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https://issues.apache.org/jira/browse/AMQ-4092?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13727342#comment-13727342
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Amol Verma edited comment on AMQ-4092 at 8/2/13 5:18 AM:
---------------------------------------------------------
Hi,
i am not an expert using Activemq..but i am facing the same issue. Gary Tully
can you please suggest where to add, i.e. under which section, the fix code
i.e. "concurrentStoreAndDispatchQueues=false" in activemq.xml? or please
provide sample activemq.xml file with this workaround.
Thanks,
amol
was (Author: the_amol):
Hi,
i am not an expert using Activemq..but i am facing the same issue. Gary Tully
can you please suggest where to add the fix code i.e.
"concurrentStoreAndDispatchQueues=false" in activemq.xml?
Thanks,
amol
> 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
> Fix For: 5.9.0
>
>
> 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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