Ben O'Day created AMQ-4092:
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Summary: 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 using consuming
(maxConcurrentConsumers=5) from a queue with the message groups header
(JMSXGroupID) set. If I disable the message groups, these 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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