title: How to interpret a Java thread stack?
body: <p>In line with this question: <a href="https://stackoverflow.com/questions/3734696/how-to-get-stack-trace-of-a-thread">How to get stack trace of a thread</a></p>
  
  <p>I am wondering if anyone could point to information about interpreting Java thread stacks extracted with <code>jstack</code>.</p>
  
  <p>My situation is that I've got a Java EE 5 application running on GlassFish v2.1.1 that hangs periodically (at least 2 -3 times a day).To get it running again I have to kill the Glassfish process and start the domain again. The application usually gets slower and slower responding until it finally hangs completely. Once it has hung I can't get a thread stack.  I've been able to get a thread stack as it gets slower and slower but I can't see to locate the problem or the threads that have hung.</p>
  
  <p>Here is the latest thread dump: <a href="http://issues.i2m.dk/attachments/66/threadstack.201103211046.txt" rel="nofollow noreferrer">http://issues.i2m.dk/attachments/66/threadstack.201103211046.txt</a></p>
  
  <p>Snippet of thread dump:</p>
  
  <pre><code>"p: thread-pool-1; w: 20" daemon prio=10 tid=0x00007efd18843800 nid=0x5f89 in Object.wait() [0x00007efd03381000]
     java.lang.Thread.State: TIMED_WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl.requestWork(WorkQueueImpl.java:171)
      - locked &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:528)
  
  "TP-Processor83" daemon prio=10 tid=0x0000000043179000 nid=0x5f87 runnable [0x00007efd03583000]
     java.lang.Thread.State: RUNNABLE
      at java.net.SocketInputStream.socketRead0(Native Method)
      at java.net.SocketInputStream.read(SocketInputStream.java:129)
      at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
      at java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
      at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
      - locked &lt;0x00007efe72696090&gt; (a java.io.BufferedInputStream)
      at org.apache.jk.common.ChannelSocket.read(ChannelSocket.java:607)
      at org.apache.jk.common.ChannelSocket.receive(ChannelSocket.java:545)
      at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:672)
      at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:876)
      at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
      at java.lang.Thread.run(Thread.java:662)
  
  "p: thread-pool-1; w: 19" daemon prio=10 tid=0x00007efd18710800 nid=0x5f86 in Object.wait() [0x00007efd03684000]
     java.lang.Thread.State: TIMED_WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl.requestWork(WorkQueueImpl.java:171)
      - locked &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:528)
  
  "p: thread-pool-1; w: 18" daemon prio=10 tid=0x0000000042a5a000 nid=0x5f85 in Object.wait() [0x00007efd03785000]
     java.lang.Thread.State: TIMED_WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl.requestWork(WorkQueueImpl.java:171)
      - locked &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:528)
  
  "p: thread-pool-1; w: 17" daemon prio=10 tid=0x0000000042a57000 nid=0x5f84 in Object.wait() [0x00007efd03886000]
     java.lang.Thread.State: TIMED_WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl.requestWork(WorkQueueImpl.java:171)
      - locked &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:528)
  
  "p: thread-pool-1; w: 16" daemon prio=10 tid=0x000000004321b000 nid=0x5f83 in Object.wait() [0x00007efd03987000]
     java.lang.Thread.State: TIMED_WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl.requestWork(WorkQueueImpl.java:171)
      - locked &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:528)
  
  "p: thread-pool-1; w: 15" daemon prio=10 tid=0x0000000043219800 nid=0x5f82 in Object.wait() [0x00007efd03a88000]
     java.lang.Thread.State: TIMED_WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl.requestWork(WorkQueueImpl.java:171)
      - locked &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:528)
  
  "p: thread-pool-1; w: 14" daemon prio=10 tid=0x00000000429b6000 nid=0x5f81 in Object.wait() [0x00007efd03b89000]
     java.lang.Thread.State: TIMED_WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl.requestWork(WorkQueueImpl.java:171)
      - locked &lt;0x00007efd480fc228&gt; (a com.sun.corba.ee.impl.orbutil.threadpool.WorkQueueImpl)
      at com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread.run(ThreadPoolImpl.java:528)
  
  "TP-Processor82" daemon prio=10 tid=0x0000000043896800 nid=0x5f80 runnable [0x00007efd03c8a000]
     java.lang.Thread.State: RUNNABLE
      at java.net.SocketInputStream.socketRead0(Native Method)
      at java.net.SocketInputStream.read(SocketInputStream.java:129)
      at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
      at java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
      at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
      - locked &lt;0x00007efe72829510&gt; (a java.io.BufferedInputStream)
      at org.apache.jk.common.ChannelSocket.read(ChannelSocket.java:607)
      at org.apache.jk.common.ChannelSocket.receive(ChannelSocket.java:545)
      at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:672)
      at org.apache.jk.common.ChannelSocket$SocketConnection.runIt(ChannelSocket.java:876)
      at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
      at java.lang.Thread.run(Thread.java:662)
  
  "Thread-44980" daemon prio=10 tid=0x00007efd202c3800 nid=0x5d74 runnable [0x00007efd067b5000]
     java.lang.Thread.State: RUNNABLE
      at java.net.SocketInputStream.socketRead0(Native Method)
      at java.net.SocketInputStream.read(SocketInputStream.java:129)
      at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
      at java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
      at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
      - locked &lt;0x00007efd78fc0058&gt; (a java.io.BufferedInputStream)
      at com.sun.jndi.ldap.Connection.run(Connection.java:808)
      at java.lang.Thread.run(Thread.java:662)
  
  "Thread-44979" daemon prio=10 tid=0x00007efd20d76000 nid=0x5d73 runnable [0x00007efd062b0000]
     java.lang.Thread.State: RUNNABLE
      at java.net.SocketInputStream.socketRead0(Native Method)
      at java.net.SocketInputStream.read(SocketInputStream.java:129)
      at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
      at java.io.BufferedInputStream.read1(BufferedInputStream.java:258)
      at java.io.BufferedInputStream.read(BufferedInputStream.java:317)
      - locked &lt;0x00007efd7789a4e0&gt; (a java.io.BufferedInputStream)
      at com.sun.jndi.ldap.Connection.run(Connection.java:808)
      at java.lang.Thread.run(Thread.java:662)
  
  "TP-Monitor" daemon prio=10 tid=0x00007efd2139f800 nid=0x5b1 in Object.wait() [0x00007efd0d453000]
     java.lang.Thread.State: TIMED_WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd4d46d6c0&gt; (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
      at org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable.run(ThreadPool.java:561)
      - locked &lt;0x00007efd4d46d6c0&gt; (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
      at java.lang.Thread.run(Thread.java:662)
  
  "TP-Monitor" daemon prio=10 tid=0x00007efd20143000 nid=0x5b0 in Object.wait() [0x00007efd0d554000]
     java.lang.Thread.State: TIMED_WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd4d96dcd8&gt; (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
      at org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable.run(ThreadPool.java:561)
      - locked &lt;0x00007efd4d96dcd8&gt; (a org.apache.tomcat.util.threads.ThreadPool$MonitorRunnable)
      at java.lang.Thread.run(Thread.java:662)
  
  "httpWorkerThread-4848-48" daemon prio=10 tid=0x00007efd18a82800 nid=0x5aa in Object.wait() [0x00007efd0db5a000]
     java.lang.Thread.State: WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd4d09a620&gt; (a com.sun.enterprise.web.connector.grizzly.LinkedListPipeline)
      at java.lang.Object.wait(Object.java:485)
      at com.sun.enterprise.web.connector.grizzly.LinkedListPipeline.getTask(LinkedListPipeline.java:304)
      - locked &lt;0x00007efd4d09a620&gt; (a com.sun.enterprise.web.connector.grizzly.LinkedListPipeline)
      at com.sun.enterprise.web.connector.grizzly.WorkerThreadImpl.run(WorkerThreadImpl.java:120)
  
  
  "GrizzlyPipelineStatWorkerThread-4848-2" daemon prio=10 tid=0x00007efd20033000 nid=0x579 waiting on condition [0x00007efd10c8b000]
     java.lang.Thread.State: TIMED_WAITING (parking)
      at sun.misc.Unsafe.park(Native Method)
      - parking to wait for  &lt;0x00007efd4d098f30&gt; (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
      at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
      at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2025)
      at java.util.concurrent.DelayQueue.take(DelayQueue.java:164)
      at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:609)
      at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:602)
      at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
      at com.sun.enterprise.web.connector.grizzly.WorkerThreadImpl.run(WorkerThreadImpl.java:113)
  
  "GrizzlyPipelineStatWorkerThread-4848-1" daemon prio=10 tid=0x00007efd2124f000 nid=0x578 waiting on condition [0x00007efd10d8c000]
     java.lang.Thread.State: TIMED_WAITING (parking)
      at sun.misc.Unsafe.park(Native Method)
      - parking to wait for  &lt;0x00007efd4d098f30&gt; (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
      at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
      at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2025)
      at java.util.concurrent.DelayQueue.take(DelayQueue.java:164)
      at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:609)
      at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:602)
      at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
      at com.sun.enterprise.web.connector.grizzly.WorkerThreadImpl.run(WorkerThreadImpl.java:113)
  
  "httpSSLWorkerThread-8181-48" daemon prio=10 tid=0x0000000042041800 nid=0x575 in Object.wait() [0x00007efd1108f000]
     java.lang.Thread.State: WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd4d0c8308&gt; (a com.sun.enterprise.web.connector.grizzly.ssl.SSLPipeline)
      at java.lang.Object.wait(Object.java:485)
      at com.sun.enterprise.web.connector.grizzly.LinkedListPipeline.getTask(LinkedListPipeline.java:304)
      - locked &lt;0x00007efd4d0c8308&gt; (a com.sun.enterprise.web.connector.grizzly.ssl.SSLPipeline)
      at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:109)
  
  
  "SelectorThread-4848" prio=10 tid=0x00007efd207ba800 nid=0x546 runnable [0x00007efd13fbe000]
     java.lang.Thread.State: RUNNABLE
      at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
      at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
      at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
      at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
      - locked &lt;0x00007efd4d9c24c0&gt; (a sun.nio.ch.Util$1)
      - locked &lt;0x00007efd4d9c24a8&gt; (a java.util.Collections$UnmodifiableSet)
      - locked &lt;0x00007efd4d9c1d58&gt; (a sun.nio.ch.EPollSelectorImpl)
      at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
      at com.sun.enterprise.web.connector.grizzly.SelectorThread.doSelect(SelectorThread.java:1421)
      at com.sun.enterprise.web.connector.grizzly.SelectorThread.startListener(SelectorThread.java:1336)
      - locked &lt;0x00007efd4d9c27c0&gt; (a [Ljava.lang.Object;)
      at com.sun.enterprise.web.connector.grizzly.SelectorThread.startEndpoint(SelectorThread.java:1299)
      at com.sun.enterprise.web.connector.grizzly.SelectorThread.run(SelectorThread.java:1275)
  
  
  "httpSSLWorkerThread-8080-49" daemon prio=10 tid=0x00007efd20bfc800 nid=0x541 in Object.wait() [0x00007efd144c3000]
     java.lang.Thread.State: WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd4d0f97a8&gt; (a com.sun.enterprise.web.portunif.PortUnificationPipeline)
      at java.lang.Object.wait(Object.java:485)
      at com.sun.enterprise.web.connector.grizzly.LinkedListPipeline.getTask(LinkedListPipeline.java:304)
      - locked &lt;0x00007efd4d0f97a8&gt; (a com.sun.enterprise.web.portunif.PortUnificationPipeline)
      at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:109)
  
  
  "SelectorThread-8181" prio=10 tid=0x00007efd2161c000 nid=0x50e runnable [0x00007efd177f6000]
     java.lang.Thread.State: RUNNABLE
      at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
      at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
      at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
      at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
      - locked &lt;0x00007efd4d3a6800&gt; (a sun.nio.ch.Util$1)
      - locked &lt;0x00007efd4d3a67e8&gt; (a java.util.Collections$UnmodifiableSet)
      - locked &lt;0x00007efd4d3a6098&gt; (a sun.nio.ch.EPollSelectorImpl)
      at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
      at com.sun.enterprise.web.connector.grizzly.SelectorThread.doSelect(SelectorThread.java:1421)
      at com.sun.enterprise.web.connector.grizzly.SelectorThread.startListener(SelectorThread.java:1336)
      - locked &lt;0x00007efd4d3a6b00&gt; (a [Ljava.lang.Object;)
      at com.sun.enterprise.web.connector.grizzly.SelectorThread.startEndpoint(SelectorThread.java:1299)
      at com.sun.enterprise.web.connector.grizzly.SelectorThread.run(SelectorThread.java:1275)
  
  "GrizzlyPipelineStatWorkerThread-8080-1" daemon prio=10 tid=0x00007efd20f4c800 nid=0x50a waiting on condition [0x00007efd17bfa000]
     java.lang.Thread.State: TIMED_WAITING (parking)
      at sun.misc.Unsafe.park(Native Method)
      - parking to wait for  &lt;0x00007efd4d120680&gt; (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
      at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
      at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2025)
      at java.util.concurrent.DelayQueue.take(DelayQueue.java:164)
      at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:609)
      at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:602)
      at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
      at com.sun.enterprise.web.connector.grizzly.WorkerThreadImpl.run(WorkerThreadImpl.java:113)
  
  "GrizzlyPipelineStatWorkerThread-8080-0" daemon prio=10 tid=0x00007efd20966800 nid=0x509 waiting on condition [0x00007efd17cfb000]
     java.lang.Thread.State: TIMED_WAITING (parking)
      at sun.misc.Unsafe.park(Native Method)
      - parking to wait for  &lt;0x00007efd4d120680&gt; (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
      at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
      at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:2025)
      at java.util.concurrent.DelayQueue.take(DelayQueue.java:164)
      at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:609)
      at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:602)
      at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:947)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
      at com.sun.enterprise.web.connector.grizzly.WorkerThreadImpl.run(WorkerThreadImpl.java:113)
  
  "SelectorThread-8080" prio=10 tid=0x00007efd201a0800 nid=0x508 runnable [0x00007efd17dfc000]
     java.lang.Thread.State: RUNNABLE
      at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
      at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
      at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
      at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
      - locked &lt;0x00007efd4dc827a0&gt; (a sun.nio.ch.Util$1)
      - locked &lt;0x00007efd4dc82788&gt; (a java.util.Collections$UnmodifiableSet)
      - locked &lt;0x00007efd4dc82088&gt; (a sun.nio.ch.EPollSelectorImpl)
      at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
      at com.sun.enterprise.web.connector.grizzly.SelectorThread.doSelect(SelectorThread.java:1421)
      at com.sun.enterprise.web.connector.grizzly.SelectorThread.startListener(SelectorThread.java:1336)
      - locked &lt;0x00007efd4dc82aa0&gt; (a [Ljava.lang.Object;)
      at com.sun.enterprise.web.connector.grizzly.SelectorThread.startEndpoint(SelectorThread.java:1299)
      at com.sun.enterprise.web.connector.grizzly.SelectorThread.run(SelectorThread.java:1275)
  
  "ContainerBackgroundProcessor[StandardEngine[com.sun.appserv]]" daemon prio=10 tid=0x00007efd207af800 nid=0x503 waiting on condition [0x00007efd1c76c000]
     java.lang.Thread.State: TIMED_WAITING (sleeping)
      at java.lang.Thread.sleep(Native Method)
      at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1813)
      at java.lang.Thread.run(Thread.java:662)
  
  
  "Timer-13" daemon prio=10 tid=0x00007efd202d2800 nid=0x4fe in Object.wait() [0x00007efd1c96e000]
     java.lang.Thread.State: WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd4ab21998&gt; (a java.util.TaskQueue)
      at java.lang.Object.wait(Object.java:485)
      at java.util.TimerThread.mainLoop(Timer.java:483)
      - locked &lt;0x00007efd4ab21998&gt; (a java.util.TaskQueue)
      at java.util.TimerThread.run(Timer.java:462)
  
  "Timer-9" daemon prio=10 tid=0x00007efd209ad000 nid=0x4f9 in Object.wait() [0x00007efd1d7d1000]
     java.lang.Thread.State: TIMED_WAITING (on object monitor)
      at java.lang.Object.wait(Native Method)
      - waiting on &lt;0x00007efd4a82c750&gt; (a java.util.TaskQueue)
      at java.util.TimerThread.mainLoop(Timer.java:509)
      - locked &lt;0x00007efd4a82c750&gt; (a java.util.TaskQueue)
      at java.util.TimerThread.run(Timer.java:462)
  
  "Thread-11" daemon prio=10 tid=0x00007efd183f6800 nid=0x4c0 waiting on condition [0x00007efd1efe7000]
     java.lang.Thread.State: WAITING (parking)
      at sun.misc.Unsafe.park(Native Method)
      - parking to wait for  &lt;0x00007efd48273738&gt; (a java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
      at java.util.concurrent.locks.LockSupport.park(LockSupport.java:158)
      at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1987)
      at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:399)
      at com.sun.enterprise.management.support.LoaderRegThread.processFOREVER(LoaderRegThread.java:263)
      at com.sun.enterprise.management.support.LoaderRegThread.run(LoaderRegThread.java:311)
  
  
  "SelectorThread" daemon prio=10 tid=0x00007efd183ff800 nid=0x4ba runnable [0x00007efd1f5ed000]
     java.lang.Thread.State: RUNNABLE
      at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
      at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:210)
      at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:65)
      at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:69)
      - locked &lt;0x00007efd48171e70&gt; (a sun.nio.ch.Util$1)
      - locked &lt;0x00007efd48171e58&gt; (a java.util.Collections$UnmodifiableSet)
      - locked &lt;0x00007efd48171a98&gt; (a sun.nio.ch.EPollSelectorImpl)
      at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:80)
      at com.sun.corba.ee.impl.transport.SelectorImpl.run(SelectorImpl.java:283)
  </code></pre>
  
  <p>I'm looking for general information about interpreting the dump so that I can diagnose problems in the future. Thanks.</p>