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From Robbie Gemmell <robbie.gemm...@gmail.com>
Subject Re: Qpid JMS client JmsConnection.close() hangs
Date Fri, 25 Nov 2016 15:42:35 GMT
Yes that looks like its trying to get a lock which the onMessage
handler is holding while firing, which is ongoing due to a send within
it.

On 25 November 2016 at 07:37, DraCzech <draczech@gmail.com> wrote:
> When going through logs I also found this piece of thread dump. Which shows
> that my cleaning thread is waiting for a lock held by ActiveMQ thread. A
> state which is definitely not desired, but I'm not sure if can be prevented
> completely...
>
> 2016-11-24 17:46:10.016523  "JMS Connector cleaner" daemon prio=10
> tid=0x0005bf70 nid=0x9d7 waiting for monitor entry [0x555bb000]
> 2016-11-24 17:46:10.016829     java.lang.Thread.State: BLOCKED (on object
> monitor)
> 2016-11-24 17:46:10.017286      at
> org.apache.activemq.FifoMessageDispatchChannel.stop(FifoMessageDispatchChannel.java:124)
> 2016-11-24 17:46:10.018599      - waiting to lock <0x489bcd68> (a
> java.lang.Object)
> 2016-11-24 17:46:10.018996      at
> org.apache.activemq.ActiveMQMessageConsumer.stop(ActiveMQMessageConsumer.java:1551)
> 2016-11-24 17:46:10.019423      at
> org.apache.activemq.ActiveMQSession.stop(ActiveMQSession.java:1856)
> 2016-11-24 17:46:10.019942      at
> org.apache.activemq.ActiveMQConnection.doStop(ActiveMQConnection.java:586)
> 2016-11-24 17:46:10.020338      - locked <0x4832e608> (a
> java.util.concurrent.CopyOnWriteArrayList)
> 2016-11-24 17:46:10.020827      at
> org.apache.activemq.ActiveMQConnection.close(ActiveMQConnection.java:642)
> 2016-11-24 17:46:10.021193      at
> org.apache.activemq.network.jms.JmsConnector.stop(JmsConnector.java:186)
> 2016-11-24 17:46:10.022109      at
> com.openmatics.box.iotdatabroker.internal.connection.ServerConnector$JMSConnectorCleaner.run(ServerConnector.java:645)
> 2016-11-24 17:46:10.022536      at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> 2016-11-24 17:46:10.023024      at
> java.util.concurrent.FutureTask.run(FutureTask.java:262)
> 2016-11-24 17:46:10.024306      at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 2016-11-24 17:46:10.024764      at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 2016-11-24 17:46:10.025313      at java.lang.Thread.run(Thread.java:745)
> 2016-11-24 17:46:10.038101  "ActiveMQ Session Task-17" prio=10
> tid=0x00271920 nid=0x995 waiting on condition [0x56072000]
> 2016-11-24 17:46:10.038681     java.lang.Thread.State: WAITING (parking)
> 2016-11-24 17:46:10.039749      at sun.misc.Unsafe.park(Native Method)
> 2016-11-24 17:46:10.040024      - parking to wait for  <0x44080548> (a
> java.util.concurrent.CountDownLatch$Sync)
> 2016-11-24 17:46:10.040238      at
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> 2016-11-24 17:46:10.040421      at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
> 2016-11-24 17:46:10.040756      at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994)
> 2016-11-24 17:46:10.040970      at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303)
> 2016-11-24 17:46:10.043106      at
> java.util.concurrent.CountDownLatch.await(CountDownLatch.java:236)
> 2016-11-24 17:46:10.043351      at
> org.apache.qpid.jms.provider.ProviderFuture.sync(ProviderFuture.java:97)
> 2016-11-24 17:46:10.043625      at
> org.apache.qpid.jms.JmsConnection.send(JmsConnection.java:630)
> 2016-11-24 17:46:10.043839      at
> org.apache.qpid.jms.JmsConnection.send(JmsConnection.java:619)
> 2016-11-24 17:46:10.044144      at
> org.apache.qpid.jms.JmsNoTxTransactionContext.send(JmsNoTxTransactionContext.java:37)
> 2016-11-24 17:46:10.044358      at
> org.apache.qpid.jms.JmsSession.send(JmsSession.java:717)
> 2016-11-24 17:46:10.044571      at
> org.apache.qpid.jms.JmsSession.send(JmsSession.java:634)
> 2016-11-24 17:46:10.044785      at
> org.apache.qpid.jms.JmsMessageProducer.sendMessage(JmsMessageProducer.java:185)
> 2016-11-24 17:46:10.045121      at
> org.apache.qpid.jms.JmsMessageProducer.send(JmsMessageProducer.java:177)
> 2016-11-24 17:46:10.045365      at
> org.apache.qpid.jms.JmsMessageProducer.send(JmsMessageProducer.java:166)
> 2016-11-24 17:46:10.045609      at
> org.apache.qpid.jms.JmsQueueSender.send(JmsQueueSender.java:50)
> 2016-11-24 17:46:10.046403      at
> org.apache.activemq.network.jms.QueueBridge.sendMessage(QueueBridge.java:83)
> 2016-11-24 17:46:10.048692      - locked <0x48366908> (a
> org.apache.activemq.network.jms.OutboundQueueBridge)
> 2016-11-24 17:46:10.048936      at
> org.apache.activemq.network.jms.DestinationBridge.onMessage(DestinationBridge.java:135)
> 2016-11-24 17:46:10.049149      at
> org.apache.activemq.ActiveMQMessageConsumer.dispatch(ActiveMQMessageConsumer.java:1401)
> 2016-11-24 17:46:10.049363      - locked <0x489bcd68> (a java.lang.Object)
> 2016-11-24 17:46:10.049668      at
> org.apache.activemq.ActiveMQSessionExecutor.dispatch(ActiveMQSessionExecutor.java:131)
> 2016-11-24 17:46:10.049882      at
> org.apache.activemq.ActiveMQSessionExecutor.iterate(ActiveMQSessionExecutor.java:202)
> 2016-11-24 17:46:10.050126      at
> org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:133)
> 2016-11-24 17:46:10.050340      at
> org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:48)
> 2016-11-24 17:46:10.050553      at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 2016-11-24 17:46:10.050859      at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 2016-11-24 17:46:10.051988      at java.lang.Thread.run(Thread.java:745)
>
>
>
> --
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