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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> -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira