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From "Ben O'Day (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (AMQ-4092) ConcurrentModificationException when using message groups
Date Thu, 04 Oct 2012 15:31:47 GMT

    [ https://issues.apache.org/jira/browse/AMQ-4092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13469457#comment-13469457
] 

Ben O'Day commented on AMQ-4092:
--------------------------------

thanks Gary, testing with concurrentStoreAndDispatchQueues=false now...so far so good
                
> ConcurrentModificationException when using message groups
> ---------------------------------------------------------
>
>                 Key: AMQ-4092
>                 URL: https://issues.apache.org/jira/browse/AMQ-4092
>             Project: ActiveMQ
>          Issue Type: Bug
>    Affects Versions: 5.6.0
>         Environment: ActiveMQ 5.6.0 standalone, kahadb persistence, Spring JMSTemplate
producer (ObjectMessage), Camel 2.9.2 route consumer (AMQ connection pool, vm transport)
>            Reporter: Ben O'Day
>
> seeing these WARN messages frequently while consuming (maxConcurrentConsumers=5) from
a queue with the message groups header (JMSXGroupID) set.  If I disable the message groups
header, these errors go away...  
> That said, I don't see any specific errors with my application (at this point), just
these messages in my logs.
> 2012-10-04 02:34:02,552 |  WARN - Service              - | 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:785)
> 	at org.apache.activemq.broker.region.Queue.send(Queue.java:707)
> 	at org.apache.activemq.broker.region.AbstractRegion.send(AbstractRegion.java:407)
> 	at org.apache.activemq.broker.region.RegionBroker.send(RegionBroker.java:503)
> 	at org.apache.activemq.broker.jmx.ManagedRegionBroker.send(ManagedRegionBroker.java:305)
> 	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:306)
> 	at org.apache.activemq.broker.MutableBrokerFilter.send(MutableBrokerFilter.java:135)
> 	at org.apache.activemq.broker.TransportConnection.processMessage(TransportConnection.java:453)
> 	at org.apache.activemq.command.ActiveMQMessage.visit(ActiveMQMessage.java:681)
> 	at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:292)
> 	at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:150)
> 	at org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:116)
> 	at org.apache.activemq.transport.MutexTransport.onCommand(MutexTransport.java:50)
> 	at org.apache.activemq.transport.vm.VMTransport.iterate(VMTransport.java:231)
> 	at org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:122)
> 	at org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:43)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> 	at java.lang.Thread.run(Thread.java:680)
> Caused by: java.util.ConcurrentModificationException
> 	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> 	at java.util.HashMap$KeyIterator.next(HashMap.java:828)
> 	at org.apache.activemq.util.MarshallingSupport.marshalPrimitiveMap(MarshallingSupport.java:64)
> 	at org.apache.activemq.command.Message.beforeMarshall(Message.java:210)
> 	at org.apache.activemq.command.ActiveMQObjectMessage.beforeMarshall(ActiveMQObjectMessage.java:199)
> 	at org.apache.activemq.openwire.v6.MessageMarshaller.looseMarshal(MessageMarshaller.java:277)
> 	at org.apache.activemq.openwire.v6.ActiveMQMessageMarshaller.looseMarshal(ActiveMQMessageMarshaller.java:111)
> 	at org.apache.activemq.openwire.v6.ActiveMQObjectMessageMarshaller.looseMarshal(ActiveMQObjectMessageMarshaller.java:111)
> 	at org.apache.activemq.openwire.OpenWireFormat.marshal(OpenWireFormat.java:168)
> 	at org.apache.activemq.store.kahadb.KahaDBStore$KahaDBMessageStore.addMessage(KahaDBStore.java:429)
> 	at org.apache.activemq.store.kahadb.KahaDBStore$StoreQueueTask.run(KahaDBStore.java:1177)
> 	... 3 more

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