNull\n" +
" E getNotNull() {\n" +
" if (e == null)\n" +
" throw new NullPointerException();\n" +
" return e;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Test7.java (at line 15)\n" +
" return e;\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'@NonNull E\' but this expression has type \'@Nullable E\'\n" +
"----------\n");
}
// Bug 440143 - [1.8][null] one more case of contradictory null annotations regarding type variables
// use local variable to avoid the null type mismatch
public void testTypeVariable17a() {
runConformTestWithLibs(
new String[] {
"Test7.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class Test7<@Nullable E> {\n" +
" E e;\n" +
"\n" +
" @Nullable\n" +
" E test() {\n" +
" return null;\n" +
" }\n" +
"\n" +
" @NonNull\n" +
" E getNotNull() {\n" +
" E el = e;\n" +
" if (el == null)\n" +
" throw new NullPointerException();\n" +
" return el;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// NPE reported in https://bugs.eclipse.org/bugs/show_bug.cgi?id=438458#c5
public void testTypeVariable18() {
runNegativeTestWithLibs(
new String[] {
"Test.java",
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"interface Lib1 {\n" +
" <T extends Collection<?>> T constrainedTypeParameter(@NonNull T in);\n" +
"}\n" +
"\n" +
"public class Test {\n" +
" @NonNull Collection<?> test4(Lib1 lib, @Nullable Collection<String> in) {\n" +
" return lib.constrainedTypeParameter(in);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in Test.java (at line 10)\n" +
" return lib.constrainedTypeParameter(in);\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'Collection<String>\' needs unchecked conversion to conform to \'@NonNull Collection<?>\'\n" +
"----------\n" +
"2. ERROR in Test.java (at line 10)\n" +
" return lib.constrainedTypeParameter(in);\n" +
" ^^\n" +
"Null type mismatch (type annotations): required \'@NonNull Collection<String>\' but this expression has type \'@Nullable Collection<String>\'\n" +
"----------\n");
}
public void testTypeVariable18raw() {
runNegativeTestWithLibs(
new String[] {
"Test.java",
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"interface Lib1 {\n" +
" <T extends Collection<?>> T constrainedTypeParameter(@NonNull T in);\n" +
"}\n" +
"\n" +
"public class Test {\n" +
" @SuppressWarnings(\"rawtypes\")\n" +
" @NonNull Collection test4(Lib1 lib, @Nullable Collection in) {\n" +
" return lib.constrainedTypeParameter(in);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in Test.java (at line 11)\n" +
" return lib.constrainedTypeParameter(in);\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'Collection\' needs unchecked conversion to conform to \'@NonNull Collection\'\n" +
"----------\n" +
"2. ERROR in Test.java (at line 11)\n" +
" return lib.constrainedTypeParameter(in);\n" +
" ^^\n" +
"Null type mismatch (type annotations): required \'@NonNull Collection\' but this expression has type \'@Nullable Collection\'\n" +
"----------\n");
}
// top-level annotation is overridden at use-site, details remain - parameterized type
public void testTypeVariable19() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.util.ArrayList;\n" +
"import java.util.List;\n" +
"\n" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"interface I<T,U extends List<T>> {\n" +
" U get0();\n" +
" @Nullable U get1();\n" +
" @NonNull U get2();\n" +
"}\n" +
"class X {\n" +
" static String test (I<@Nullable String, @NonNull ArrayList<@Nullable String>> i1,\n" +
" I<@NonNull String, @Nullable ArrayList<@NonNull String>> i2, int s) {\n" +
" switch(s) {\n" +
" case 0 : return i1.get0().get(0).toUpperCase(); // problem at detail\n" +
" case 1 : return i1.get1().get(0).toUpperCase(); // 2 problems\n" +
" case 2 : return i1.get2().get(0).toUpperCase(); // problem at detail\n" +
" case 3 : return i2.get0().get(0).toUpperCase(); // problem at top\n" +
" case 4 : return i2.get1().get(0).toUpperCase(); // problem at top\n" +
" case 5 : return i2.get2().get(0).toUpperCase(); // OK\n" +
" default : return \"\";" +
" }\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 15)\n" +
" case 0 : return i1.get0().get(0).toUpperCase(); // problem at detail\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Potential null pointer access: The method get(int) may return null\n" +
"----------\n" +
"2. ERROR in X.java (at line 16)\n" +
" case 1 : return i1.get1().get(0).toUpperCase(); // 2 problems\n" +
" ^^^^^^^^^\n" +
"Potential null pointer access: The method get1() may return null\n" +
"----------\n" +
"3. ERROR in X.java (at line 16)\n" +
" case 1 : return i1.get1().get(0).toUpperCase(); // 2 problems\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Potential null pointer access: The method get(int) may return null\n" +
"----------\n" +
"4. ERROR in X.java (at line 17)\n" +
" case 2 : return i1.get2().get(0).toUpperCase(); // problem at detail\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Potential null pointer access: The method get(int) may return null\n" +
"----------\n" +
"5. ERROR in X.java (at line 18)\n" +
" case 3 : return i2.get0().get(0).toUpperCase(); // problem at top\n" +
" ^^^^^^^^^\n" +
"Potential null pointer access: The method get0() may return null\n" +
"----------\n" +
"6. ERROR in X.java (at line 19)\n" +
" case 4 : return i2.get1().get(0).toUpperCase(); // problem at top\n" +
" ^^^^^^^^^\n" +
"Potential null pointer access: The method get1() may return null\n" +
"----------\n");
}
// top-level annotation is overridden at use-site, array with anotations on dimensions
public void testTypeVariable19a() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"interface I1<T> {\n" +
" T @Nullable[] get0();\n" +
" @Nullable T @NonNull[] get1();\n" +
" @Nullable T @Nullable[] get2();\n" +
"}\n" +
"interface I2<T> {\n" +
" T @NonNull[] get0();\n" +
" @NonNull T @NonNull[] get1();\n" +
" @NonNull T @Nullable[] get2();\n" +
"}\n" +
"class X {\n" +
" static String test (I1<@NonNull String> i1, I2<@Nullable String> i2, int s) {\n" +
" switch (s) {\n" +
" case 0: return i1.get0()[0].toUpperCase(); // problem on array\n" +
" case 1: return i1.get1()[0].toUpperCase(); // problem on element\n" +
" case 2: return i1.get2()[0].toUpperCase(); // 2 problems\n" +
" case 3: return i2.get0()[0].toUpperCase(); // problem on element\n" +
" case 4: return i2.get1()[0].toUpperCase(); // OK\n" +
" case 5: return i2.get2()[0].toUpperCase(); // problem on array\n" +
" default: return \"\";\n" +
" }\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 16)\n" +
" case 0: return i1.get0()[0].toUpperCase(); // problem on array\n" +
" ^^^^^^^^^\n" +
"Potential null pointer access: The method get0() may return null\n" +
"----------\n" +
"2. ERROR in X.java (at line 17)\n" +
" case 1: return i1.get1()[0].toUpperCase(); // problem on element\n" +
" ^^^^^^^^^^^^\n" +
"Potential null pointer access: array element may be null\n" +
"----------\n" +
"3. ERROR in X.java (at line 18)\n" +
" case 2: return i1.get2()[0].toUpperCase(); // 2 problems\n" +
" ^^^^^^^^^\n" +
"Potential null pointer access: The method get2() may return null\n" +
"----------\n" +
"4. ERROR in X.java (at line 18)\n" +
" case 2: return i1.get2()[0].toUpperCase(); // 2 problems\n" +
" ^^^^^^^^^^^^\n" +
"Potential null pointer access: array element may be null\n" +
"----------\n" +
"5. ERROR in X.java (at line 19)\n" +
" case 3: return i2.get0()[0].toUpperCase(); // problem on element\n" +
" ^^^^^^^^^^^^\n" +
"Potential null pointer access: array element may be null\n" +
"----------\n" +
"6. ERROR in X.java (at line 21)\n" +
" case 5: return i2.get2()[0].toUpperCase(); // problem on array\n" +
" ^^^^^^^^^\n" +
"Potential null pointer access: The method get2() may return null\n" +
"----------\n");
}
public void testBug434600() {
runConformTestWithLibs(
new String[] {
"bug/Main.java",
"package bug;\n" +
"public class Main {\n" +
" public static void main(final String[] args) {\n" +
" System.out.println(\"Hello World\");\n" +
" }\n" +
"}\n",
"bug/package-info.java",
"@org.eclipse.jdt.annotation.NonNullByDefault\n" +
"package bug;\n",
"bug/ExpressionNode.java",
"package bug;\n" +
"\n" +
"public interface ExpressionNode extends CopyableNode<ExpressionNode> {\n" +
" \n" +
"}\n",
"bug/ExtendedNode.java",
"package bug;\n" +
"\n" +
"public interface ExtendedNode {\n" +
" \n" +
"}\n",
"bug/CopyableNode.java",
"package bug;\n" +
"\n" +
"public interface CopyableNode<T extends ExtendedNode> extends ExtendedNode {\n" +
" \n" +
"}\n"
},
getCompilerOptions(),
"",
"Hello World");
}
public void testBug434600a() {
runConformTestWithLibs(
new String[] {
"I.java",
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"interface I<S, T extends @Nullable List<@NonNull List<S>>> {\n" +
"}\n",
"C.java",
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public class C implements I<@Nullable String, @Nullable ArrayList<@NonNull List<@Nullable String>>> {}\n"
},
getCompilerOptions(),
"");
}
public void testBug434600a_qualified() {
runConformTestWithLibs(
new String[] {
"p/I.java",
"package p;\n" +
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public interface I<S, T extends @Nullable List<@NonNull List<S>>> {\n" +
"}\n",
"C.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class C implements p.I<java.lang.@Nullable String, java.util.@Nullable ArrayList<java.util.@NonNull List<java.lang.@Nullable String>>> {}\n"
},
getCompilerOptions(),
"");
}
public void testBug434600b() {
runNegativeTestWithLibs(
new String[] {
"I.java",
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"interface I<S, T extends @Nullable List<@NonNull List<S>>> {\n" +
"}\n",
"C.java",
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public class C implements I<@Nullable String, ArrayList<@NonNull List<@Nullable String>>> {}\n" +
"class C1 {\n" +
" I<String, @Nullable ArrayList<@Nullable List<String>>> field;\n" +
"}\n" +
"class C2 implements I<@NonNull String, @Nullable ArrayList<@NonNull List<@Nullable String>>> {}\n" // FIXME: cross checking for contradictory substitution for 'S' NYI
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in C.java (at line 3)\n" +
" public class C implements I<@Nullable String, ArrayList<@NonNull List<@Nullable String>>> {}\n" +
" ^^^^^^^^^\n" +
"Null constraint mismatch: The type \'ArrayList<@NonNull List<@Nullable String>>\' is not a valid substitute for the type parameter \'T extends @Nullable List<@NonNull List<S>>\'\n" +
"----------\n" +
"2. ERROR in C.java (at line 5)\n" +
" I<String, @Nullable ArrayList<@Nullable List<String>>> field;\n" +
" ^^^^^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@Nullable ArrayList<@Nullable List<String>>\' is not a valid substitute for the type parameter \'T extends @Nullable List<@NonNull List<S>>\'\n" +
"----------\n");
}
public void testBug434600b_qualified() {
runNegativeTestWithLibs(
new String[] {
"p/I.java",
"package p;\n" +
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public interface I<S, T extends @Nullable List<@NonNull List<S>>> {\n" +
"}\n",
"C.java",
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public class C implements p.I<@Nullable String, ArrayList<@NonNull List<@Nullable String>>> {}\n" +
"class C1 {\n" +
" p.I<String, @Nullable ArrayList<@Nullable List<String>>> field;\n" +
"}\n" +
"class C2 implements p.I<@NonNull String, @Nullable ArrayList<@NonNull List<@Nullable String>>> {}\n" // FIXME: cross checking for contradictory substitution for 'S' NYI
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in C.java (at line 3)\n" +
" public class C implements p.I<@Nullable String, ArrayList<@NonNull List<@Nullable String>>> {}\n" +
" ^^^^^^^^^\n" +
"Null constraint mismatch: The type \'ArrayList<@NonNull List<@Nullable String>>\' is not a valid substitute for the type parameter \'T extends @Nullable List<@NonNull List<S>>\'\n" +
"----------\n" +
"2. ERROR in C.java (at line 5)\n" +
" p.I<String, @Nullable ArrayList<@Nullable List<String>>> field;\n" +
" ^^^^^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@Nullable ArrayList<@Nullable List<String>>\' is not a valid substitute for the type parameter \'T extends @Nullable List<@NonNull List<S>>\'\n" +
"----------\n");
}
public void testBug435399() {
runConformTestWithLibs(
new String[] {
"bug/Bug1.java",
"package bug;\n" +
"\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"public class Bug1 {\n" +
" public static <T> void method(@Nullable T value, T defaultValue) {\n" +
" }\n" +
" public void invoke() {\n" +
" method(Integer.valueOf(1), Boolean.TRUE);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug435962() {
runConformTestWithLibs(
new String[] {
"interfaces/CopyableNode.java",
"package interfaces;\n" +
"public interface CopyableNode<T extends ExtendedNode> extends ExtendedNode {\n" +
" public T deepCopy();\n" +
"}\n",
"interfaces/package-info.java",
"@org.eclipse.jdt.annotation.NonNullByDefault\n" +
"package interfaces;\n",
"interfaces/ExtendedNode.java",
"package interfaces;\n" +
"import java.util.ArrayList;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"public interface ExtendedNode {\n" +
" ExtendedNode getParent();\n" +
" void setParent(ExtendedNode newParent);\n" +
" int numChildren();\n" +
" void mutateNode(ExtendedNode root);\n" +
" void getAllNodes(ArrayList<ExtendedNode> array);\n" +
" ExtendedNode getNode(int nodeIndex);\n" +
" <N extends ExtendedNode> void getNodesOfType(Class<N> desiredType,\n" +
" ArrayList<N> array);\n" +
" <N extends ExtendedNode> @Nullable N getRandomNodeOfType(\n" +
" Class<N> desiredType, ExtendedNode root, ExtendedNode caller);\n" +
"}\n",
"interfaces/ValueNode.java",
"package interfaces;\n" +
"public interface ValueNode extends ExtendedNode {\n" +
"}\n",
"framework/package-info.java",
"@org.eclipse.jdt.annotation.NonNullByDefault\n" +
"package framework;\n",
"framework/BinaryOpNode.java",
"package framework;\n" +
"\n" +
"import interfaces.CopyableNode;\n" +
"import interfaces.ValueNode;\n" +
"public abstract class BinaryOpNode<T extends ValueNode & CopyableNode<T>, O>\n" +
" extends EqualBinaryNode<T> implements ValueNode {\n" +
" @SuppressWarnings(\"unused\") private O op;\n" +
" \n" +
" protected BinaryOpNode(final T left, @org.eclipse.jdt.annotation.NonNull final O op, final T right) {\n" +
" super(left, right);\n" +
" this.op = op;\n" +
" }\n" +
"}\n",
"framework/EqualBinaryNode.java",
"package framework;\n" +
"\n" +
"import interfaces.CopyableNode;\n" +
"import interfaces.ExtendedNode;\n" +
"public abstract class EqualBinaryNode<T extends ExtendedNode & CopyableNode<T>>\n" +
" implements ExtendedNode {\n" +
" protected T left;\n" +
" protected T right;\n" +
" \n" +
" protected EqualBinaryNode(final T left, final T right) {\n" +
" this.left = left;\n" +
" this.right = right;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug440462() {
runConformTestWithLibs(
new String[]{
"CompilerError.java",
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"import java.util.*;\n" +
"@NonNullByDefault\n" +
"public class CompilerError {\n" +
"\n" +
" List<@Nullable ? extends Integer> list = new ArrayList<@Nullable Integer>();\n" + // FIXME: should be able to use diamond!
"\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug440773() {
runConformTestWithLibs(
new String[] {
"CountingComparator.java",
"import java.util.Comparator;\n" +
"\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"\n" +
"@NonNullByDefault\n" +
"public class CountingComparator<T> implements Comparator<T> {\n" +
"\n" +
" private int m_accessCount = 0;\n" +
"\n" +
" private final Comparator<T> m_wrapped;\n" +
"\n" +
" public CountingComparator(final Comparator<T> wrapped) {\n" +
" m_wrapped = wrapped;\n" +
" }\n" +
"\n" +
" @Override\n" +
" @NonNullByDefault(DefaultLocation.RETURN_TYPE)\n" +
" public int compare(final T element1, final T element2) {\n" +
" m_accessCount++;\n" +
" return m_wrapped.compare(element1, element2);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug439298_comment2() {
runConformTestWithLibs(
new String[] {
"Extract.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"class R<T> {\n" +
" R(@Nullable T t) {}\n" +
"}\n" +
"class A {}\n" +
"@NonNullByDefault\n" +
"public class Extract {\n" +
" R<A> test() {\n" +
" return new R<A>(null);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug439298_comment3() {
runConformTestWithLibs(
new String[] {
"Extract.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"class R<T> {\n" +
" R(@Nullable T t) {}\n" +
"}\n" +
"class A {}\n" +
"public class Extract {\n" +
" R<A> test() {\n" +
" return new R<@NonNull A>(null);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug439298_comment4() {
runConformTestWithLibs(
new String[] {
"Extract.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"class R<T> {\n" +
" R(@Nullable T t) {}\n" +
"}\n" +
"class A {}\n" +
"public class Extract {\n" +
" R<@NonNull A> test() {\n" +
" return new R<>(null);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// this code raised: java.lang.IllegalArgumentException: Type doesn't have its own method?
// at org.eclipse.jdt.internal.compiler.lookup.SyntheticFactoryMethodBinding.applyTypeArgumentsOnConstructor(SyntheticFactoryMethodBinding.java:40)
public void testBug440764() {
runNegativeTestWithLibs(
new String[] {
"Extract.java",
"import java.util.Comparator;\n" +
"\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"@NonNullByDefault({ DefaultLocation.TYPE_PARAMETER })\n" +
"public class Extract<T> implements Comparator<@NonNull T> {\n" + // FIXME: annot on 'T' shouldn't be needed
" public Extract(Comparator<T> wrapped) {\n" +
" }\n" +
"\n" +
" @Override\n" +
" public int compare(T o1, T o2) {\n" +
" return 0;\n" +
" }\n" +
" \n" +
" void test(final Comparator<@Nullable Integer> c) {\n" +
" new Extract<>(c).compare(1, null);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Extract.java (at line 16)\n" +
" new Extract<>(c).compare(1, null);\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'Comparator<@NonNull Integer>\' but this expression has type \'Comparator<@Nullable Integer>\'\n" +
"----------\n" +
"2. ERROR in Extract.java (at line 16)\n" +
" new Extract<>(c).compare(1, null);\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Integer\' but the provided value is null\n" +
"----------\n");
}
public void testBug440759a() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault\n" +
"public class X<T> {\n" +
" T test(T t) {\n" +
" @NonNull T localT = t; // err#1\n" +
" return null; // err must mention free type variable, not @NonNull\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 5)\n" +
" @NonNull T localT = t; // err#1\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'T\' needs unchecked conversion to conform to \'@NonNull T\'\n" +
"----------\n" +
"2. ERROR in X.java (at line 6)\n" +
" return null; // err must mention free type variable, not @NonNull\n" +
" ^^^^\n" +
"Null type mismatch (type annotations): \'null\' is not compatible to the free type variable \'T\'\n" +
"----------\n");
}
// involves overriding, work done in ImplicitNullAnnotationVerifier.checkNullSpecInheritance()
public void testBug440759b() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface Y<T> {\n" +
" T test(T t);\n" +
"}\n" +
"@NonNullByDefault\n" +
"public class X<T> implements Y<T> {\n" +
" public T test(T t) {\n" +
" @NonNull T localT = t; // err#1\n" +
" return null; // err must mention free type variable, not @NonNull\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 8)\n" +
" @NonNull T localT = t; // err#1\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'T\' needs unchecked conversion to conform to \'@NonNull T\'\n" +
"----------\n" +
"2. ERROR in X.java (at line 9)\n" +
" return null; // err must mention free type variable, not @NonNull\n" +
" ^^^^\n" +
"Null type mismatch (type annotations): \'null\' is not compatible to the free type variable \'T\'\n" +
"----------\n");
}
public void testBug438383() {
runConformTestWithLibs(
new String[] {
"Foo.java",
"import java.util.*;\n" +
"import java.util.function.Supplier;\n" +
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"\n" +
"@NonNullByDefault public class Foo {\n" +
" static void foo(Supplier<List<?>> f) { }\n" +
" \n" +
" static void test() {\n" +
" foo(ArrayList::new);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug437270() {
runConformTestWithLibs(
new String[] {
"Foo.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class Foo {\n" +
" void test(String[] arguments) {\n" +
" if (arguments != null) {\n" +
" String @NonNull [] temp = arguments;\n" +
" }\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug437270_comment3() {
runConformTestWithLibs(
new String[] {
"Foo.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class Foo {\n" +
" void test() {\n" +
" @NonNull Object b = new Object();\n" +
" Object @NonNull[] c = { new Object() };\n" +
" \n" +
" test2( b );\n" +
" test3( c );\n" +
" }\n" +
" \n" +
" void test2(@Nullable Object z) { }\n" +
" \n" +
" void test3(Object @Nullable[] z) { }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug435841() {
runConformTestWithLibs(
new String[] {
"ArrayProblem.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault\n" +
"public class ArrayProblem {\n" +
" private String[] data = new String[0];\n" +
" \n" +
" void error1() {\n" +
" foo(data); // Compiler error: required 'String @Nullable[]', but this expression has type 'String @NonNull[]'\n" +
" }\n" +
" \n" +
" private String[] foo(String @Nullable[] input) {\n" +
" return new String[0];\n" +
" }\n" +
" \n" +
" String @Nullable[] error2() {\n" +
" String @NonNull[] nonnull = new String[0];\n" +
" return nonnull; // Compiler error: required 'String @Nullable[]' but this expression has type 'String @NonNull[]'\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug441693() {
runConformTestWithLibs(
new String[] {
"Foo.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"\n" +
"@NonNullByDefault({})\n" +
"public abstract class Foo {\n" +
" \n" +
" abstract <T> @NonNull T requireNonNull(@Nullable T obj);\n" +
" \n" +
" @NonNull Iterable<@NonNull String> iterable;\n" +
" \n" +
" Foo(@Nullable Iterable<@NonNull String> iterable) {\n" +
" this.iterable = requireNonNull(iterable); // (*)\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug441693other() {
runNegativeTestWithLibs(
new String[] {
"Foo.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"import org.eclipse.jdt.annotation.Nullable;\n" +
"import java.util.*;\n" +
"\n" +
"@NonNullByDefault({})\n" +
"public abstract class Foo {\n" +
" \n" +
" abstract <T> @NonNull T requireNonNull(@Nullable T obj);\n" +
" \n" +
" @NonNull String @NonNull[] array;\n" +
" \n" +
" Foo(@NonNull String @Nullable[] arr) {\n" +
" this.array = requireNonNull(arr); // (*)\n" +
" }\n" +
" @NonNull Foo testWild1(@Nullable List<? extends @NonNull Foo> foos) {\n" +
" return requireNonNull(foos).get(0);\n" +
" }\n" +
" @NonNull Foo testWild2(@Nullable List<@Nullable ? extends List<@NonNull Foo>> foos) {\n" +
" return requireNonNull(foos.get(0)).get(0);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Foo.java (at line 20)\n" +
" return requireNonNull(foos.get(0)).get(0);\n" +
" ^^^^\n" +
"Potential null pointer access: this expression has a \'@Nullable\' type\n" +
"----------\n");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=439158, [1.8][compiler][null] Adding null annotation to return type causes IllegalStateException and sometimes InvocationTargetException
public void testBug439158() {
runConformTestWithLibs(
new String[] {
"Test.java",
"import java.util.Collection;\n" +
"import java.util.List;\n" +
"import java.util.Set;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class Test {\n" +
" class X {\n" +
" \n" +
" }\n" +
" \n" +
" public static <C extends Collection<?>, A extends C, B extends C>\n" +
" @Nullable A transform(B arg) {\n" +
" return null;\n" +
" }\n" +
" \n" +
" public static void main(String[] args) {\n" +
" List<X> list = null;\n" +
" Set<X> result = transform(list);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=434579, [1.8][compiler][null] Annotation-based null analysis causes incorrect type errors
public void testBug434579() {
Map options = getCompilerOptions();
runConformTestWithLibs(
new String[] {
"AbstractNode.java",
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"@NonNullByDefault\n" +
"interface ExtendedNode {\n" +
" ExtendedNode getParent();\n" +
" void setParent(ExtendedNode newParent);\n" +
"}\n" +
"@NonNullByDefault\n" +
"public class AbstractNode implements ExtendedNode {\n" +
" private ExtendedNode parent;\n" +
" protected AbstractNode() {\n" +
" parent = this;\n" +
" }\n" +
" @Override\n" +
" public ExtendedNode getParent() {\n" +
" return parent;\n" +
" }\n" +
" @Override\n" +
" public void setParent(final ExtendedNode newParent) {\n" +
" parent = newParent;\n" +
" }\n" +
"}\n"
},
options,
"");
runConformTestWithLibs(
new String[] {
"UnequalBinaryNode.java",
"public class UnequalBinaryNode<L extends ExtendedNode, R extends ExtendedNode>\n" +
" extends AbstractNode {\n" +
" private L left;\n" +
" private R right;\n" +
" public UnequalBinaryNode(final L initialLeft, final R initialRight) {\n" +
" left = initialLeft;\n" +
" right = initialRight;\n" +
" left.setParent(this);\n" +
" right.setParent(this); // error on this line without fix\n" +
" }\n" +
"}\n"
},
options,
"");
}
//https://bugs.eclipse.org/bugs/show_bug.cgi?id=434582,
//[1.8][compiler][null] @Nullable annotation in type parameter causes NullPointerException in JDT core
public void testBug434582() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.Nullable;\n" +
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"@NonNullByDefault\n" +
"class ProgramNode {}\n" +
"@NonNullByDefault\n" +
"interface ConcreteNodeVisitor<R, P> {\n" +
" R visit(ProgramNode node, P extraParameter);\n" +
"}\n" +
"public class X implements\n" +
" ConcreteNodeVisitor<Boolean, @Nullable Object> {\n" +
" public Boolean visit(ProgramNode node, Object extraParameter) {\n" +
" return Boolean.FALSE;\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. WARNING in X.java (at line 11)\n" +
" public Boolean visit(ProgramNode node, Object extraParameter) {\n" +
" ^^^^^^^^^^^\n" +
"Missing non-null annotation: inherited method from ConcreteNodeVisitor<Boolean,Object> specifies this parameter as @NonNull\n" +
"----------\n" +
"2. ERROR in X.java (at line 11)\n" +
" public Boolean visit(ProgramNode node, Object extraParameter) {\n" +
" ^^^^^^\n" +
"Missing nullable annotation: inherited method from ConcreteNodeVisitor<Boolean,Object> specifies this parameter as @Nullable\n" +
"----------\n");
}
//https://bugs.eclipse.org/bugs/show_bug.cgi?id=434582,
//[1.8][compiler][null] @Nullable annotation in type parameter causes NullPointerException in JDT core
public void testBug434582a() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.Nullable;\n" +
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"@NonNullByDefault\n" +
"class ProgramNode {}\n" +
"@NonNullByDefault\n" +
"interface ConcreteNodeVisitor<R, P> {\n" +
" void visit(ProgramNode node, P extraParameter);\n" +
"}\n" +
"public class X implements\n" +
" ConcreteNodeVisitor<Boolean, @Nullable Object> {\n" +
" public void visit(ProgramNode node, Object extraParameter) {}\n" +
"}\n"
},
"----------\n" +
"1. WARNING in X.java (at line 11)\n" +
" public void visit(ProgramNode node, Object extraParameter) {}\n" +
" ^^^^^^^^^^^\n" +
"Missing non-null annotation: inherited method from ConcreteNodeVisitor<Boolean,Object> specifies this parameter as @NonNull\n" +
"----------\n" +
"2. ERROR in X.java (at line 11)\n" +
" public void visit(ProgramNode node, Object extraParameter) {}\n" +
" ^^^^^^\n" +
"Missing nullable annotation: inherited method from ConcreteNodeVisitor<Boolean,Object> specifies this parameter as @Nullable\n" +
"----------\n");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=443467, [1.8][null]InternalError: Unexpected binding type
public void test443467() throws Exception {
String jreDirectory = Util.getJREDirectory();
String jfxJar = Util.toNativePath(jreDirectory + "/lib/ext/jfxrt.jar");
this.runNegativeTestWithExtraLibs(
new String[] {
"BuildIdeMain.java",
"import java.nio.file.Path;\n" +
"import java.time.Instant;\n" +
"import java.util.HashMap;\n" +
"import java.util.stream.Stream;\n" +
"import javafx.util.Pair;\n" +
"\n" +
"public class BuildIdeMain {\n" +
"static void writeUpdates(Stream<Path> filter2, HashMap<Path, Pair<byte[], Instant>> ideFiles, HashMap<Path, Path> updateToFile) {\n" +
" filter2.map(p -> new Pair<>(updateToFile.get(p), p->ideFiles.get(p)));\n" +
"}\n" +
"}\n",
},
"----------\n" +
"1. ERROR in BuildIdeMain.java (at line 9)\n" +
" filter2.map(p -> new Pair<>(updateToFile.get(p), p->ideFiles.get(p)));\n" +
" ^^^^^^^^^^^^^^^^^^\n" +
"The target type of this expression must be a functional interface\n" +
"----------\n",
new String[]{jfxJar});
}
public void testBug445227() {
runConformTestWithLibs(
new String[] {
"Bar.java",
"@org.eclipse.jdt.annotation.NonNullByDefault\n" +
"class Bar<E extends Bar.Foo<E>> {\n" +
" final Iterable<E> list;\n" +
"\n" +
" Bar() {\n" +
" this((Iterable<E>) emptyList());\n" +
" }\n" +
"\n" +
" Bar(Iterable<E> list) { this.list = list; }\n" +
"\n" +
" private static <X extends Foo<X>> Iterable<X> emptyList() { throw new UnsupportedOperationException(); }\n" +
"\n" +
" interface Foo<F extends Foo<F>> { }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in Bar.java (at line 6)\n" +
" this((Iterable<E>) emptyList());\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Type safety: Unchecked cast from Iterable<Bar.Foo<Bar.Foo<X>>> to Iterable<E>\n" +
"----------\n");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=446715, [compiler] org.eclipse.jdt.internal.compiler.lookup.TypeSystem.cacheDerivedType
public void test446715() {
Map options = getCompilerOptions();
runConformTestWithLibs(
new String[] {
"Y.java",
"import org.eclipse.jdt.annotation.NonNull;\n" +
"public class Y {\n" +
" public Z.ZI @NonNull [] zz = new Z.ZI[0];\n" +
"}\n",
"Z.java",
"public class Z {\n" +
" public class ZI {\n" +
" }\n" +
"}\n"
},
options,
"");
runNegativeTestWithLibs(
new String[] {
"X.java",
"public class X {\n" +
" public static void main(String[] args) {\n" +
" Y y = new Y();\n" +
" y.zz = null;\n" +
" }\n" +
"}\n"
},
options,
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" y.zz = null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'Z.ZI @NonNull[]\' but the provided value is null\n" +
"----------\n");
}
// https://bugs.eclipse.org/bugs/show_bug.cgi?id=445669, java.lang.IllegalStateException at org.eclipse.jdt.internal.compiler.lookup.UnresolvedReferenceBinding.clone
public void test445669() {
Map options = getCompilerOptions();
runConformTestWithLibs(
new String[] {
"Y.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault(DefaultLocation.FIELD)\n" +
"public class Y {\n" +
" public Z.ZI zzi = new Z().new ZI();\n" +
" public Z z = new Z();\n" +
"}\n",
"Z.java",
"public class Z {\n" +
" public class ZI {\n" +
" }\n" +
"}\n"
},
options,
"");
runNegativeTestWithLibs(
new String[] {
"X.java",
"public class X {\n" +
" public static void main(String[] args) {\n" +
" Y y = new Y();\n" +
" y.zzi = null;\n" +
" y.z = null;\n" +
" }\n" +
"}\n"
},
options,
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" y.zzi = null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'Z.@NonNull ZI\' but the provided value is null\n" +
"----------\n" +
"2. ERROR in X.java (at line 5)\n" +
" y.z = null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Z\' but the provided value is null\n" +
"----------\n");
}
public void testArrayOfArrays() {
this.runNegativeTestWithLibs(
new String[] {
"X.java",
"import java.util.ArrayList;\n" +
"import java.util.Arrays;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" public static void main(String[] args) {\n" +
" String [] @Nullable [] @NonNull [] arr = new String[][][] {};\n" +
" ArrayList<String[][]> al = new ArrayList<String [][]>(Arrays.asList(arr));\n" +
" }\n" +
"}\n",
},
"----------\n" +
"1. WARNING in X.java (at line 6)\n" +
" String [] @Nullable [] @NonNull [] arr = new String[][][] {};\n" +
" ^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'String[][][]\' needs unchecked conversion to conform to \'String [] @Nullable[] @NonNull[]\'\n" +
"----------\n");
}
public void testBug447088() {
runConformTestWithLibs(
new String[] {
"FullyQualifiedNullable.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault\n" +
"public class FullyQualifiedNullable {\n" +
" java.lang.@Nullable String text;\n" +
" java.lang.@Nullable String getText() {\n" +
" return text;\n" +
" }\n" +
"}\n"
},
null,
"");
}
public void testBug448777() {
runNegativeTestWithLibs(
new String[] {
"DoubleInference.java",
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class DoubleInference {\n" +
"\n" +
" @FunctionalInterface\n" +
" interface Func<@Nullable T> {\n" +
" T a(T i);\n" +
" }\n" +
"\n" +
" <X> X applyWith(Func<X> f, X x) { return x; }\n" +
"\n" +
" @NonNull String test1() {\n" +
" return applyWith(i -> i, \"hallo\");\n" +
" }\n" +
" void test2(Func<String> f1, Func<@NonNull String> f2) {\n" +
" f1.a(null);\n" +
" f2.a(null);\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in DoubleInference.java (at line 10)\n" +
" <X> X applyWith(Func<X> f, X x) { return x; }\n" +
" ^\n" +
"Null constraint mismatch: The type \'X\' is not a valid substitute for the type parameter \'@Nullable T\'\n" +
"----------\n" +
"2. ERROR in DoubleInference.java (at line 13)\n" +
" return applyWith(i -> i, \"hallo\");\n" +
" ^^^^^^\n" +
"The target type of this expression must be a functional interface\n" +
"----------\n" +
"3. ERROR in DoubleInference.java (at line 15)\n" +
" void test2(Func<String> f1, Func<@NonNull String> f2) {\n" +
" ^^^^^^\n" +
"Null constraint mismatch: The type \'String\' is not a valid substitute for the type parameter \'@Nullable T\'\n" +
"----------\n" +
"4. ERROR in DoubleInference.java (at line 15)\n" +
" void test2(Func<String> f1, Func<@NonNull String> f2) {\n" +
" ^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@NonNull String\' is not a valid substitute for the type parameter \'@Nullable T\'\n" +
"----------\n" +
"5. ERROR in DoubleInference.java (at line 17)\n" +
" f2.a(null);\n" +
" ^^^^^^^^^^\n" +
"Contradictory null annotations: method was inferred as \'@Nullable @NonNull String a(@Nullable @NonNull String)\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n");
}
public void testBug446442_comment2a() {
runNegativeTestWithLibs(
new String[] {
"Test.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface Foo<T, N extends Number> {\n" +
" void m(@NonNull N arg2);\n" +
"\n" +
" void m(@Nullable T arg1);\n" +
"}\n" +
"\n" +
"interface Baz extends Foo<Integer, Integer> {}\n" +
"\n" +
"class Impl implements Baz {\n" +
" public void m(@NonNull Integer i) {}\n" +
"}\n" +
"\n" +
"public class Test {\n" +
" Baz baz= x -> {\n" +
" x= null;\n" +
" }; \n" +
"}\n"
},
"----------\n" +
"1. ERROR in Test.java (at line 11)\n" +
" public void m(@NonNull Integer i) {}\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Illegal redefinition of parameter i, inherited method from Foo<Integer,Integer> declares this parameter as @Nullable\n" +
"----------\n");
}
// swapped order of method declarations
public void testBug446442_comment2b() {
runNegativeTestWithLibs(
new String[] {
"Test.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface Foo<T, N extends Number> {\n" +
" void m(@Nullable T arg1);\n" +
"\n" +
" void m(@NonNull N arg2);\n" +
"}\n" +
"\n" +
"interface Baz extends Foo<Integer, Integer> {}\n" +
"\n" +
"class Impl implements Baz {\n" +
" public void m(@NonNull Integer i) {}\n" +
"}\n" +
"\n" +
"public class Test {\n" +
" Baz baz= x -> {\n" +
" x= null;\n" +
" }; \n" +
"}\n"
},
"----------\n" +
"1. ERROR in Test.java (at line 11)\n" +
" public void m(@NonNull Integer i) {}\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Illegal redefinition of parameter i, inherited method from Foo<Integer,Integer> declares this parameter as @Nullable\n" +
"----------\n");
}
// inherit from two different supers
public void testBug446442_comment2c() {
runNegativeTestWithLibs(
new String[] {
"Test.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface Foo0<T, N extends Number> {\n" +
" void m(@Nullable T arg1);\n" +
"}\n" +
"\n" +
"interface Foo1<T, N extends Number> {\n" +
" void m(@NonNull N arg2);\n" +
"}\n" +
"\n" +
"interface Baz extends Foo1<Integer, Integer>, Foo0<Integer, Integer> {}\n" +
"\n" +
"class Impl implements Baz {\n" +
" public void m(@NonNull Integer i) {}\n" +
"}\n" +
"\n" +
"public class Test {\n" +
" Baz baz= x -> {\n" +
" x= null;\n" +
" }; \n" +
"}\n"
},
"----------\n" +
"1. ERROR in Test.java (at line 13)\n" +
" public void m(@NonNull Integer i) {}\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Illegal redefinition of parameter i, inherited method from Foo0<Integer,Integer> declares this parameter as @Nullable\n" +
"----------\n");
}
// merging @NonNull & unannotated in arg-position must answer unannotated
public void testBug446442_2a() {
runNegativeTestWithLibs(
new String[] {
"Test.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface Foo<T, N extends Number> {\n" +
" void m(@NonNull N arg2);\n" +
"\n" +
" void m(T arg1);\n" +
"}\n" +
"\n" +
"interface Baz extends Foo<Integer, Integer> {}\n" +
"\n" +
"public class Test {\n" +
" Baz baz= x -> {\n" +
" @NonNull Object o = x;\n" +
" }; \n" +
"}\n"
},
"----------\n" +
"1. WARNING in Test.java (at line 12)\n" +
" @NonNull Object o = x;\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'Integer\' needs unchecked conversion to conform to \'@NonNull Object\'\n" +
"----------\n");
}
// merging @NonNull & unannotated in arg-position must answer unannotated - swapped order
public void testBug446442_2b() {
runNegativeTestWithLibs(
new String[] {
"Test.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface Foo<T, N extends Number> {\n" +
" void m(T arg1);\n" +
"\n" +
" void m(@NonNull N arg2);\n" +
"}\n" +
"\n" +
"interface Baz extends Foo<Integer, Integer> {}\n" +
"\n" +
"public class Test {\n" +
" Baz baz= x -> {\n" +
" @NonNull Object o = x;\n" +
" }; \n" +
"}\n"
},
"----------\n" +
"1. WARNING in Test.java (at line 12)\n" +
" @NonNull Object o = x;\n" +
" ^\n" +
"Null type safety (type annotations): The expression of type \'Integer\' needs unchecked conversion to conform to \'@NonNull Object\'\n" +
"----------\n");
}
// using inherited implementation to fulfill both contracts
public void testBug446442_3() {
runConformTestWithLibs(
new String[] {
"Test.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface Foo<T, N extends Number> {\n" +
" void m(@NonNull N arg2);\n" +
"\n" +
" void m(T arg1);\n" +
"}\n" +
"\n" +
"interface Baz extends Foo<Integer, Integer> {}\n" +
"class Impl {\n" +
" public void m(Integer a) {}\n" +
"}\n" +
"class BazImpl extends Impl implements Baz {}\n" +
"\n" +
"public class Test {\n" +
" void test(BazImpl b) {\n" +
" b.m(null);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// unsuccessful attempt to trigger use of MostSpecificExceptionMethodBinding
public void testBug446442_4() {
runConformTestWithLibs(
new String[] {
"Test.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface Foo<T, N extends Number> {\n" +
" abstract void m(@NonNull N arg2) throws Exception;\n" +
"\n" +
" default void m(T arg1) throws java.io.IOException {}\n" +
"}\n" +
"\n" +
"interface Baz extends Foo<Integer, Integer> {}\n" +
"abstract class Impl {\n" +
" public void m(Integer a) throws java.io.IOException {}\n" +
"}\n" +
"class BazImpl extends Impl implements Baz {}\n" +
"\n" +
"public class Test {\n" +
" void test(BazImpl b) throws java.io.IOException {\n" +
" b.m(null);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// annotated return types
public void testBug446442_5() {
runNegativeTestWithLibs(
new String[] {
"Test.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface Foo<T, N extends Number> {\n" +
" T m(T t);\n" +
"\n" +
" @NonNull N m(N n);\n" +
"}\n" +
"\n" +
"interface Baz extends Foo<Integer, Integer> {}\n" +
"\n" +
"class Impl implements Baz {\n" +
" public Integer m(Integer i) { return new Integer(0); }\n" +
"}\n" +
"\n" +
"public class Test {\n" +
" Baz baz= x -> null;\n" +
"}\n"
},
"----------\n" +
"1. ERROR in Test.java (at line 11)\n" +
" public Integer m(Integer i) { return new Integer(0); }\n" +
" ^^^^^^^\n" +
"The return type is incompatible with \'@NonNull Integer\' returned from Foo<Integer,Integer>.m(Integer) (mismatching null constraints)\n" +
"----------\n" +
"2. ERROR in Test.java (at line 15)\n" +
" Baz baz= x -> null;\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull Integer\' but the provided value is null\n" +
"----------\n");
}
// conflicting annotations on type arguments
public void testBug446442_6a() {
runNegativeTestWithLibs(
new String[] {
"Test.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"interface Foo<T,C1 extends Collection<T>, C2 extends List<T>> {\n" +
" void m(C1 a1);\n" +
"\n" +
" void m(C2 a2);\n" +
"}\n" +
"\n" +
"interface Baz extends Foo<Integer, ArrayList<@NonNull Integer>, ArrayList<@Nullable Integer>> {}\n" +
"\n" +
"class Impl implements Baz {\n" +
" public void m(ArrayList<@NonNull Integer> i) {} // contradictory type cannot be implemented\n" +
"}\n" +
"\n" +
"public class Test {\n" +
" Baz baz= x -> { // contradictory type cannot be used as SAM\n" +
" x.add(null); // contradictory type cause errors at call sites\n" +
" }; \n" +
"}\n"
},
"----------\n" +
"1. ERROR in Test.java (at line 12)\n" +
" public void m(ArrayList<@NonNull Integer> i) {} // contradictory type cannot be implemented\n" +
" ^^^^^^^^^\n" +
"Illegal redefinition of parameter i, inherited method from Foo<Integer,ArrayList<Integer>,ArrayList<Integer>> declares this parameter as \'ArrayList<@Nullable Integer>\' (mismatching null constraints)\n" +
"----------\n" +
"2. ERROR in Test.java (at line 16)\n" +
" Baz baz= x -> { // contradictory type cannot be used as SAM\n" +
" x.add(null); // contradictory type cause errors at call sites\n" +
" }; \n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Contradictory null annotations: function type was inferred as \'void (ArrayList<@NonNull @Nullable Integer>)\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n" +
"3. ERROR in Test.java (at line 17)\n" +
" x.add(null); // contradictory type cause errors at call sites\n" +
" ^^^^^^^^^^^\n" +
"Contradictory null annotations: method was inferred as \'boolean add(@NonNull @Nullable Integer)\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n");
}
// swapped order of method declarations + added return type
public void testBug446442_6b() {
runNegativeTestWithLibs(
new String[] {
"Test.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.*;\n" +
"interface Foo<T,C1 extends Collection<T>, C2 extends List<T>> {\n" +
" C2 m(C2 a2);\n" +
"\n" +
" C1 m(C1 a1);\n" +
"}\n" +
"\n" +
"interface Baz extends Foo<Integer, ArrayList<@NonNull Integer>, ArrayList<@Nullable Integer>> {}\n" +
"\n" +
"class Impl implements Baz {\n" +
" public ArrayList<@NonNull Integer> m(ArrayList<@Nullable Integer> i) { return i; }\n" +
"}\n" +
"\n" +
"public class Test {\n" +
" Baz baz= x -> {\n" +
" x.add(null);\n" +
" x.get(0);\n" +
" return x;\n" +
" };\n" +
"}\n"
},
"----------\n" +
"1. ERROR in Test.java (at line 12)\n" +
" public ArrayList<@NonNull Integer> m(ArrayList<@Nullable Integer> i) { return i; }\n" +
" ^^^^^^^^^\n" +
"The return type is incompatible with \'ArrayList<@Nullable Integer>\' returned from Foo<Integer,ArrayList<Integer>,ArrayList<Integer>>.m(ArrayList<Integer>) (mismatching null constraints)\n" +
"----------\n" +
"2. ERROR in Test.java (at line 12)\n" +
" public ArrayList<@NonNull Integer> m(ArrayList<@Nullable Integer> i) { return i; }\n" +
" ^^^^^^^^^\n" +
"Illegal redefinition of parameter i, inherited method from Foo<Integer,ArrayList<Integer>,ArrayList<Integer>> declares this parameter as \'ArrayList<@NonNull Integer>\' (mismatching null constraints)\n" +
"----------\n" +
"3. ERROR in Test.java (at line 16)\n" +
" Baz baz= x -> {\n" +
" x.add(null);\n" +
" x.get(0);\n" +
" return x;\n" +
" };\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Contradictory null annotations: function type was inferred as \'ArrayList<@NonNull @Nullable Integer> (ArrayList<@Nullable @NonNull Integer>)\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n" +
"4. ERROR in Test.java (at line 17)\n" +
" x.add(null);\n" +
" ^^^^^^^^^^^\n" +
"Contradictory null annotations: method was inferred as \'boolean add(@Nullable @NonNull Integer)\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n" +
"5. ERROR in Test.java (at line 18)\n" +
" x.get(0);\n" +
" ^^^^^^^^\n" +
"Contradictory null annotations: method was inferred as \'@Nullable @NonNull Integer get(int)\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n");
}
public void testBug453475() {
runConformTestWithLibs(
new String[] {
"TestMap.java",
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"@NonNullByDefault\n" +
"public abstract class TestMap extends AbstractMap<String,@Nullable String> {\n" +
"\n" +
"}\n"
}, null, "");
runConformTestWithLibs(
new String[] {
"Test.java",
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"@NonNullByDefault\n" +
"public class Test {\n" +
"\n" +
" public static final void test(TestMap testMap) {\n" +
" testMap.putAll(new HashMap<String,@Nullable String>()); // Error: Contradictory null annotations: method was inferred as 'void putAll(Map<? extends @NonNull String,? extends @NonNull @Nullable String>)', but only one of '@NonNull' and '@Nullable' can be effective at any location\n" +
" }\n" +
"\n" +
"}\n"
}, null, "");
}
// also: don't apply default to use of type variable
public void testBug453475a() {
runConformTestWithLibs(
new String[] {
"NamespaceStorage.java",
"import java.util.*;\n" +
"@org.eclipse.jdt.annotation.NonNullByDefault\n" +
"public interface NamespaceStorage<T> \n" +
"{\n" +
"\n" +
" Set<T> getObjects(); \n" + // here <T> was wrongly read from .class as <@NonNull T>
" T getObject(T in);\n" +
"}\n"
}, null, "");
runConformTestWithLibs(
new String[] {
"NamespaceStorageImpl.java",
"import java.util.*;\n" +
"@org.eclipse.jdt.annotation.NonNullByDefault\n" +
"public class NamespaceStorageImpl<T> implements NamespaceStorage<T>\n" +
"{\n" +
" @Override\n" +
" public Set<T> getObjects() \n" +
" {\n" +
" return new TreeSet<T>();\n" +
" }\n" +
" @Override\n" +
" public T getObject(T in)\n" +
" {\n" +
" return in;\n" +
" }\n" +
"}\n"
},
null, "");
}
// also: don't apply default to wildcard
public void testBug453475b() {
runConformTestWithLibs(
new String[] {
"X.java",
"import java.util.*;\n" +
"@org.eclipse.jdt.annotation.NonNullByDefault\n" +
"public interface X {\n" +
"\n" +
" void test(List<?> list);\n" + // here <?> was wrongly read from .class as <@NonNull ?>
" \n" +
"}\n"
}, null, "");
runConformTestWithLibs(
new String[] {
"Y.java",
"import java.util.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public class Y {\n" +
" public void run(X x, @NonNull List<@Nullable String> s) \n" +
" {\n" +
" x.test(s);\n" +
" }\n" +
"}\n"
},
null, "");
}
public void testBug456236() {
runConformTestWithLibs(
new String[] {
"Nullsafe.java",
"import org.eclipse.jdt.annotation.*;\n" +
"class Nullsafe<T> {\n" +
" final @Nullable T t;\n" +
"\n" +
" Nullsafe(@Nullable T t) {\n" +
" this.t = t;\n" +
" }\n" +
" public static <U> Nullsafe<U> of(@Nullable U u) {\n" +
" return new Nullsafe<>(u); // compile error\n" +
" }\n" +
"}\n"
},
null,
"");
}
public void testBug456497() throws Exception {
runConformTestWithLibs(
new String[] {
"libs/Lib1.java",
"package libs;\n" +
"\n" +
"import java.util.Collection;\n" +
"import java.util.Iterator;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public interface Lib1 {\n" +
" <T> Iterator<T> unconstrainedTypeArguments1(Collection<@Nullable T> in);\n" +
" Iterator<@NonNull String> unconstrainedTypeArguments2(Collection<String> in);\n" +
"}\n",
"tests/Test1.java",
"package tests;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"import java.util.Collection;\n" +
"import java.util.Iterator;\n" +
"\n" +
"import libs.Lib1;\n" +
"\n" +
"public class Test1 {\n" +
" Iterator<@NonNull String> test1(Lib1 lib, Collection<@Nullable String> coll) {\n" +
" return lib.unconstrainedTypeArguments1(coll);\n" +
" }\n" +
" Iterator<@NonNull String> test2(Lib1 lib, Collection<@Nullable String> coll) {\n" +
" return lib.unconstrainedTypeArguments2(coll);\n" +
" }\n" +
"}\n"
},
null,
"");
}
// original case
public void testBug456487a() {
runConformTestWithLibs(
new String[]{
"Optional.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class Optional<@NonNull T> {\n" +
" @Nullable T value;\n" +
" private Optional(T value) { this.value = value; }\n" +
" public static <@NonNull T> Optional<T> of(T value) { return new Optional<T>(value); }\n" +
" public T get() { \n" +
" @Nullable T t = this.value;\n" +
" if (t != null) return t; \n" +
" throw new RuntimeException(\"No value present\");\n" +
" }\n" +
" public @Nullable T orElse(@Nullable T other) { return (this.value != null) ? this.value : other; }\n" +
"}\n"
},
null,
"");
}
// witness for NPE in NullAnnotationMatching.providedNullTagBits:
public void testBug456487b() {
runNegativeTestWithLibs(
new String[]{
"Optional.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class Optional<@Nullable T> {\n" +
" @Nullable T value;\n" +
" private Optional(T value) { this.value = value; }\n" +
" public static <@NonNull T> Optional<T> of(T value) { return new Optional<T>(value); }\n" +
" public T get() { \n" +
" @Nullable T t = this.value;\n" +
" if (t != null) return t; \n" +
" throw new RuntimeException(\"No value present\");\n" +
" }\n" +
" public @Nullable T orElse(@Nullable T other) { return (this.value != null) ? this.value : other; }\n" +
"}\n",
"OTest.java",
"import org.eclipse.jdt.annotation.*;\n" +
"@NonNullByDefault\n" +
"class OTest {\n" +
" public static void good() {\n" +
" Optional<String> os1 = Optional.of(\"yes\");\n" +
" @NonNull String s = os1.get();\n" +
" @Nullable String ns = os1.orElse(null);\n" +
" }\n" +
" public static void bad() {\n" +
" Optional<String> os = Optional.of(null);\n" +
" @NonNull String s = os.orElse(null);\n" +
" }\n" +
"}\n"
},
"----------\n" +
"1. ERROR in Optional.java (at line 5)\n" +
" public static <@NonNull T> Optional<T> of(T value) { return new Optional<T>(value); }\n" +
" ^\n" +
"Null constraint mismatch: The type \'@NonNull T\' is not a valid substitute for the type parameter \'@Nullable T\'\n" +
"----------\n" +
"2. ERROR in Optional.java (at line 5)\n" +
" public static <@NonNull T> Optional<T> of(T value) { return new Optional<T>(value); }\n" +
" ^^^^^^^^^^^^^^^^^^^^^^\n" +
"Contradictory null annotations: method was inferred as \'void <init>(@Nullable @NonNull T)\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n" +
"3. ERROR in Optional.java (at line 5)\n" +
" public static <@NonNull T> Optional<T> of(T value) { return new Optional<T>(value); }\n" +
" ^\n" +
"Null constraint mismatch: The type \'@NonNull T\' is not a valid substitute for the type parameter \'@Nullable T\'\n" +
"----------\n" +
"----------\n" +
"1. ERROR in OTest.java (at line 5)\n" +
" Optional<String> os1 = Optional.of(\"yes\");\n" +
" ^^^^^^\n" +
"Null constraint mismatch: The type \'@NonNull String\' is not a valid substitute for the type parameter \'@Nullable T\'\n" +
"----------\n" +
"2. ERROR in OTest.java (at line 6)\n" +
" @NonNull String s = os1.get();\n" +
" ^^^^^^^^^\n" +
"Contradictory null annotations: method was inferred as \'@Nullable @NonNull String get()\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n" +
"3. ERROR in OTest.java (at line 7)\n" +
" @Nullable String ns = os1.orElse(null);\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Contradictory null annotations: method was inferred as \'@Nullable @NonNull String orElse(@Nullable @NonNull String)\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n" +
"4. ERROR in OTest.java (at line 10)\n" +
" Optional<String> os = Optional.of(null);\n" +
" ^^^^^^\n" +
"Null constraint mismatch: The type \'@NonNull String\' is not a valid substitute for the type parameter \'@Nullable T\'\n" +
"----------\n" +
"5. ERROR in OTest.java (at line 10)\n" +
" Optional<String> os = Optional.of(null);\n" +
" ^^^^\n" +
"Null type mismatch: required \'@NonNull String\' but the provided value is null\n" +
"----------\n" +
"6. ERROR in OTest.java (at line 11)\n" +
" @NonNull String s = os.orElse(null);\n" +
" ^^^^^^^^^^^^^^^\n" +
"Contradictory null annotations: method was inferred as \'@Nullable @NonNull String orElse(@Nullable @NonNull String)\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n");
}
public void testBug454182() {
Map options = getCompilerOptions();
options.put(JavaCore.COMPILER_NONNULL_BY_DEFAULT_ANNOTATION_NAME, "annot.NonNullByDefault");
String[] libs = this.LIBS.clone();
libs[libs.length-1] = this.getCompilerTestsPluginDirectoryPath() + File.separator + "workspace" + File.separator + "Test454182.jar";
runConformTest(
new String[] {
"p/package-info.java",
"@annot.NonNullByDefault package p;\n"
},
"",
libs,
false,
null,
options,
null);
}
public void testBug443870() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface Listener<T> {}\n" +
"interface I0<T,U extends Listener<T>> {}\n" +
"interface I1<T> extends I0<T,Listener<T>> {}\n" +
"class Y<S> {\n" +
" private @NonNull I0<S,Listener<S>> f;\n" +
" Y (@NonNull I0<S,Listener<S>> in) { this.f = in; }\n" +
" @NonNull I0<S,Listener<S>> getI() { return f; }\n" +
"}\n" +
"public class X<V> extends Y<V> {\n" +
" private @NonNull I1<V> f;\n" +
" X (@NonNull I1<V> in) { super(in); this.f = in; }\n" +
" @Override\n" +
" @NonNull I1<V> getI() { return f; }\n" +
"}\n"
},
null,
"");
}
public void testBug437072() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"import java.util.List;\n" +
"public class X {\n" +
" @NonNull int[][] ints = new int[3][4];\n" +
" @NonNull int[][] test1() { return new int[3][4]; }\n" +
" void test2(@NonNull boolean[][] bools) {\n" +
" @NonNull boolean[][] bools2 = bools;\n" +
" }\n" +
" List<@NonNull int[]> intslist;\n" +
" List<@NonNull int> intlist;\n" +
"}\n"
},
"----------\n" +
"1. ERROR in X.java (at line 4)\n" +
" @NonNull int[][] ints = new int[3][4];\n" +
" ^^^^^^^^\n" +
"The nullness annotation @NonNull is not applicable for the primitive type int\n" +
"----------\n" +
"2. ERROR in X.java (at line 5)\n" +
" @NonNull int[][] test1() { return new int[3][4]; }\n" +
" ^^^^^^^^\n" +
"The nullness annotation @NonNull is not applicable for the primitive type int\n" +
"----------\n" +
"3. ERROR in X.java (at line 6)\n" +
" void test2(@NonNull boolean[][] bools) {\n" +
" ^^^^^^^^\n" +
"The nullness annotation @NonNull is not applicable for the primitive type boolean\n" +
"----------\n" +
"4. ERROR in X.java (at line 7)\n" +
" @NonNull boolean[][] bools2 = bools;\n" +
" ^^^^^^^^\n" +
"The nullness annotation @NonNull is not applicable for the primitive type boolean\n" +
"----------\n" +
"5. ERROR in X.java (at line 9)\n" +
" List<@NonNull int[]> intslist;\n" +
" ^^^^^^^^\n" +
"The nullness annotation @Nullable is not applicable for the primitive type int\n" +
"----------\n" +
"6. ERROR in X.java (at line 10)\n" +
" List<@NonNull int> intlist;\n" +
" ^^^\n" +
"Syntax error, insert \"Dimensions\" to complete ReferenceType\n" +
"----------\n");
}
public void testBug448709() {
Map compilerOptions = getCompilerOptions();
compilerOptions.put(JavaCore.COMPILER_PB_NULL_SPECIFICATION_VIOLATION, JavaCore.WARNING); // ensure program is runnable
runConformTestWithLibs(
new String[] {
"Test.java",
"import java.util.*;\n" +
"import java.util.function.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"public class Test {\n" +
"\n" +
" /**\n" +
" * A null-annotated version of {@link Objects#requireNonNull(Object)}.\n" +
" */\n" +
" public static final <T> @NonNull T requireNonNull(final @Nullable T obj) {\n" +
" if (obj == null) throw new NullPointerException();\n" +
" return obj;\n" +
" }\n" +
"\n" +
" /**\n" +
" * A null-annotated version of {@link Optional#map(Function)}.\n" +
" */\n" +
" public static final <T,U> @NonNull Optional<U> map(final @NonNull Optional<T> optional, final Function<@NonNull ? super T,? extends U> mapper) {\n" +
" if (!optional.isPresent()) return requireNonNull(Optional.empty());\n" +
" final T source = optional.get();\n" +
" final U result = mapper.apply(source);\n" +
" System.out.println(source+\"->\"+result);\n" +
" return requireNonNull(Optional.<U> ofNullable(result));\n" +
" }\n" +
"\n" +
" /**\n" +
" * A method with a {@link NonNull} {@link DefaultLocation#PARAMETER} and {@link DefaultLocation#RETURN_TYPE}.\n" +
" */\n" +
" public static final @NonNull Integer testMethod(final @NonNull String s) {\n" +
" final Integer r = Integer.valueOf(s);\n" +
" if (r == null) throw new NullPointerException();\n" +
" return r+1;\n" +
" }\n" +
"\n" +
" public static void main(final String[] args) {\n" +
" final @NonNull Optional<@Nullable String> optNullableString = requireNonNull(Optional.ofNullable(\"1\"));\n" +
"\n" +
" final Function<@NonNull String,@NonNull Integer> testMethodRef = Test::testMethod;\n" +
" map(optNullableString, testMethodRef);\n" +
"\n" +
" map(optNullableString, Test::testMethod); // Error: Null type mismatch at parameter 1: required '@NonNull String' but provided '@Nullable String' via method descriptor Function<String,Integer>.apply(String)\n" +
"\n" +
" map(optNullableString, (s) -> Test.testMethod(s));\n" +
" }\n" +
"\n" +
"}\n"
},
compilerOptions,
"----------\n" +
"1. WARNING in Test.java (at line 39)\n" +
" map(optNullableString, testMethodRef);\n" +
" ^^^^^^^^^^^^^\n" +
"Contradictory null annotations: method was inferred as \'@NonNull Optional<@NonNull Integer> map(@NonNull Optional<@Nullable String>, Function<@NonNull ? super @Nullable String,? extends @NonNull Integer>)\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n" +
"2. WARNING in Test.java (at line 41)\n" +
" map(optNullableString, Test::testMethod); // Error: Null type mismatch at parameter 1: required \'@NonNull String\' but provided \'@Nullable String\' via method descriptor Function<String,Integer>.apply(String)\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Contradictory null annotations: method was inferred as \'@NonNull Optional<@NonNull Integer> map(@NonNull Optional<@Nullable String>, Function<@NonNull ? super @Nullable String,? extends @NonNull Integer>)\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n" +
"3. WARNING in Test.java (at line 43)\n" +
" map(optNullableString, (s) -> Test.testMethod(s));\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Contradictory null annotations: method was inferred as \'@NonNull Optional<@NonNull Integer> map(@NonNull Optional<@Nullable String>, Function<@NonNull ? super @Nullable String,? extends @NonNull Integer>)\', but only one of \'@NonNull\' and \'@Nullable\' can be effective at any location\n" +
"----------\n" +
"4. WARNING in Test.java (at line 43)\n" +
" map(optNullableString, (s) -> Test.testMethod(s));\n" +
" ^\n" +
"Null type mismatch (type annotations): required \'@NonNull String\' but this expression has type \'@Nullable String\'\n" +
"----------\n",
"1->2\n" +
"1->2\n" +
"1->2");
}
public void testBug459967_Array_constructor() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface FI<T> {\n" +
" T @NonNull[] getArray(int size);" +
"}\n" +
"public class X {\n" +
" void consumer(FI<String> fis) {}\n" +
" void test() {\n" +
" consumer(String[]::new);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug459967_Array_constructor_b() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface FI<T> {\n" +
" @NonNull T @NonNull[] getArray(int size);" +
"}\n" +
"public class X {\n" +
" void consumer(FI<String> fis) {}\n" +
" void test() {\n" +
" consumer(String[]::new);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 7)\n" +
" consumer(String[]::new);\n" +
" ^^^^^^^^^^^^^\n" +
"Null type safety at method return type: Method descriptor FI<String>.getArray(int) promises \'@NonNull String @NonNull[]\' but referenced method provides \'String @NonNull[]\'\n" +
"----------\n");
}
public void testBug459967_Array_clone() {
runConformTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface FI<T> {\n" +
" T @NonNull[] getArray(T[] orig);" +
"}\n" +
"public class X {\n" +
" void consumer(FI<String> fis) {}\n" +
" void test() {\n" +
" consumer(String[]::clone);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug459967_Array_clone_b() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface FI<T> {\n" +
" @NonNull T @NonNull[] getArray(T[] orig);" +
"}\n" +
"public class X {\n" +
" void consumer(FI<String> fis) {}\n" +
" void test() {\n" +
" consumer(String[]::clone);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in X.java (at line 7)\n" +
" consumer(String[]::clone);\n" +
" ^^^^^^^^^^^^^^^\n" +
"Null type safety at method return type: Method descriptor FI<String>.getArray(String[]) promises \'@NonNull String @NonNull[]\' but referenced method provides \'String @NonNull[]\'\n" +
"----------\n");
}
public void testBug448709_allocationExpression1() {
// inference prioritizes constraint (<@Nullable T>) over expected type (@NonNull String), hence a null type mismatch results
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"interface F0<T> {}\n" +
"class FI<@Nullable T> implements F0<T> {\n" +
"}\n" +
"public abstract class X {\n" +
" abstract <Z> Z zork(F0<Z> f);\n" +
" @NonNull String test() {\n" +
" return zork(new FI<>());\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 8)\n" +
" return zork(new FI<>());\n" +
" ^^^^^^^^^^\n" +
"Null type mismatch (type annotations): required \'F0<@NonNull String>\' but this expression has type \'FI<@Nullable String>\', corresponding supertype is \'F0<@Nullable String>\'\n" +
"----------\n");
}
public void testBug448709_allocationExpression2() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"class F {\n" +
" <@Nullable U> F(U arg1, U arg2) {}\n" +
"}\n" +
"public class X {\n" +
" F f = new <@NonNull Integer>F(1,2);\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 6)\n" +
" F f = new <@NonNull Integer>F(1,2);\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@NonNull Integer\' is not a valid substitute for the type parameter \'@Nullable U\'\n" +
"----------\n");
}
public void testBug448709_allocationExpression3() {
runNegativeTestWithLibs(
new String[] {
"X.java",
"import org.eclipse.jdt.annotation.*;\n" +
"public class X {\n" +
" class F {\n" +
" <@Nullable U> F(U arg1, U arg2) {}\n" +
" }\n" +
" F f = this.new <@NonNull Integer>F(1,2);\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in X.java (at line 6)\n" +
" F f = this.new <@NonNull Integer>F(1,2);\n" +
" ^^^^^^^^^^^^^^^^\n" +
"Null constraint mismatch: The type \'@NonNull Integer\' is not a valid substitute for the type parameter \'@Nullable U\'\n" +
"----------\n");
}
public void testBug465513() {
runConformTestWithLibs(
new String[] {
"pack1/A.java",
"package pack1;\r\n" +
"import java.math.BigInteger;\r\n" +
"\r\n" +
"interface A { Object m(Class c); }\r\n" +
"interface B<S extends Number> { Object m(Class<S> c); }\r\n" +
"interface C<T extends BigInteger> { Object m(Class<T> c); }\r\n" +
"@FunctionalInterface\r\n" +
"interface D<S,T> extends A, B<BigInteger>, C<BigInteger> {}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in pack1\\A.java (at line 4)\n" +
" interface A { Object m(Class c); }\n" +
" ^^^^^\n" +
"Class is a raw type. References to generic type Class<T> should be parameterized\n" +
"----------\n");
}
public void testBug455180() {
runNegativeTestWithLibs(
new String[] {
"projA/GenericType.java",
"package projA;\n"+
"public class GenericType<T> {\n" +
"}\n",
"projA/ClassWithRawUsage.java",
"package projA;\n"+
"@org.eclipse.jdt.annotation.NonNullByDefault\n"+
"public class ClassWithRawUsage {\n"+
" public java.util.List<GenericType> method() {\n"+
" throw new RuntimeException();\n"+
" }\n"+
"}\n"
},
"----------\n" +
"1. WARNING in projA\\ClassWithRawUsage.java (at line 4)\n" +
" public java.util.List<GenericType> method() {\n" +
" ^^^^^^^^^^^\n" +
"GenericType is a raw type. References to generic type GenericType<T> should be parameterized\n" +
"----------\n");
runNegativeTestWithLibs(
new String[] {
"projB/ClassThatImports.java",
"package projB;\n" +
"import projA.ClassWithRawUsage;\n" +
"import projA.GenericType;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"public class ClassThatImports {\n" +
" void test(ClassWithRawUsage cwru) {\n" +
" @NonNull GenericType gt = cwru.method().get(0);\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in projB\\ClassThatImports.java (at line 7)\n" +
" @NonNull GenericType gt = cwru.method().get(0);\n" +
" ^^^^^^^^^^^\n" +
"GenericType is a raw type. References to generic type GenericType<T> should be parameterized\n" +
"----------\n");
}
public void testBug455180WithOtherAnnotation() {
runConformTestWithLibs(
new String[] {
"proj0/MyAnnotation.java",
"package proj0;\n"+
"@java.lang.annotation.Retention(java.lang.annotation.RetentionPolicy.CLASS)"+
"@java.lang.annotation.Target({ java.lang.annotation.ElementType.TYPE_USE })"+
"public @interface MyAnnotation {}"
}, null, "");
runNegativeTestWithLibs(
new String[] {
"projA/GenericType.java",
"package projA;\n"+
"public class GenericType<T> {\n" +
"}\n",
"projA/ClassWithRawUsage.java",
"package projA;\n"+
"public class ClassWithRawUsage {\n"+
" public java.util.List<@proj0.MyAnnotation GenericType> method() {\n"+
" throw new RuntimeException();\n"+
" }\n"+
"}\n"
},
"----------\n" +
"1. WARNING in projA\\ClassWithRawUsage.java (at line 3)\n" +
" public java.util.List<@proj0.MyAnnotation GenericType> method() {\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"GenericType is a raw type. References to generic type GenericType<T> should be parameterized\n" +
"----------\n");
runNegativeTestWithLibs(
new String[] {
"projB/ClassThatImports.java",
"package projB;\n" +
"import projA.ClassWithRawUsage;\n" +
"import projA.GenericType;\n" +
"public class ClassThatImports {\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in projB\\ClassThatImports.java (at line 2)\n" +
" import projA.ClassWithRawUsage;\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^\n" +
"The import projA.ClassWithRawUsage is never used\n" +
"----------\n" +
"2. WARNING in projB\\ClassThatImports.java (at line 3)\n" +
" import projA.GenericType;\n" +
" ^^^^^^^^^^^^^^^^^\n" +
"The import projA.GenericType is never used\n" +
"----------\n");
}
// original test, witnessing NPE
public void testBug466713() {
runConformTestWithLibs(
new String[] {
"Bug.java",
"class Bug {\n" +
" java.util.Iterator<int @org.eclipse.jdt.annotation.Nullable []> x;\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// variant to ensure we are still reporting the error at the other location
public void testBug466713b() {
runNegativeTestWithLibs(
new String[] {
"Bug.java",
"import org.eclipse.jdt.annotation.*;\n" +
"class Bug {\n" +
" java.util.Iterator<@Nullable int @Nullable []> x;\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Bug.java (at line 3)\n" +
" java.util.Iterator<@Nullable int @Nullable []> x;\n" +
" ^^^^^^^^^\n" +
"The nullness annotation @Nullable is not applicable for the primitive type int\n" +
"----------\n");
}
// variant to ensure we are not complaining against an unrelated annotation
public void testBug466713c() {
runConformTestWithLibs(
new String[] {
"MyAnnot.java",
"import java.lang.annotation.*;\n" +
"@Retention(RetentionPolicy.CLASS)\n" +
"@Target(ElementType.TYPE_USE)\n" +
"@interface MyAnnot {}\n",
"Bug.java",
"class Bug {\n" +
" java.util.Iterator<@MyAnnot int @org.eclipse.jdt.annotation.Nullable []> x;\n" +
"}\n"
},
getCompilerOptions(),
"");
}
// variant for https://bugs.eclipse.org/bugs/show_bug.cgi?id=466713#c5
public void testBug466713d() {
runNegativeTestWithLibs(
new String[] {
"MyAnnot.java",
"import java.lang.annotation.*;\n" +
"@Retention(RetentionPolicy.CLASS)\n" +
"@Target(ElementType.TYPE_USE)\n" +
"@interface MyAnnot {}\n",
"Bug.java",
"class Bug {\n" +
" boolean test(Object o) {\n" +
" return o instanceof java.util.Iterator<java.lang. @MyAnnot @org.eclipse.jdt.annotation.Nullable String>;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. ERROR in Bug.java (at line 3)\n" +
" return o instanceof java.util.Iterator<java.lang. @MyAnnot @org.eclipse.jdt.annotation.Nullable String>;\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Cannot perform instanceof check against parameterized type Iterator<String>. Use the form Iterator<?> instead since further generic type information will be erased at runtime\n" +
"----------\n" +
"2. ERROR in Bug.java (at line 3)\n" +
" return o instanceof java.util.Iterator<java.lang. @MyAnnot @org.eclipse.jdt.annotation.Nullable String>;\n" +
" ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n" +
"Nullness annotations are not applicable at this location \n" +
"----------\n");
}
public void testBug467032() {
runConformTestWithLibs(
new String[] {
"Class1.java",
"class Class1 {;\n"+
" enum E {}\n"+
" void m1(E @org.eclipse.jdt.annotation.Nullable [] a) {}\n"+
"}\n"
}, getCompilerOptions(), "");
runConformTestWithLibs(
new String[] {
"Class2.java",
"class Class2 {;\n"+
" Class1 x;"+
"}\n"
}, getCompilerOptions(), "");
}
public void testBug446217() {
runConformTestWithLibs(
new String[] {
"sol/package-info.java",
"@org.eclipse.jdt.annotation.NonNullByDefault\n" +
"package sol;",
"sol/FuncList.java",
"\n" +
"package sol;\n" +
"\n" +
"interface FuncList<A> {}\n" +
" \n" +
"@SuppressWarnings(\"unused\")\n" +
"final class Node<A> implements FuncList<A> {\n" +
" private final A a;\n" +
" private final FuncList<A> tail;\n" +
" \n" +
" Node(final A a, final FuncList<A> tail) {\n" +
" this.a = a;\n" +
" this.tail = tail;\n" +
" }\n" +
"}\n" +
"\n" +
"final class Empty<A> implements FuncList<A> {\n" +
" Empty() {}\n" +
"}\n",
"sol/Test.java",
"package sol;\n" +
"\n" +
"public class Test {\n" +
" public static void main(final String[] args) {\n" +
" System.out.println(new Node<>(\"A\", new Empty<>()));\n" +
" }\n" +
"}\n"
},
getCompilerOptions(), "");
}
public void testBug456584() {
runConformTestWithLibs(
new String[] {
"Test.java",
"import java.util.*;\n" +
"import java.util.function.*;\n" +
"import org.eclipse.jdt.annotation.*;\n" +
"\n" +
"@NonNullByDefault\n" +
"public class Test {\n" +
"\n" +
" public static final <T,R> @NonNull R applyRequired(final T input, final Function<? super T,? extends R> function) { // Warning on '@NonNull R': \"The nullness annotation is redundant with a default that applies to this location\"\n" +
" return Objects.requireNonNull(function.apply(input));\n" +
" }\n" +
"\n" +
"}\n"
},
getCompilerOptions(),
"----------\n" +
"1. WARNING in Test.java (at line 9)\n" +
" return Objects.requireNonNull(function.apply(input));\n" +
" ^^^^^^^^^^^^^^^^^^^^^\n" +
"Null type safety (type annotations): The expression of type \'capture#of ? extends R\' needs unchecked conversion to conform to \'@NonNull capture#of ? extends R\'\n" +
"----------\n");
}
public void testBug447661() {
runConformTestWithLibs(
new String[] {
"Two.java",
"import java.util.*;\n" +
"public class Two {\n" +
"\n" +
" @org.eclipse.jdt.annotation.NonNullByDefault\n" +
" public static Set<String> getSet() {\n" +
" return new HashSet<>();\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
runConformTestWithLibs(
new String[] {
"One.java",
"import java.util.*;\n" +
"@org.eclipse.jdt.annotation.NonNullByDefault\n" +
"public class One {\n" +
"\n" +
" public void test() {\n" +
" Set<String> set = Two.getSet();\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug436091() {
runConformTestWithLibs(
new String[] {
"p/package-info.java",
"@org.eclipse.jdt.annotation.NonNullByDefault\n" +
"package p;\n",
"p/Program.java",
"package p;\n" +
"public class Program {\n" +
" private final ProgramNode program;\n" +
" " +
" public Program(final ProgramNode astRoot) {\n" +
" program = astRoot;\n" +
" }\n" +
" " +
" public Integer execute() {\n" +
" return program.accept(ExecutionEvaluationVisitor.VISITOR);\n" +
" }\n" +
" " +
" class ProgramNode {\n" +
" public <R> R accept(final ConcreteNodeVisitor<R> visitor) {\n" +
" return visitor.visit(this);\n" +
" }\n" +
" }\n" +
"}\n",
"p/ConcreteNodeVisitor.java",
"package p;\n" +
"import p.Program.ProgramNode;\n" +
"public interface ConcreteNodeVisitor<R> {\n" +
" R visit(ProgramNode node);\n" +
"}\n",
"p/ExecutionEvaluationVisitor.java",
"package p;\n" +
"" +
"import org.eclipse.jdt.annotation.NonNull;\n" +
"" +
"import p.Program.ProgramNode;\n" +
"" +
"public enum ExecutionEvaluationVisitor implements ConcreteNodeVisitor<Integer> {\n" +
" " +
" VISITOR;\n" +
" " +
" @Override" +
" public Integer visit(final ProgramNode node) {\n" +
" @SuppressWarnings(\"null\")\n" +
" @NonNull\n" +
" final Integer i = Integer.valueOf(0);\n" +
" return i;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
// re-compile only one of the above:
runConformTestWithLibs(
new String[] {
"p/Program.java",
"package p;\n" +
"public class Program {\n" +
" private final ProgramNode program;\n" +
" " +
" public Program(final ProgramNode astRoot) {\n" +
" program = astRoot;\n" +
" }\n" +
" " +
" public Integer execute() {\n" +
" return program.accept(ExecutionEvaluationVisitor.VISITOR);\n" +
" }\n" +
" " +
" class ProgramNode {\n" +
" public <R> R accept(final ConcreteNodeVisitor<R> visitor) {\n" +
" return visitor.visit(this);\n" +
" }\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
public void testBug474239() {
Map options = getCompilerOptions();
options.put(JavaCore.COMPILER_PB_REDUNDANT_NULL_CHECK, JavaCore.ERROR);
options.put(JavaCore.COMPILER_PB_SYNTACTIC_NULL_ANALYSIS_FOR_FIELDS, JavaCore.ENABLED);
runConformTestWithLibs(
new String[] {
"Test.java",
"public class Test {\n" +
" static String s1 = null, s2 = null;\n" +
"\n" +
" public static void main(String[] args) {\n" +
" int val = (int) System.currentTimeMillis();\n" +
" switch (val % 2) {\n" +
" case 0:\n" +
" if (s1 != null)\n" +
" s2 = \"\";\n" +
" break;\n" +
" case 1:\n" +
" if (s1 != null) // compiler thinks s1 is never null at this point\n" +
" throw new RuntimeException(\"\");\n" +
" break;\n" +
" }\n" +
" }\n" +
"}\n"
},
options,
"");
}
public void testBug474239b() {
Map options = getCompilerOptions();
options.put(JavaCore.COMPILER_PB_REDUNDANT_NULL_CHECK, JavaCore.ERROR);
options.put(JavaCore.COMPILER_PB_SYNTACTIC_NULL_ANALYSIS_FOR_FIELDS, JavaCore.ENABLED);
runConformTestWithLibs(
new String[] {
"Test.java",
"public class Test {\n" +
" static String s2 = null;\n" +
"\n" +
" public static void main(String[] args) {\n" +
" int val = (int) System.currentTimeMillis();\n" +
" switch (val % 2) {\n" +
" case 0:\n" +
" s2 = \"\";\n" +
" break;\n" +
" case 1:\n" +
" if (s2 != null)\n" +
" throw new RuntimeException(\"\");\n" +
" break;\n" +
" }\n" +
" }\n" +
"}\n"
},
options,
"");
}
public void testBug472663() {
runConformTestWithLibs(
new String[] {
"test/Callee.java",
"package test;\n" +
"\n" +
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"\n" +
"@NonNullByDefault\n" +
"public class Callee {\n" +
" public static String staticOtherClass(String foo) {\n" +
" return foo;\n" +
" }\n" +
"\n" +
" public String instanceOtherClass(String foo) {\n" +
" return foo;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
// and now consume Callee.class:
runConformTestWithLibs(
new String[] {
"test/Caller.java",
"package test;\n" +
"\n" +
"import java.util.function.Function;\n" +
"\n" +
"import org.eclipse.jdt.annotation.NonNullByDefault;\n" +
"\n" +
"@NonNullByDefault\n" +
"public class Caller {\n" +
" public void foo(final Callee callee) {\n" +
" Function<String, String> function;\n" +
"\n" +
" // assignments with warnings (wrong):\n" +
" function = Callee::staticOtherClass;\n" +
" function = callee::instanceOtherClass;\n" +
"\n" +
" // assignments with no warnings (ok):\n" +
" function = foo -> Callee.staticOtherClass(foo);\n" +
" function = foo -> callee.instanceOtherClass(foo);\n" +
" function = Caller::staticSameClass;\n" +
" function = this::instanceSameClass;\n" +
" }\n" +
"\n" +
" public static String staticSameClass(String foo) {\n" +
" return foo;\n" +
" }\n" +
"\n" +
" public String instanceSameClass(String foo) {\n" +
" return foo;\n" +
" }\n" +
"}\n"
},
getCompilerOptions(),
"");
}
}