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<h2 title="Class ThreadUtils" class="title">Class ThreadUtils</h2>
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<pre>public class <span class="typeNameLabel">ThreadUtils</span>
extends <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang" class="externalLink">Object</a></pre>
<div class="block"><p>
 Helpers for <code>java.lang.Thread</code> and <code>java.lang.ThreadGroup</code>.
 </p>
 <p>
 #ThreadSafe#
 </p></div>
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<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>3.5</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink"><code>Thread</code></a>, 
<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink"><code>ThreadGroup</code></a></dd>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.NamePredicate.html" title="class in org.apache.commons.lang3">ThreadUtils.NamePredicate</a></span></code></th>
<td class="colLast">
<div class="block">A predicate implementation which matches a thread or threadgroup name.</div>
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<td class="colFirst"><code>static interface&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.ThreadGroupPredicate.html" title="interface in org.apache.commons.lang3">ThreadUtils.ThreadGroupPredicate</a></span></code></th>
<td class="colLast">
<div class="block">A predicate for selecting threadgroups.</div>
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<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.ThreadIdPredicate.html" title="class in org.apache.commons.lang3">ThreadUtils.ThreadIdPredicate</a></span></code></th>
<td class="colLast">
<div class="block">A predicate implementation which matches a thread id.</div>
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<tr class="rowColor">
<td class="colFirst"><code>static interface&nbsp;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.ThreadPredicate.html" title="interface in org.apache.commons.lang3">ThreadUtils.ThreadPredicate</a></span></code></th>
<td class="colLast">
<div class="block">A predicate for selecting threads.</div>
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<td class="colFirst"><code>static org.apache.commons.lang3.ThreadUtils.AlwaysTruePredicate</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#ALWAYS_TRUE_PREDICATE">ALWAYS_TRUE_PREDICATE</a></span></code></th>
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<div class="block">Predicate which always returns true.</div>
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<th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#ThreadUtils--">ThreadUtils</a></span>()</code></th>
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 ThreadUtils instances should NOT be constructed in standard programming.</div>
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<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#findThreadById-long-">findThreadById</a></span>&#8203;(long&nbsp;threadId)</code></th>
<td class="colLast">
<div class="block">Return the active thread with the specified id.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#findThreadById-long-java.lang.String-">findThreadById</a></span>&#8203;(long&nbsp;threadId,
              <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;threadGroupName)</code></th>
<td class="colLast">
<div class="block">Return the active thread with the specified id if it belong's to a thread group with the specified group name.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#findThreadById-long-java.lang.ThreadGroup-">findThreadById</a></span>&#8203;(long&nbsp;threadId,
              <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&nbsp;threadGroup)</code></th>
<td class="colLast">
<div class="block">Return the active thread with the specified id if it belong's to the specified thread group.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#findThreadGroups-java.lang.ThreadGroup-boolean-org.apache.commons.lang3.ThreadUtils.ThreadGroupPredicate-">findThreadGroups</a></span>&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&nbsp;group,
                boolean&nbsp;recurse,
                <a href="../../../../org/apache/commons/lang3/ThreadUtils.ThreadGroupPredicate.html" title="interface in org.apache.commons.lang3">ThreadUtils.ThreadGroupPredicate</a>&nbsp;predicate)</code></th>
<td class="colLast">
<div class="block">Select all active threadgroups which match the given predicate and which is a subgroup of the given thread group (or one of its subgroups).</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#findThreadGroups-org.apache.commons.lang3.ThreadUtils.ThreadGroupPredicate-">findThreadGroups</a></span>&#8203;(<a href="../../../../org/apache/commons/lang3/ThreadUtils.ThreadGroupPredicate.html" title="interface in org.apache.commons.lang3">ThreadUtils.ThreadGroupPredicate</a>&nbsp;predicate)</code></th>
<td class="colLast">
<div class="block">Select all active threadgroups which match the given predicate.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#findThreadGroupsByName-java.lang.String-">findThreadGroupsByName</a></span>&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;threadGroupName)</code></th>
<td class="colLast">
<div class="block">Return active thread groups with the specified group name.</div>
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</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#findThreads-java.lang.ThreadGroup-boolean-org.apache.commons.lang3.ThreadUtils.ThreadPredicate-">findThreads</a></span>&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&nbsp;group,
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<div class="block">Select all active threads which match the given predicate and which belongs to the given thread group (or one of its subgroups).</div>
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<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#findThreads-org.apache.commons.lang3.ThreadUtils.ThreadPredicate-">findThreads</a></span>&#8203;(<a href="../../../../org/apache/commons/lang3/ThreadUtils.ThreadPredicate.html" title="interface in org.apache.commons.lang3">ThreadUtils.ThreadPredicate</a>&nbsp;predicate)</code></th>
<td class="colLast">
<div class="block">Select all active threads which match the given predicate.</div>
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<tr id="i8" class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&gt;</code></td>
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<td class="colLast">
<div class="block">Return active threads with the specified name.</div>
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<tr id="i9" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&gt;</code></td>
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<td class="colLast">
<div class="block">Return active threads with the specified name if they belong to a thread group with the specified group name.</div>
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<tr id="i10" class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#findThreadsByName-java.lang.String-java.lang.ThreadGroup-">findThreadsByName</a></span>&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;threadName,
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<td class="colLast">
<div class="block">Return active threads with the specified name if they belong to a specified thread group.</div>
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<tr id="i11" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&gt;</code></td>
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<td class="colLast">
<div class="block">Return all active thread groups excluding the system thread group (A thread group is active if it has been not destroyed).</div>
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</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&gt;</code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#getAllThreads--">getAllThreads</a></span>()</code></th>
<td class="colLast">
<div class="block">Return all active threads (A thread is active if it has been started and has not yet died).</div>
</td>
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<tr id="i13" class="rowColor">
<td class="colFirst"><code>static <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a></code></td>
<th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="../../../../org/apache/commons/lang3/ThreadUtils.html#getSystemThreadGroup--">getSystemThreadGroup</a></span>()</code></th>
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<div class="block">Return the system thread group (sometimes also referred as "root thread group").</div>
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<code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang" class="externalLink">clone</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang" class="externalLink">equals</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang" class="externalLink">finalize</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang" class="externalLink">getClass</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang" class="externalLink">hashCode</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang" class="externalLink">notify</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang" class="externalLink">notifyAll</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang" class="externalLink">toString</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang" class="externalLink">wait</a>, <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang" class="externalLink">wait</a></code></li>
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<pre>public static final&nbsp;org.apache.commons.lang3.ThreadUtils.AlwaysTruePredicate ALWAYS_TRUE_PREDICATE</pre>
<div class="block">Predicate which always returns true.</div>
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<pre>public&nbsp;ThreadUtils()</pre>
<div class="block"><p>
 ThreadUtils instances should NOT be constructed in standard programming. Instead, the class should be used as
 <code>ThreadUtils.getAllThreads()</code>
 </p>
 <p>
 This constructor is public to permit tools that require a JavaBean instance to operate.
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&nbsp;findThreadById&#8203;(long&nbsp;threadId,
                                    <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&nbsp;threadGroup)</pre>
<div class="block">Return the active thread with the specified id if it belong's to the specified thread group.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>threadId</code> - The thread id</dd>
<dd><code>threadGroup</code> - The thread group</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The thread which belongs to a specified thread group and the thread's id match the specified id.
 <code>null</code> is returned if no such thread exists</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the specified id is zero or negative or the group is null</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot access the system thread group</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&nbsp;findThreadById&#8203;(long&nbsp;threadId,
                                    <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;threadGroupName)</pre>
<div class="block">Return the active thread with the specified id if it belong's to a thread group with the specified group name.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>threadId</code> - The thread id</dd>
<dd><code>threadGroupName</code> - The thread group name</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The threads which belongs to a thread group with the specified group name and the thread's id match the specified id.
 <code>null</code> is returned if no such thread exists</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the specified id is zero or negative or the group name is null</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot access the system thread group</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&gt;&nbsp;findThreadsByName&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;threadName,
                                                   <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&nbsp;threadGroup)</pre>
<div class="block">Return active threads with the specified name if they belong to a specified thread group.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>threadName</code> - The thread name</dd>
<dd><code>threadGroup</code> - The thread group</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The threads which belongs to a thread group and the thread's name match the specified name,
 An empty collection is returned if no such thread exists. The collection returned is always unmodifiable.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the specified thread name or group is null</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot access the system thread group</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&gt;&nbsp;findThreadsByName&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;threadName,
                                                   <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;threadGroupName)</pre>
<div class="block">Return active threads with the specified name if they belong to a thread group with the specified group name.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>threadName</code> - The thread name</dd>
<dd><code>threadGroupName</code> - The thread group name</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The threads which belongs to a thread group with the specified group name and the thread's name match the specified name,
 An empty collection is returned if no such thread exists. The collection returned is always unmodifiable.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the specified thread name or group name is null</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot access the system thread group</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&gt;&nbsp;findThreadGroupsByName&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;threadGroupName)</pre>
<div class="block">Return active thread groups with the specified group name.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>threadGroupName</code> - The thread group name</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the thread groups with the specified group name or an empty collection if no such thread group exists. The collection returned is always unmodifiable.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if group name is null</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot access the system thread group</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&gt;&nbsp;getAllThreadGroups()</pre>
<div class="block">Return all active thread groups excluding the system thread group (A thread group is active if it has been not destroyed).</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>all thread groups excluding the system thread group. The collection returned is always unmodifiable.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot access the system thread group</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&nbsp;getSystemThreadGroup()</pre>
<div class="block">Return the system thread group (sometimes also referred as "root thread group").</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the system thread group</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&gt;&nbsp;getAllThreads()</pre>
<div class="block">Return all active threads (A thread is active if it has been started and has not yet died).</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>all active threads. The collection returned is always unmodifiable.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot access the system thread group</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&gt;&nbsp;findThreadsByName&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang" class="externalLink">String</a>&nbsp;threadName)</pre>
<div class="block">Return active threads with the specified name.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>threadName</code> - The thread name</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The threads with the specified name or an empty collection if no such thread exists. The collection returned is always unmodifiable.</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the specified name is null</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot access the system thread group</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&nbsp;findThreadById&#8203;(long&nbsp;threadId)</pre>
<div class="block">Return the active thread with the specified id.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>threadId</code> - The thread id</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The thread with the specified id or <code>null</code> if no such thread exists</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the specified id is zero or negative</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot access the system thread group</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&gt;&nbsp;findThreads&#8203;(<a href="../../../../org/apache/commons/lang3/ThreadUtils.ThreadPredicate.html" title="interface in org.apache.commons.lang3">ThreadUtils.ThreadPredicate</a>&nbsp;predicate)</pre>
<div class="block">Select all active threads which match the given predicate.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>predicate</code> - the predicate</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An unmodifiable <code>Collection</code> of active threads matching the given predicate</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the predicate is null</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot access the system thread group</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&gt;&nbsp;findThreadGroups&#8203;(<a href="../../../../org/apache/commons/lang3/ThreadUtils.ThreadGroupPredicate.html" title="interface in org.apache.commons.lang3">ThreadUtils.ThreadGroupPredicate</a>&nbsp;predicate)</pre>
<div class="block">Select all active threadgroups which match the given predicate.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>predicate</code> - the predicate</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An unmodifiable <code>Collection</code> of active threadgroups matching the given predicate</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the predicate is null</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot access the system thread group</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Thread.html?is-external=true" title="class or interface in java.lang" class="externalLink">Thread</a>&gt;&nbsp;findThreads&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&nbsp;group,
                                             boolean&nbsp;recurse,
                                             <a href="../../../../org/apache/commons/lang3/ThreadUtils.ThreadPredicate.html" title="interface in org.apache.commons.lang3">ThreadUtils.ThreadPredicate</a>&nbsp;predicate)</pre>
<div class="block">Select all active threads which match the given predicate and which belongs to the given thread group (or one of its subgroups).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>group</code> - the thread group</dd>
<dd><code>recurse</code> - if <code>true</code> then evaluate the predicate recursively on all threads in all subgroups of the given group</dd>
<dd><code>predicate</code> - the predicate</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An unmodifiable <code>Collection</code> of active threads which match the given predicate and which belongs to the given thread group</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the given group or predicate is null</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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<pre>public static&nbsp;<a href="https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html?is-external=true" title="class or interface in java.util" class="externalLink">Collection</a>&lt;<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&gt;&nbsp;findThreadGroups&#8203;(<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/ThreadGroup.html?is-external=true" title="class or interface in java.lang" class="externalLink">ThreadGroup</a>&nbsp;group,
                                                       boolean&nbsp;recurse,
                                                       <a href="../../../../org/apache/commons/lang3/ThreadUtils.ThreadGroupPredicate.html" title="interface in org.apache.commons.lang3">ThreadUtils.ThreadGroupPredicate</a>&nbsp;predicate)</pre>
<div class="block">Select all active threadgroups which match the given predicate and which is a subgroup of the given thread group (or one of its subgroups).</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>group</code> - the thread group</dd>
<dd><code>recurse</code> - if <code>true</code> then evaluate the predicate recursively on all threadgroups in all subgroups of the given group</dd>
<dd><code>predicate</code> - the predicate</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>An unmodifiable <code>Collection</code> of active threadgroups which match the given predicate and which is a subgroup of the given thread group</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang" class="externalLink">IllegalArgumentException</a></code> - if the given group or predicate is null</dd>
<dd><code><a href="https://docs.oracle.com/javase/7/docs/api/java/lang/SecurityException.html?is-external=true" title="class or interface in java.lang" class="externalLink">SecurityException</a></code> - if the current thread cannot modify
          thread groups from this thread's thread group up to the system thread group</dd>
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