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From "Marnie McCormack (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (QPID-2430) Java broker emits NPE following qpid-tool being connected
Date Wed, 01 Dec 2010 22:18:12 GMT

     [ https://issues.apache.org/jira/browse/QPID-2430?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Marnie McCormack resolved QPID-2430.
------------------------------------

    Resolution: Fixed

> 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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