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Posted to dev@activemq.apache.org by "Timothy Bish (JIRA)" <ji...@apache.org> on 2012/07/13 17:35:35 UTC
[jira] [Commented] (AMQ-3887) Occasional Null Pointer Exception
during NetworkConnector connection
[ https://issues.apache.org/jira/browse/AMQ-3887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13413822#comment-13413822 ]
Timothy Bish commented on AMQ-3887:
-----------------------------------
I'd recommend that you try and crate a JUnit test case to show how this is happening.
> Occasional Null Pointer Exception during NetworkConnector connection
> --------------------------------------------------------------------
>
> Key: AMQ-3887
> URL: https://issues.apache.org/jira/browse/AMQ-3887
> Project: ActiveMQ
> Issue Type: Bug
> Affects Versions: 5.6.0
> Environment: SLES 10
> Reporter: Ron Koerner
> Assignee: Timothy Bish
> Fix For: 5.7.0
>
>
> While starting a duplex NetworkConnector an NPE can be observed on the receiving side.
> {code}
> 2012-06-18 17:34:24,571 INFO .DemandForwardingBridgeSupport - Network connection between vm://proxy-cbpi001#8 and tcp:///169.254.
> 0.5:59412(cbox-56BU101117) has been established. [StartLocalBridge: localBroker=vm://proxy-cbpi001#8]
> 2012-06-18 17:34:24,577 WARN .DemandForwardingBridgeSupport - Caught an exception processing local command [BrokerService[proxy-c
> bpi001] Task-19]
> java.lang.NullPointerException: null
> at org.apache.activemq.network.DemandForwardingBridgeSupport.configureMessage(DemandForwardingBridgeSupport.java:644) ~[ac
> tivemq-core-5.6.0.jar:5.6.0]
> at org.apache.activemq.network.DemandForwardingBridgeSupport.serviceLocalCommand(DemandForwardingBridgeSupport.java:675) ~
> [activemq-core-5.6.0.jar:5.6.0]
> at org.apache.activemq.network.DemandForwardingBridgeSupport$1.onCommand(DemandForwardingBridgeSupport.java:139) [activemq
> -core-5.6.0.jar:5.6.0]
> at org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:116) [activemq-core-5.6.0.jar:5.6.0]
> at org.apache.activemq.transport.MutexTransport.onCommand(MutexTransport.java:50) [activemq-core-5.6.0.jar:5.6.0]
> at org.apache.activemq.transport.vm.VMTransport.doDispatch(VMTransport.java:135) [activemq-core-5.6.0.jar:5.6.0]
> at org.apache.activemq.transport.vm.VMTransport.dispatch(VMTransport.java:124) [activemq-core-5.6.0.jar:5.6.0]
> at org.apache.activemq.transport.vm.VMTransport.oneway(VMTransport.java:103) [activemq-core-5.6.0.jar:5.6.0]
> at org.apache.activemq.transport.MutexTransport.oneway(MutexTransport.java:68) [activemq-core-5.6.0.jar:5.6.0]
> at org.apache.activemq.transport.ResponseCorrelator.oneway(ResponseCorrelator.java:60) [activemq-core-5.6.0.jar:5.6.0]
> at org.apache.activemq.broker.TransportConnection.dispatch(TransportConnection.java:1307) [activemq-core-5.6.0.jar:5.6.0]
> at org.apache.activemq.broker.TransportConnection.processDispatch(TransportConnection.java:837) [activemq-core-5.6.0.jar:5
> .6.0]
> at org.apache.activemq.broker.TransportConnection.iterate(TransportConnection.java:872) [activemq-core-5.6.0.jar:5.6.0]
> at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:122) [activemq-core-5.6.0.jar:5.6.0]
> at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:43) [activemq-core-5.6.0.jar:5.6.0]
> at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) [na:1.6.0_20]
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.6.0_20]
> at java.lang.Thread.run(Unknown Source) [na:1.6.0_20]
> {code}
> The other broker will eventually connect, but with about a hundred of connecting brokers this occurs too often to ignore.
> As this seems to be a race condition it is quite difficult to reproduce reliably. I assume producerInfo is accessed in configureMessage before it is initialized in startRemoteBridge.
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