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Posted to dev@qpid.apache.org by "Robbie Gemmell (JIRA)" <qp...@incubator.apache.org> on 2010/03/04 15:31:27 UTC

[jira] Created: (QPID-2430) Java broker emits NPE a period following qpid-tool being connected

Java broker emits NPE a period following qpid-tool being connected
------------------------------------------------------------------

                 Key: QPID-2430
                 URL: https://issues.apache.org/jira/browse/QPID-2430
             Project: Qpid
          Issue Type: Bug
          Components: Java Broker, Java Management : QMF
    Affects Versions: 0.7
            Reporter: Robbie Gemmell
             Fix For: 0.7


Whilst qpid-tool is connected to the Java broker, after a period of time the broker is seen to emit a NullPointerException. This was typically seen quickyl before the management update period was increased to 10 seconds, now it occurs after a longer period, suggesting the root cause is dependant on the number of messages sent. Thus far, the same code location has generated the NPE when called from slightly different contexts in the following 3 threads:

Exception in thread "TimerThread-test:" java.lang.NullPointerException
Exception in thread "pool-1-thread-X" java.lang.NullPointerException
Exception in thread "SubFlushRunner-org.apache.qpid.server.subscription.Subscription_0_10@1d4d493" java.lang.NullPointerException


Up to date stack (r918944):
Exception in thread "TimerThread-test:" java.lang.NullPointerException
        at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
        at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:577)
        at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:564)
        at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:696)
        at org.apache.qpid.server.queue.SimpleAMQQueue.deliverToSubscription(SimpleAMQQueue.java:641)
        at org.apache.qpid.server.queue.SimpleAMQQueue.enqueue(SimpleAMQQueue.java:594)
        at org.apache.qpid.server.queue.SimpleAMQQueue.enqueue(SimpleAMQQueue.java:519)
        at org.apache.qpid.qmf.ManagementExchange.publishToConsole(ManagementExchange.java:364)
        at org.apache.qpid.qmf.ManagementExchange.publishObjectsToConsole(ManagementExchange.java:343)
        at org.apache.qpid.qmf.ManagementExchange.publishAllConsole(ManagementExchange.java:316)
        at org.apache.qpid.qmf.ManagementExchange$UpdateTask.run(ManagementExchange.java:497)
        at java.util.TimerThread.mainLoop(Timer.java:512)
        at java.util.TimerThread.run(Timer.java:462)

Older stacks (some line numbers have changed slightly since):
Exception in thread "SubFlushRunner-org.apache.qpid.server.subscription.Subscription_0_10@1d4d493" java.lang.NullPointerException
        at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
        at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:576)
        at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:563)
        at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:674)
        at org.apache.qpid.server.queue.SimpleAMQQueue.attemptDelivery(SimpleAMQQueue.java:1646)
        at org.apache.qpid.server.queue.SimpleAMQQueue.flushSubscription(SimpleAMQQueue.java:1585)
        at org.apache.qpid.server.queue.SubFlushRunner.run(SubFlushRunner.java:56)
        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:619)
Exception in thread "SubFlushRunner-org.apache.qpid.server.subscription.Subscription_0_10@1d4d493" java.lang.NullPointerException
        at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
        at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:576)
        at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:563)
        at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:674)
        at org.apache.qpid.server.queue.SimpleAMQQueue.attemptDelivery(SimpleAMQQueue.java:1646)
        at org.apache.qpid.server.queue.SimpleAMQQueue.flushSubscription(SimpleAMQQueue.java:1585)
        at org.apache.qpid.server.queue.SubFlushRunner.run(SubFlushRunner.java:56)
        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:619)
Exception in thread "pool-1-thread-15" java.lang.NullPointerException
        at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
        at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:576)
        at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:563)
        at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:674)
        at org.apache.qpid.server.queue.SimpleAMQQueue.attemptDelivery(SimpleAMQQueue.java:1646)
        at org.apache.qpid.server.queue.SimpleAMQQueue.processQueue(SimpleAMQQueue.java:1765)
        at org.apache.qpid.server.queue.SimpleAMQQueue.access$100(SimpleAMQQueue.java:70)
        at org.apache.qpid.server.queue.SimpleAMQQueue$Runner.run(SimpleAMQQueue.java:1542)
        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:619)

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[jira] Updated: (QPID-2430) Java broker emits NPE following qpid-tool being connected

Posted by "Robbie Gemmell (JIRA)" <qp...@incubator.apache.org>.
     [ https://issues.apache.org/jira/browse/QPID-2430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robbie Gemmell updated QPID-2430:
---------------------------------

    Summary: Java broker emits NPE following qpid-tool being connected  (was: Java broker emits NPE a period following qpid-tool being connected)

> Java broker emits NPE following qpid-tool being connected
> ---------------------------------------------------------
>
>                 Key: QPID-2430
>                 URL: https://issues.apache.org/jira/browse/QPID-2430
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Broker, Java Management : QMF
>    Affects Versions: 0.7
>            Reporter: Robbie Gemmell
>             Fix For: 0.7
>
>
> Whilst qpid-tool is connected to the Java broker, after a period of time the broker is seen to emit a NullPointerException. This was typically seen quickyl before the management update period was increased to 10 seconds, now it occurs after a longer period, suggesting the root cause is dependant on the number of messages sent. Thus far, the same code location has generated the NPE when called from slightly different contexts in the following 3 threads:
> Exception in thread "TimerThread-test:" java.lang.NullPointerException
> Exception in thread "pool-1-thread-X" java.lang.NullPointerException
> Exception in thread "SubFlushRunner-org.apache.qpid.server.subscription.Subscription_0_10@1d4d493" java.lang.NullPointerException
> Up to date stack (r918944):
> Exception in thread "TimerThread-test:" java.lang.NullPointerException
>         at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
>         at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:577)
>         at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:564)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:696)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverToSubscription(SimpleAMQQueue.java:641)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.enqueue(SimpleAMQQueue.java:594)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.enqueue(SimpleAMQQueue.java:519)
>         at org.apache.qpid.qmf.ManagementExchange.publishToConsole(ManagementExchange.java:364)
>         at org.apache.qpid.qmf.ManagementExchange.publishObjectsToConsole(ManagementExchange.java:343)
>         at org.apache.qpid.qmf.ManagementExchange.publishAllConsole(ManagementExchange.java:316)
>         at org.apache.qpid.qmf.ManagementExchange$UpdateTask.run(ManagementExchange.java:497)
>         at java.util.TimerThread.mainLoop(Timer.java:512)
>         at java.util.TimerThread.run(Timer.java:462)
> Older stacks (some line numbers have changed slightly since):
> Exception in thread "SubFlushRunner-org.apache.qpid.server.subscription.Subscription_0_10@1d4d493" java.lang.NullPointerException
>         at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
>         at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:576)
>         at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:563)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:674)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.attemptDelivery(SimpleAMQQueue.java:1646)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.flushSubscription(SimpleAMQQueue.java:1585)
>         at org.apache.qpid.server.queue.SubFlushRunner.run(SubFlushRunner.java:56)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:619)
> Exception in thread "SubFlushRunner-org.apache.qpid.server.subscription.Subscription_0_10@1d4d493" java.lang.NullPointerException
>         at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
>         at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:576)
>         at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:563)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:674)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.attemptDelivery(SimpleAMQQueue.java:1646)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.flushSubscription(SimpleAMQQueue.java:1585)
>         at org.apache.qpid.server.queue.SubFlushRunner.run(SubFlushRunner.java:56)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:619)
> Exception in thread "pool-1-thread-15" java.lang.NullPointerException
>         at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
>         at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:576)
>         at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:563)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:674)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.attemptDelivery(SimpleAMQQueue.java:1646)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.processQueue(SimpleAMQQueue.java:1765)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.access$100(SimpleAMQQueue.java:70)
>         at org.apache.qpid.server.queue.SimpleAMQQueue$Runner.run(SimpleAMQQueue.java:1542)
>         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:619)

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[jira] Updated: (QPID-2430) Java broker emits NPE following qpid-tool being connected

Posted by "Robbie Gemmell (JIRA)" <qp...@incubator.apache.org>.
     [ https://issues.apache.org/jira/browse/QPID-2430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robbie Gemmell updated QPID-2430:
---------------------------------

    Status: Ready To Review  (was: In Progress)

> Java broker emits NPE following qpid-tool being connected
> ---------------------------------------------------------
>
>                 Key: QPID-2430
>                 URL: https://issues.apache.org/jira/browse/QPID-2430
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Broker, Java Management : QMF
>    Affects Versions: 0.7
>            Reporter: Robbie Gemmell
>            Assignee: Robbie Gemmell
>             Fix For: 0.7
>
>
> Whilst qpid-tool is connected to the Java broker, after a period of time the broker is seen to emit a NullPointerException. This was typically seen quickyl before the management update period was increased to 10 seconds, now it occurs after a longer period, suggesting the root cause is dependant on the number of messages sent. Thus far, the same code location has generated the NPE when called from slightly different contexts in the following 3 threads:
> Exception in thread "TimerThread-test:" java.lang.NullPointerException
> Exception in thread "pool-1-thread-X" java.lang.NullPointerException
> Exception in thread "SubFlushRunner-org.apache.qpid.server.subscription.Subscription_0_10@1d4d493" java.lang.NullPointerException
> Up to date stack (r918944):
> Exception in thread "TimerThread-test:" java.lang.NullPointerException
>         at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
>         at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:577)
>         at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:564)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:696)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverToSubscription(SimpleAMQQueue.java:641)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.enqueue(SimpleAMQQueue.java:594)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.enqueue(SimpleAMQQueue.java:519)
>         at org.apache.qpid.qmf.ManagementExchange.publishToConsole(ManagementExchange.java:364)
>         at org.apache.qpid.qmf.ManagementExchange.publishObjectsToConsole(ManagementExchange.java:343)
>         at org.apache.qpid.qmf.ManagementExchange.publishAllConsole(ManagementExchange.java:316)
>         at org.apache.qpid.qmf.ManagementExchange$UpdateTask.run(ManagementExchange.java:497)
>         at java.util.TimerThread.mainLoop(Timer.java:512)
>         at java.util.TimerThread.run(Timer.java:462)
> Older stacks (some line numbers have changed slightly since):
> Exception in thread "SubFlushRunner-org.apache.qpid.server.subscription.Subscription_0_10@1d4d493" java.lang.NullPointerException
>         at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
>         at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:576)
>         at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:563)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:674)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.attemptDelivery(SimpleAMQQueue.java:1646)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.flushSubscription(SimpleAMQQueue.java:1585)
>         at org.apache.qpid.server.queue.SubFlushRunner.run(SubFlushRunner.java:56)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:619)
> Exception in thread "SubFlushRunner-org.apache.qpid.server.subscription.Subscription_0_10@1d4d493" java.lang.NullPointerException
>         at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
>         at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:576)
>         at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:563)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:674)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.attemptDelivery(SimpleAMQQueue.java:1646)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.flushSubscription(SimpleAMQQueue.java:1585)
>         at org.apache.qpid.server.queue.SubFlushRunner.run(SubFlushRunner.java:56)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:619)
> Exception in thread "pool-1-thread-15" java.lang.NullPointerException
>         at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
>         at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:576)
>         at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:563)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:674)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.attemptDelivery(SimpleAMQQueue.java:1646)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.processQueue(SimpleAMQQueue.java:1765)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.access$100(SimpleAMQQueue.java:70)
>         at org.apache.qpid.server.queue.SimpleAMQQueue$Runner.run(SimpleAMQQueue.java:1542)
>         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:619)

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[jira] Assigned: (QPID-2430) Java broker emits NPE following qpid-tool being connected

Posted by "Robbie Gemmell (JIRA)" <qp...@incubator.apache.org>.
     [ https://issues.apache.org/jira/browse/QPID-2430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Robbie Gemmell reassigned QPID-2430:
------------------------------------

    Assignee: Robbie Gemmell

> Java broker emits NPE following qpid-tool being connected
> ---------------------------------------------------------
>
>                 Key: QPID-2430
>                 URL: https://issues.apache.org/jira/browse/QPID-2430
>             Project: Qpid
>          Issue Type: Bug
>          Components: Java Broker, Java Management : QMF
>    Affects Versions: 0.7
>            Reporter: Robbie Gemmell
>            Assignee: Robbie Gemmell
>             Fix For: 0.7
>
>
> Whilst qpid-tool is connected to the Java broker, after a period of time the broker is seen to emit a NullPointerException. This was typically seen quickyl before the management update period was increased to 10 seconds, now it occurs after a longer period, suggesting the root cause is dependant on the number of messages sent. Thus far, the same code location has generated the NPE when called from slightly different contexts in the following 3 threads:
> Exception in thread "TimerThread-test:" java.lang.NullPointerException
> Exception in thread "pool-1-thread-X" java.lang.NullPointerException
> Exception in thread "SubFlushRunner-org.apache.qpid.server.subscription.Subscription_0_10@1d4d493" java.lang.NullPointerException
> Up to date stack (r918944):
> Exception in thread "TimerThread-test:" java.lang.NullPointerException
>         at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
>         at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:577)
>         at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:564)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:696)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverToSubscription(SimpleAMQQueue.java:641)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.enqueue(SimpleAMQQueue.java:594)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.enqueue(SimpleAMQQueue.java:519)
>         at org.apache.qpid.qmf.ManagementExchange.publishToConsole(ManagementExchange.java:364)
>         at org.apache.qpid.qmf.ManagementExchange.publishObjectsToConsole(ManagementExchange.java:343)
>         at org.apache.qpid.qmf.ManagementExchange.publishAllConsole(ManagementExchange.java:316)
>         at org.apache.qpid.qmf.ManagementExchange$UpdateTask.run(ManagementExchange.java:497)
>         at java.util.TimerThread.mainLoop(Timer.java:512)
>         at java.util.TimerThread.run(Timer.java:462)
> Older stacks (some line numbers have changed slightly since):
> Exception in thread "SubFlushRunner-org.apache.qpid.server.subscription.Subscription_0_10@1d4d493" java.lang.NullPointerException
>         at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
>         at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:576)
>         at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:563)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:674)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.attemptDelivery(SimpleAMQQueue.java:1646)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.flushSubscription(SimpleAMQQueue.java:1585)
>         at org.apache.qpid.server.queue.SubFlushRunner.run(SubFlushRunner.java:56)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:619)
> Exception in thread "SubFlushRunner-org.apache.qpid.server.subscription.Subscription_0_10@1d4d493" java.lang.NullPointerException
>         at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
>         at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:576)
>         at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:563)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:674)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.attemptDelivery(SimpleAMQQueue.java:1646)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.flushSubscription(SimpleAMQQueue.java:1585)
>         at org.apache.qpid.server.queue.SubFlushRunner.run(SubFlushRunner.java:56)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
>         at java.lang.Thread.run(Thread.java:619)
> Exception in thread "pool-1-thread-15" java.lang.NullPointerException
>         at org.apache.qpid.server.txn.AutoCommitTransaction.dequeue(AutoCommitTransaction.java:55)
>         at org.apache.qpid.server.subscription.Subscription_0_10.forceDequeue(Subscription_0_10.java:576)
>         at org.apache.qpid.server.subscription.Subscription_0_10.send(Subscription_0_10.java:563)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.deliverMessage(SimpleAMQQueue.java:674)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.attemptDelivery(SimpleAMQQueue.java:1646)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.processQueue(SimpleAMQQueue.java:1765)
>         at org.apache.qpid.server.queue.SimpleAMQQueue.access$100(SimpleAMQQueue.java:70)
>         at org.apache.qpid.server.queue.SimpleAMQQueue$Runner.run(SimpleAMQQueue.java:1542)
>         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:619)

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