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https://issues.apache.org/activemq/browse/AMQ-1930?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=45546#action_45546
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Scott Stanton commented on AMQ-1930:
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Not really. It happens occasionally during our automated testing when
we shut down our server, but I haven't been able to force it to happen
on command. I didn't see anything of note in the log prior to the
failure that would give any clues to the problem. If you have a
suggestion for logging statements to add, I'd be happy to put them into
our system and see if we can collect some more details.
> NPE during shutdown of embedded activemq
> ----------------------------------------
>
> Key: AMQ-1930
> URL: https://issues.apache.org/activemq/browse/AMQ-1930
> Project: ActiveMQ
> Issue Type: Bug
> Components: Transport
> Affects Versions: 5.2.0
> Environment: revision 675393 of trunk, ActiveMQ 5.2.0
> Reporter: Scott Stanton
>
> I received the following exception from the VMTransport thread when shutting
> down the broker:
> {code}
> Async error occurred: java.lang.NullPointerException
> java.lang.NullPointerException
> at
> org.apache.activemq.broker.TransportConnection.processRemoveConsumer(TransportConnection.java:542)
> at org.apache.activemq.command.RemoveInfo.visit(RemoveInfo.java:64)
> at
> org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:292)
> at
> org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:180)
> at
> org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:104)
> at
> org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:68)
> at
> org.apache.activemq.transport.vm.VMTransport.iterate(VMTransport.java:205)
> at
> org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:122)
> at
> org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:43)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
> at java.lang.Thread.run(Thread.java:619)
> {code}
> The failure occurred at the following lines of code:
> {code}
> TransportConnectionState cs = lookupConnectionState(connectionId);
> SessionState ss = cs.getSessionState(sessionId);
> {code}
> It appears that there is a race during shutdown where the connection state is
> discarded before the last consumer is removed.
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