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https://issues.apache.org/jira/browse/QPID-7777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16006368#comment-16006368
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Keith Wall commented on QPID-7777:
----------------------------------
This problem can only occur on master. 6.1.x is not affected.
We have a race between flowToDisk and a consumer target.
# Flow to disk calls MessageMetaData_1_0#clearEncodedForm, which internally
calls MessageMetaData_1_0#dispose! This calls dispose on all the sections.
# Meanwhile, a consumer executes ConsumerTarget_1_0#doSend which gets the
HeaderSection from the MMD. The HeaderSection it gets belongs to the
MessageMetaData_1_0 (same object). The ConsumerTarget then NPEs when it calls
payload.addAll(headerSection.getEncodedForm()).
I see three problems:
# MessageMetaData_1_0#clearEncodedForm should be asking the Sections to
clearEncodedForm, not dispose (we are not done with them yet).
# Sections needs to be prepared to recreate the encoded form (like their AMQP
0-9 counterparts).
# MessageMetaData_1_0.getHeader should not expose its own HeaderSection but a
copy. The caller needs to dispose of it once he’s done.
> [AMQP 1.0] NPE during consumer target delivery path
> ----------------------------------------------------
>
> Key: QPID-7777
> URL: https://issues.apache.org/jira/browse/QPID-7777
> Project: Qpid
> Issue Type: Bug
> Components: Java Broker
> Affects Versions: qpid-java-broker-7.0.0
> Reporter: Keith Wall
> Fix For: qpid-java-broker-7.0.0
>
>
> The following NPE was encountered during a performance test run. The logs
> showed that the Broker was flowing messages to disk at the time.
> {noformat}
> java.lang.NullPointerException: null
> at
> org.apache.qpid.server.protocol.v1_0.type.messaging.AbstractSection.getEncodedForm(AbstractSection.java:78)
> at
> org.apache.qpid.server.protocol.v1_0.ConsumerTarget_1_0.doSend(ConsumerTarget_1_0.java:157)
> at
> org.apache.qpid.server.consumer.AbstractConsumerTarget.send(AbstractConsumerTarget.java:206)
> at
> org.apache.qpid.server.consumer.AbstractConsumerTarget.sendNextMessage(AbstractConsumerTarget.java:247)
> at
> org.apache.qpid.server.consumer.AbstractConsumerTarget.processPending(AbstractConsumerTarget.java:142)
> at
> org.apache.qpid.server.session.AbstractAMQPSession.processPending(AbstractAMQPSession.java:391)
> at
> org.apache.qpid.server.protocol.v1_0.AMQPConnection_1_0Impl$ProcessPendingIterator$3.run(AMQPConnection_1_0Impl.java:1755)
> at
> org.apache.qpid.server.transport.NonBlockingConnection.processPending(NonBlockingConnection.java:356)
> at
> org.apache.qpid.server.transport.NonBlockingConnection.doWork(NonBlockingConnection.java:264)
> at
> org.apache.qpid.server.transport.NetworkConnectionScheduler.processConnection(NetworkConnectionScheduler.java:124)
> at
> org.apache.qpid.server.transport.SelectorThread$ConnectionProcessor.processConnection(SelectorThread.java:563)
> at
> org.apache.qpid.server.transport.SelectorThread$ConnectionProcessor.run(SelectorThread.java:551)
> at
> org.apache.qpid.server.transport.SelectorThread.run(SelectorThread.java:521)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
> at java.lang.Thread.run(Thread.java:745)
> {noformat}
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