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https://issues.apache.org/jira/browse/QPID-4121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13416695#comment-13416695
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Justin Ross commented on QPID-4121:
-----------------------------------
Reviewed by Keith. Approved for 0.18.
> ConcurrentModificationException reported by HouseKeepingTask while closing
> session
> ----------------------------------------------------------------------------------
>
> Key: QPID-4121
> URL: https://issues.apache.org/jira/browse/QPID-4121
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: 0.16, 0.17, 0.18
> Reporter: Philip Harvey
> Assignee: Keith Wall
> Fix For: 0.19
>
> Attachments:
> 0001-QPID-4121-AMQProtocolEngine-now-uses-lock-to-prevent.patch
>
>
> A ConcurrentModificationException was reported by a housekeeping thread while
> closing a session. It was closing the session because its transaction was
> open or idle for longer than the configured maximum time.
> Here is the log excerpt:
> {noformat}
> 2012-07-02 19:25:12,210 WARN [notifier:VirtualHostHouseKeepingTask]
> server.AMQChannel (AMQChannel.java:1519) - IDLE TRANSACTION ALERT
> org.apache.qpid.server
> .logging.subjects.ChannelLogSubject@4ca3b645 503084 ms
> 2012-07-02 23:48:41,979 WARN [notifier:VirtualHostHouseKeepingTask]
> server.AMQChannel (AMQChannel.java:1519) - IDLE TRANSACTION ALERT
> org.apache.qpid.server
> .logging.subjects.ChannelLogSubject@3b1d0a16 584211 ms
> 2012-07-02 23:48:42,033 ERROR [notifier:VirtualHostHouseKeepingTask]
> virtualhost.VirtualHostImpl$VirtualHostHouseKeepingTask
> (VirtualHostImpl.java:407) - Exception in housekeeping for connection:
> /xxx.xxx.xxx.xx:50639(xxxxx)
> java.util.ConcurrentModificationException
> at
> java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)
> at java.util.AbstractList$Itr.next(AbstractList.java:343)
> at
> org.apache.qpid.server.txn.LocalTransaction.rollback(LocalTransaction.java:297)
> at org.apache.qpid.server.AMQChannel.close(AMQChannel.java:535)
> at
> org.apache.qpid.server.protocol.AMQProtocolEngine.closeChannel(AMQProtocolEngine.java:727)
> at
> org.apache.qpid.server.protocol.AMQProtocolEngine.closeSession(AMQProtocolEngine.java:1350)
> at
> org.apache.qpid.server.AMQChannel.checkTransactionStatus(AMQChannel.java:1530)
> at
> org.apache.qpid.server.virtualhost.VirtualHostImpl$VirtualHostHouseKeepingTask.execute(VirtualHostImpl.java:400)
> at
> org.apache.qpid.server.virtualhost.HouseKeepingTask.run(HouseKeepingTask.java:61)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> at
> java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:317)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:150)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101
> (ScheduledThreadPoolExecutor.java:98)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic
> (ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:204)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
> {noformat}
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