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From boday <ben.o...@initekconsulting.com>
Subject ActiveMQ message groups ConcurrentModificationException
Date Fri, 28 Sep 2012 19:35:38 GMT
I'm using AMQ message groups with AMQ 5.5.0-fuse-00-27 with Kahadb persistent
messaging and periodically see this WARN in the logs. I don't see any
specific errors that result from this, but am wondering what the side
effects of this are, etc.

My consumer is a Camel (2.7.1-fuse-00-27) route with
maxConcurrentConsumers=5 (using AMQ connection pool, etc). I'll try to boil
this down to a unit test at some point...for now, here is the stack trace

(NOTE: posted on SFO as well...no action there yet, so I tried here instead)

http://stackoverflow.com/questions/12644272/activemq-message-groups-concurrentmodificationexception

2012-09-28 16:39:04,497 |  WARN | TransportConnection.java | Async error
occurred: java.util.concurrent.ExecutionException:
java.util.ConcurrentModificationException
java.util.concurrent.ExecutionException:
java.util.ConcurrentModificationException
    at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
    at java.util.concurrent.FutureTask.get(FutureTask.java:83)
    at org.apache.activemq.broker.region.Queue.doMessageSend(Queue.java:730)
    at org.apache.activemq.broker.region.Queue.send(Queue.java:652)
    at
org.apache.activemq.broker.region.AbstractRegion.send(AbstractRegion.java:379)
    at
org.apache.activemq.broker.region.RegionBroker.send(RegionBroker.java:523)
    at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129)
    at
org.apache.activemq.broker.CompositeDestinationBroker.send(CompositeDestinationBroker.java:96)
    at
org.apache.activemq.broker.TransactionBroker.send(TransactionBroker.java:304)
    at
org.apache.activemq.broker.MutableBrokerFilter.send(MutableBrokerFilter.java:135)
    at
org.apache.activemq.broker.TransportConnection.processMessage(TransportConnection.java:468)
    at
org.apache.activemq.command.ActiveMQMessage.visit(ActiveMQMessage.java:681)
    at
org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:316)
    at
org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:180)
    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.DedicatedTaskRunner.runTask(DedicatedTaskRunner.java:98)
    at
org.apache.activemq.thread.DedicatedTaskRunner$1.run(DedicatedTaskRunner.java:36)
Caused by: java.util.ConcurrentModificationException
    at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
    at java.util.HashMap$KeyIterator.next(HashMap.java:828)
    at
org.apache.activemq.util.MarshallingSupport.marshalPrimitiveMap(MarshallingSupport.java:64)
    at org.apache.activemq.command.Message.beforeMarshall(Message.java:210)
    at
org.apache.activemq.command.ActiveMQObjectMessage.beforeMarshall(ActiveMQObjectMessage.java:199)
    at
org.apache.activemq.openwire.v6.MessageMarshaller.looseMarshal(MessageMarshaller.java:277)
    at
org.apache.activemq.openwire.v6.ActiveMQMessageMarshaller.looseMarshal(ActiveMQMessageMarshaller.java:111)
    at
org.apache.activemq.openwire.v6.ActiveMQObjectMessageMarshaller.looseMarshal(ActiveMQObjectMessageMarshaller.java:111)
    at
org.apache.activemq.openwire.OpenWireFormat.marshal(OpenWireFormat.java:167)
    at
org.apache.activemq.store.kahadb.KahaDBStore$KahaDBMessageStore.addMessage(KahaDBStore.java:357)
    at
org.apache.activemq.store.kahadb.KahaDBStore$StoreQueueTask.run(KahaDBStore.java:1102)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:680)



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