Bug 563526: require Java 7 for building

Signed-off-by: Maarten Mulders <m.th.mulders@xs4all.nl>
diff --git a/pom.xml b/pom.xml
index dc30ee3..dc46c70 100644
--- a/pom.xml
+++ b/pom.xml
@@ -84,8 +84,8 @@
   </ciManagement>
 
   <properties>
-    <maven.compiler.source>1.6</maven.compiler.source>
-    <maven.compiler.target>1.6</maven.compiler.target>
+    <maven.compiler.source>1.7</maven.compiler.source>
+    <maven.compiler.target>1.7</maven.compiler.target>
     <tycho.scmUrl>scm:git:http://git.eclipse.org/gitroot/sisu/org.eclipse.sisu.plexus.git</tycho.scmUrl>
     <tycho-version>1.0.0</tycho-version>
   </properties>
@@ -100,13 +100,13 @@
           <configuration>
             <signature>
               <groupId>org.codehaus.mojo.signature</groupId>
-              <artifactId>java16</artifactId>
-              <version>1.1</version>
+              <artifactId>java17</artifactId>
+              <version>1.0</version>
             </signature>
           </configuration>
           <executions>
             <execution>
-              <id>check-java6</id>
+              <id>check-java7</id>
               <phase>package</phase>
               <goals>
                 <goal>check</goal>
@@ -120,7 +120,7 @@
           <configuration>
             <rules>
               <enforceBytecodeVersion>
-                <maxJdkVersion>1.6</maxJdkVersion>
+                <maxJdkVersion>1.7</maxJdkVersion>
               </enforceBytecodeVersion>
             </rules>
           </configuration>
@@ -137,7 +137,7 @@
           <artifactId>target-platform-configuration</artifactId>
           <version>${tycho-version}</version>
           <configuration>
-            <executionEnvironment>JavaSE-1.6</executionEnvironment>
+            <executionEnvironment>JavaSE-1.7</executionEnvironment>
             <target>
               <artifact>
                 <groupId>org.eclipse.sisu</groupId>
@@ -303,7 +303,7 @@
             <excludePackageNames>*.internal,org.codehaus.*</excludePackageNames>
             <additionalparam>
               -quiet
-              -federate JDK http://docs.oracle.com/javase/6/docs/api/index.html?
+              -federate JDK http://docs.oracle.com/javase/7/docs/api/index.html?
               -federationxml JDK http://doclava.googlecode.com/svn/static/api/openjdk-6.xml
               -federate Guice http://google-guice.googlecode.com/git-history/3.0/javadoc
               -hdf project.name "${project.name}"