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https://issues.apache.org/activemq/browse/SM-1840?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=51096#action_51096
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Freeman Fang commented on SM-1840:
----------------------------------
Hi Ron,
Just figure out how the hang happen
You work flow is
wsdl-first-cxf-bridge-sa.jar - cxf-bc http (in-out) consumer -> cxf-bc jms
(in-out) provider -->
wsdl-first-cxf-sa.jar - cxf-bc jms (in-out) consumer -> cxf-se (in-out)
PersonImpl
You deploy wsdl-first-cxf-bridge-sa.jar first and send request to cxf-bc http
(in-out) consumer with client.html, since at this time wsdl-first-cxf-sa.jar
not deploy yet, so mesage exchange send from cxf-bc http (in-out) consumer to
cxf-bc jms (in-out) provider will wait for the response, which means the
ReentrantReadWriteLock.ReadLock is holded by the flow.
And then you deploy wsdl-first-cxf-sa.jar, which in turn AbstractFlow.suspend()
get invoked which will try to grap the ReentrantReadWriteLock.WriteLock(only
success if no other thread hold the ReentrantReadWriteLock.ReadLock and
WriteLock, otherwise will hang), but it's impossible since the
ReentrantReadWriteLock.ReadLock can't be released until the cxf-bc http
(in-out) consumer get response mesasge exchange (which means it wait for
wsdl-first-cxf-sa.jar deploy sucessfully, but wsdl-first-cxf-sa.jar deploy need
the writelock first ). You see the deadlock happen then.
We could use ReentrantReadWriteLock.WriteLock.tryLock specifying the timeout to
break the deadlock.
Freeman
> AutoDeploymentService hangs on deployment of cxf-bc & smx-jmx in-out jms
> consumer when in-out provider has already placed messages on queue
> -------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: SM-1840
> URL: https://issues.apache.org/activemq/browse/SM-1840
> Project: ServiceMix
> Issue Type: Bug
> Components: servicemix-core
> Affects Versions: 3.2.4
> Environment: JDK 5 Update 18, Windows XP, SMX 3.2.4-SNAPSHOT
> (4/6/2009)
> Reporter: Ron Gavlin
> Assignee: Freeman Fang
> Priority: Critical
> Attachments: client.html, cxf-wsdl-first-http2jms-src.zip,
> wsdl-first-cxf-bridge-sa.jar, wsdl-first-cxf-sa.jar
>
>
> Attached, please find two service assemblies, wsdl-first-cxf-bridge-sa.jar
> and wsdl-first-cxf-sa.jar. Perform the following steps to reproduce this
> critical issue:
> 1. Start SMX
> 2. Deploy wsdl-first-cxf-bridge-sa.jar
> 3. Open the cxf-wsdl-first client.html in a browser and send a request
> message (note that a jms message is placed on the ActiveMQ person.queue queue)
> 4. Deploy wsdl-first-cxf-sa.jar (note that the AutoDeploymentService hangs
> while attempting to deploy this service assembly)
> The following thread dump, generated by a ctrl-break, provides insight into
> the state of the hung AutoDeploymentService thread:
> {quote}
> "Timer-4" daemon prio=6 tid=0x2880bbc8 nid=0x1074 waiting on condition
> [0x2accf000..0x2accfb18]
> at sun.misc.Unsafe.park(Native Method)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:118)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:7
> 16)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:746)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1076)
> at
> org.apache.servicemix.locks.ReentrantReadWriteLock$NonfairSync.wlock(ReentrantReadWriteLock.java:245)
> at
> org.apache.servicemix.locks.ReentrantReadWriteLock$WriteLock.lock(ReentrantReadWriteLock.java:545)
> at
> org.apache.servicemix.jbi.nmr.flow.AbstractFlow.suspend(AbstractFlow.java:136)
> - locked <0x077f1fa0> (a
> org.apache.servicemix.jbi.nmr.flow.seda.SedaFlow)
> at
> org.apache.servicemix.jbi.nmr.DefaultBroker.suspend(DefaultBroker.java:250)
> at
> org.apache.servicemix.jbi.framework.AutoDeploymentService.updateArchive(AutoDeploymentService.java:250)
> at
> org.apache.servicemix.jbi.framework.AutoDeploymentService.monitorDirectory(AutoDeploymentService.java:667)
> at
> org.apache.servicemix.jbi.framework.AutoDeploymentService.access$800(AutoDeploymentService.java:62)
> at
> org.apache.servicemix.jbi.framework.AutoDeploymentService$1.run(AutoDeploymentService.java:631)
> at java.util.TimerThread.mainLoop(Timer.java:512)
> at java.util.TimerThread.run(Timer.java:462)
> {quote}
> Please let me know if you would like the sources for this project. Also,
> please note that this problem also occurs when the smx-cxf-bc in-out jms
> provider and consumer endpoints are replaced with either the new or old
> smx-jmx endpoints.
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