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https://issues.apache.org/jira/browse/ARTEMIS-1949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Justin Bertram resolved ARTEMIS-1949.
-------------------------------------
       Resolution: Fixed
    Fix Version/s: 2.7.0

> fix IllegalMonitorStateException during shutdown
> ------------------------------------------------
>
>                 Key: ARTEMIS-1949
>                 URL: https://issues.apache.org/jira/browse/ARTEMIS-1949
>             Project: ActiveMQ Artemis
>          Issue Type: Bug
>          Components: Broker
>            Reporter: yangwei
>            Priority: Minor
>             Fix For: 2.7.0
>
>
> During server shutdown, the exception occurs as follows:
> 2018-06-19 16:23:03,503 WARN [org.apache.activemq.artemis.core.client] 
> AMQ212063: Unable to handle connection failure : 
> java.lang.IllegalMonitorStateException
>  at 
> java.util.concurrent.locks.ReentrantLock$Sync.tryRelease(ReentrantLock.java:151)
>  [rt.jar:1.8.0_92]
>  at 
> java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1261)
>  [rt.jar:1.8.0_92]
>  at java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:457) 
> [rt.jar:1.8.0_92]
>  at 
> org.apache.activemq.artemis.core.protocol.core.impl.ActiveMQClientProtocolManager.cleanupBeforeFailover(ActiveMQClientProtocolManager.java:373)
>  [artemis-core-client-2.4.0.jar:2.4.0]
>  at 
> org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl.failoverOrReconnect(ClientSessionFactoryImpl.java:588)
>  [artemis-core-client-2.4.0.jar:2.4.0]
>  at 
> org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl.handleConnectionFailure(ClientSessionFactoryImpl.java:504)
>  [artemis-core-client-2.4.0.jar:2.4.0]
>  at 
> org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl.handleConnectionFailure(ClientSessionFactoryImpl.java:497)
>  [artemis-core-client-2.4.0.jar:2.4.0]
>  at 
> org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl.access$100(ClientSessionFactoryImpl.java:72)
>  [artemis-core-client-2.4.0.jar:2.4.0]
>  at 
> org.apache.activemq.artemis.core.client.impl.ClientSessionFactoryImpl$1.run(ClientSessionFactoryImpl.java:360)
>  [artemis-core-client-2.4.0.jar:2.4.0]
>  at 
> org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:42)
>  [artemis-commons-2.4.0.jar:2.4.0]
>  at 
> org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:31)
>  [artemis-commons-2.4.0.jar:2.4.0]
>  at 
> org.apache.activemq.artemis.utils.actors.ProcessorBase$ExecutorTask.run(ProcessorBase.java:53)
>  [artemis-commons-2.4.0.jar:2.4.0]
>  at 
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
>  [rt.jar:1.8.0_92]
>  at 
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
>  [rt.jar:1.8.0_92]
>  at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_92]
> To fix this, we return null if clientProtocolManager is not alive in 
> lockSessionCreation().



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