Philip Harvey created QPID-4121:
-----------------------------------

             Summary: 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
            Reporter: Philip Harvey
            Assignee: Philip Harvey
             Fix For: Future


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$VirtualHostHouseKeepingTask 
(VirtualHostImpl.java:407) - Exc
eption in housekeeping for connection: 
/169.115.203.31:50639(emea_uk_dcpp_notifier_ds)
        java.util.ConcurrentModificationException
        at 
java.util.AbstractList$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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