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https://issues.apache.org/jira/browse/AMQ-3276?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13017640#comment-13017640
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Daniel Kulp commented on AMQ-3276:
----------------------------------
Just a note that while testing CXF with 5.5.0, I also run into this
occasionally. The CXF test suite will need to remain on 5.4.2 for now.
> ConcurrentModificationException in embedded 5.5.0 broker
> --------------------------------------------------------
>
> Key: AMQ-3276
> URL: https://issues.apache.org/jira/browse/AMQ-3276
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.5.0
> Environment: jdk 1.6.0_24, Spring 3.0.5, ActiveMQ 5.5.0, Camel 2.7.0,
> slf4j 1.6.1
> Reporter: Dan Checkoway
> Assignee: Gary Tully
> Fix For: 5.6.0
>
>
> We just migrated from ActiveMQ 5.4.2 to ActiveMQ 5.5.0. So far so good, with
> one exception (pun not intended). In one case where we have an embedded
> broker, we're seeing this exception get logged on occasion:
> WARNING; 08-Apr-2011 11:11:41; tid:45931; TransportConnection stopAsync;
> cannot create async transport stopper thread.. not waiting for stop to
> complete, reason:
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$EntryIterator.next(HashMap.java:834)
> at java.util.HashMap$EntryIterator.next(HashMap.java:832)
> at java.util.HashMap.putAllForCreate(HashMap.java:435)
> at java.util.HashMap.<init>(HashMap.java:225)
> at
> org.slf4j.helpers.BasicMDCAdapter.getCopyOfContextMap(BasicMDCAdapter.java:130)
> at org.slf4j.MDC.getCopyOfContextMap(MDC.java:182)
> at
> org.apache.activemq.util.MDCHelper.getCopyOfContextMap(MDCHelper.java:30)
> at
> org.apache.activemq.broker.TransportConnection.stopAsync(TransportConnection.java:946)
> at
> org.apache.activemq.broker.TransportConnection.processShutdown(TransportConnection.java:353)
> at
> org.apache.activemq.command.ShutdownInfo.visit(ShutdownInfo.java:35)
> at
> org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:306)
> at
> org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:179)
> at
> org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:116)
> at
> org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:69)
> at
> org.apache.activemq.transport.vm.VMTransport.iterate(VMTransport.java:218)
> at
> org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:127)
> at
> org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:48)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> Up until this morning, I had only seen that logged during shutdown of the app
> context. But just now, it popped out independently, out of the blue.
> For what it's worth, here's the app context config:
>
> <broker xmlns="http://activemq.apache.org/schema/core";
> id="embeddedActivemqBroker"
> useJmx="true"
> persistent="true"
> schedulerSupport="false"
> advisorySupport="false"
> enableStatistics="true">
> <destinationPolicy>
> <policyMap>
> <policyEntries>
> <policyEntry queue=">" producerFlowControl="false"
> memoryLimit="20mb"/>
> </policyEntries>
> </policyMap>
> </destinationPolicy>
> <persistenceAdapter>
> <kahaDB directory="${EmbeddedBroker.dataDirectory}"
> concurrentStoreAndDispatchQueues="false"/>
> </persistenceAdapter>
> </broker>
> Has anybody else seen this ConcurrentModificationException happening with
> 5.5.0 (or otherwise)? Any ideas?
> I suppose I should also mention that we're using slf4j 1.6.1. Not sure if
> that has anything to do with this, since the stack trace does show it
> happening in slf4j land...
> <dependency>
> <groupId>org.slf4j</groupId>
> <artifactId>slf4j-api</artifactId>
> <version>1.6.1</version>
> <scope>runtime</scope>
> </dependency>
> <dependency>
> <groupId>org.slf4j</groupId>
> <artifactId>slf4j-jdk14</artifactId>
> <version>1.6.1</version>
> <scope>runtime</scope>
> </dependency>
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