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From "Dan Checkoway (JIRA)" <j...@apache.org>
Subject [jira] [Created] (AMQ-3276) ConcurrentModificationException in embedded 5.5.0 broker
Date Fri, 08 Apr 2011 13:49:05 GMT
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


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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