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https://issues.apache.org/activemq/browse/AMQ-2918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=61842#action_61842
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Gary Tully commented on AMQ-2918:
---------------------------------
can you provide your test case or some code or xml configuration that can
reproduce?
> ActiveMQMapMessage stay in memory causing leaks
> -----------------------------------------------
>
> Key: AMQ-2918
> URL: https://issues.apache.org/activemq/browse/AMQ-2918
> Project: ActiveMQ
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.4.0
> Environment: Windows XP
> Reporter: ashwini kuntamukkala
>
> I am running embedded broker in a spring container. During a volume test, I
> forward messages to a dead letter queue. ActiveMQMapMessage that are being
> redirected to dead letter queue stay in memory. So, if I forward 15000
> messages to dead letter queue, all 15000 messages will be in memory. These
> are persistent messages.
> I want to have a smaller memory footprint. Why are the activemqmapmessages
> staying in memory. the ones that were successfully processed get deleted just
> fine.
> This is jmap -histo output
> 14: 19826 3647984
> org.apache.activemq.command.ActiveMQMapMessage
> 28: 19791 791640 org.apache.activemq.command.ActiveMQQueue
> total of 19K+ activeMqMapMessages and ActiveMQQueue instances...
> Since these are dead letter messages, why does ActiveMQ need to hold
> references to these messages in memory??
> ----------------------------------
> I tried using the filequeuecursor: after a while the broker stopped
> responding because of the following error.
> org.apache.activemq.broker.TransportConnection.Service.serviceException() 294
> : Async error occurred: java.lang.RuntimeException:
> java.lang.NullPointerException
> java.lang.RuntimeException: java.lang.NullPointerException
> at
> org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.tryAddMessageLast(FilePendingMessageCursor.java:228)
> at
> org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.addMessageLast(FilePendingMessageCursor.java:192)
> at org.apache.activemq.broker.region.Queue.sendMessage(Queue.java:1601)
> at org.apache.activemq.broker.region.Queue.doMessageSend(Queue.java:707)
> at org.apache.activemq.broker.region.Queue.send(Queue.java:646)
> at
> org.apache.activemq.broker.region.AbstractRegion.send(AbstractRegion.java:365)
> at
> org.apache.activemq.broker.region.RegionBroker.send(RegionBroker.java:494)
> at org.apache.activemq.broker.BrokerFilter.send(BrokerFilter.java:129)
> at
> org.apache.activemq.broker.scheduler.SchedulerBroker.send(SchedulerBroker.java:136)
> 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:230)
> at
> org.apache.activemq.broker.MutableBrokerFilter.send(MutableBrokerFilter.java:135)
> at
> org.apache.activemq.broker.TransportConnection.processMessage(TransportConnection.java:460)
> at
> org.apache.activemq.command.ActiveMQMessage.visit(ActiveMQMessage.java:663)
> at
> org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:309)
> at
> org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:185)
> 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:122)
> at
> org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:43)
> at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown
> Source)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
> at java.lang.Thread.run(Unknown Source)
> Caused by: java.lang.NullPointerException
> at org.apache.activemq.store.kahadb.plist.PList.addLast(PList.java:176)
> at
> org.apache.activemq.store.kahadb.plist.PList$2.execute(PList.java:163)
> at org.apache.kahadb.page.Transaction.execute(Transaction.java:728)
> at org.apache.activemq.store.kahadb.plist.PList.addLast(PList.java:161)
> at
> org.apache.activemq.broker.region.cursors.FilePendingMessageCursor.tryAddMessageLast(FilePendingMessageCursor.java:221)
> ... 24 more
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