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<h2 title="Interface JavaReference" class="title">Interface JavaReference</h2>
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<dt>All Known Implementing Classes:</dt>
<dd><code><a href="../../j9ddr/vm29/view/dtfj/java/DTFJJavaReference.html" title="class in com.ibm.j9ddr.vm29.view.dtfj.java">DTFJJavaReference</a></code>, <code><a href="j9/JavaReference.html" title="class in com.ibm.dtfj.java.j9">JavaReference</a></code></dd>
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<pre>public interface <span class="typeNameLabel">JavaReference</span></pre>
<div class="block">Represents a Java reference.</div>
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<h3>Field Summary</h3>
<table class="memberSummary">
<caption><span>Fields</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Field</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#HEAP_ROOT_CLASSLOADER">HEAP_ROOT_CLASSLOADER</a></span></code></th>
<td class="colLast">
<div class="block">Classloader heap root</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#HEAP_ROOT_FINALIZABLE_OBJ">HEAP_ROOT_FINALIZABLE_OBJ</a></span></code></th>
<td class="colLast">
<div class="block">Finalizable object heap root</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#HEAP_ROOT_JNI_GLOBAL">HEAP_ROOT_JNI_GLOBAL</a></span></code></th>
<td class="colLast">
<div class="block">JNI global reference heap root</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#HEAP_ROOT_JNI_LOCAL">HEAP_ROOT_JNI_LOCAL</a></span></code></th>
<td class="colLast">
<div class="block">JNI local reference heap root</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#HEAP_ROOT_MONITOR">HEAP_ROOT_MONITOR</a></span></code></th>
<td class="colLast">
<div class="block">Monitor heap root</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#HEAP_ROOT_OTHER">HEAP_ROOT_OTHER</a></span></code></th>
<td class="colLast">
<div class="block">Other heap root type</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#HEAP_ROOT_STACK_LOCAL">HEAP_ROOT_STACK_LOCAL</a></span></code></th>
<td class="colLast">
<div class="block">Stack local heap root</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#HEAP_ROOT_STRINGTABLE">HEAP_ROOT_STRINGTABLE</a></span></code></th>
<td class="colLast">
<div class="block">Stringtable heap root</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#HEAP_ROOT_SYSTEM_CLASS">HEAP_ROOT_SYSTEM_CLASS</a></span></code></th>
<td class="colLast">
<div class="block">System class heap root</div>
</td>
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<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#HEAP_ROOT_THREAD">HEAP_ROOT_THREAD</a></span></code></th>
<td class="colLast">
<div class="block">Thread heap root</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#HEAP_ROOT_UNFINALIZED_OBJ">HEAP_ROOT_UNFINALIZED_OBJ</a></span></code></th>
<td class="colLast">
<div class="block">Unfinalized object heap root</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#HEAP_ROOT_UNKNOWN">HEAP_ROOT_UNKNOWN</a></span></code></th>
<td class="colLast">
<div class="block">Unknown heap root type</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REACHABILITY_PHANTOM">REACHABILITY_PHANTOM</a></span></code></th>
<td class="colLast">
<div class="block">Reachability of target object via this reference is Phantom</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REACHABILITY_SOFT">REACHABILITY_SOFT</a></span></code></th>
<td class="colLast">
<div class="block">Reachability of target object via this reference is Soft</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REACHABILITY_STRONG">REACHABILITY_STRONG</a></span></code></th>
<td class="colLast">
<div class="block">Reachability of target object via this reference is Strong</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REACHABILITY_UNKNOWN">REACHABILITY_UNKNOWN</a></span></code></th>
<td class="colLast">
<div class="block">Reachability of target object via this reference is unknown</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REACHABILITY_WEAK">REACHABILITY_WEAK</a></span></code></th>
<td class="colLast">
<div class="block">Reachability of target object via this reference is Weak</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_ARRAY_ELEMENT">REFERENCE_ARRAY_ELEMENT</a></span></code></th>
<td class="colLast">
<div class="block">Reference from an array to one of its elements</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_ASSOCIATED_CLASS">REFERENCE_ASSOCIATED_CLASS</a></span></code></th>
<td class="colLast">
<div class="block">Reference from a JavaObject representing a Class to the associated JavaClass</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_CLASS">REFERENCE_CLASS</a></span></code></th>
<td class="colLast">
<div class="block">Reference from an object to its class</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_CLASS_LOADER">REFERENCE_CLASS_LOADER</a></span></code></th>
<td class="colLast">
<div class="block">Reference from a class to its class loader</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_CLASS_OBJECT">REFERENCE_CLASS_OBJECT</a></span></code></th>
<td class="colLast">
<div class="block">Reference from a class to its java.lang.Class instance</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_CONSTANT_POOL">REFERENCE_CONSTANT_POOL</a></span></code></th>
<td class="colLast">
<div class="block">Reference from a class to a resolved entry in the constant pool</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_FIELD">REFERENCE_FIELD</a></span></code></th>
<td class="colLast">
<div class="block">Reference from an object to the value of one of its instance fields</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_INTERFACE">REFERENCE_INTERFACE</a></span></code></th>
<td class="colLast">
<div class="block">Reference from a class to one of its interfaces</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_LOADED_CLASS">REFERENCE_LOADED_CLASS</a></span></code></th>
<td class="colLast">
<div class="block">Reference from a classloader object to its loaded classes</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_PROTECTION_DOMAIN">REFERENCE_PROTECTION_DOMAIN</a></span></code></th>
<td class="colLast">
<div class="block">Reference from a class to its protection domain</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_SIGNERS">REFERENCE_SIGNERS</a></span></code></th>
<td class="colLast">
<div class="block">Reference from a class to its signers array</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_STATIC_FIELD">REFERENCE_STATIC_FIELD</a></span></code></th>
<td class="colLast">
<div class="block">Reference from a class to the value of one of its static fields</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_SUPERCLASS">REFERENCE_SUPERCLASS</a></span></code></th>
<td class="colLast">
<div class="block">Reference from a class to its superclass</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_UNKNOWN">REFERENCE_UNKNOWN</a></span></code></th>
<td class="colLast">
<div class="block">Unknown reference type</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#REFERENCE_UNUSED_14">REFERENCE_UNUSED_14</a></span></code></th>
<td class="colLast">&nbsp;</td>
</tr>
</table>
</li>
</ul>
</section>
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<h3>Method Summary</h3>
<table class="memberSummary">
<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colSecond" scope="col">Method</th>
<th class="colLast" scope="col">Description</th>
</tr>
<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">String</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getDescription()">getDescription</a></span>()</code></th>
<td class="colLast">
<div class="block">Get a string describing the reference type.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getReachability()">getReachability</a></span>()</code></th>
<td class="colLast">
<div class="block">Get the reachability of the target object via this specific reference.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getReferenceType()">getReferenceType</a></span>()</code></th>
<td class="colLast">
<div class="block">Get the reference type, as defined in the JVMTI specification.</div>
</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getRootType()">getRootType</a></span>()</code></th>
<td class="colLast">
<div class="block">Get the root type, as defined in the JVMTI specification.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">Object</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getSource()">getSource</a></span>()</code></th>
<td class="colLast">
<div class="block">Get the source of this reference if available.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink" target="_blank">Object</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#getTarget()">getTarget</a></span>()</code></th>
<td class="colLast">
<div class="block">Get the object referred to by this reference.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isClassReference()">isClassReference</a></span>()</code></th>
<td class="colLast">
<div class="block">Does this reference point to a class?</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#isObjectReference()">isObjectReference</a></span>()</code></th>
<td class="colLast">
<div class="block">Does this reference point to an object in the heap?</div>
</td>
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<h3>Field Detail</h3>
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<h4>HEAP_ROOT_UNKNOWN</h4>
<pre>static final&nbsp;int HEAP_ROOT_UNKNOWN</pre>
<div class="block">Unknown heap root type</div>
<dl>
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<dd><a href="../../../../../constant-values.html#com.ibm.dtfj.java.JavaReference.HEAP_ROOT_UNKNOWN">Constant Field Values</a></dd>
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<div class="block">Reference from an object to its class</div>
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<div class="block">Reference from a class to its protection domain</div>
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<div class="block">Reference from a class to the value of one of its static fields</div>
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<div class="block">Reference from a class to a resolved entry in the constant pool</div>
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<div class="block">Get a string describing the reference type.
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e.g. <q>JNI Weak global reference</q>, <q>Instance field 'MyClass.value'</q>, <q>Constant pool string constant</q></div>
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<dd><code><a href="../image/CorruptDataException.html" title="class in com.ibm.dtfj.image">CorruptDataException</a></code></dd>
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<div class="block">Does this reference point to a class?</div>
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<dd><code><a href="../image/CorruptDataException.html" title="class in com.ibm.dtfj.image">CorruptDataException</a></code></dd>
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<div class="block">Get the object referred to by this reference.</div>
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<div class="block">Get the source of this reference if available.</div>
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