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https://issues.apache.org/jira/browse/ARTEMIS-3509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17457273#comment-17457273
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Justin Bertram commented on ARTEMIS-3509:
-----------------------------------------
In my experience it's relatively uncommon for logs to be very helpful in this
kind of scenario. Given that your application is exposing this exception it's
feasible that you could work backwards to create a test-case based on what your
application is doing. At the very least, a clear & complete description of what
the application is doing might help someone else reproduce the exception. Can
you provide either of these?
> STOMP Websocket client disconnected after ConcurrentModificationException in
> Broker
> -----------------------------------------------------------------------------------
>
> Key: ARTEMIS-3509
> URL: https://issues.apache.org/jira/browse/ARTEMIS-3509
> Project: ActiveMQ Artemis
> Issue Type: Bug
> Components: Broker
> Affects Versions: 2.16.0
> Reporter: Elodie Vandromme
> Priority: Major
>
> Web clients connected through WebSocket are randomly disconnected from
> artemis broker without notification of the disconnection.
> A ConcurrentModificationException is raised;
> {noformat}
> [2021-09-28 10:26:53,591] - [WILDFLY] - [WARN ] - [Thread-11
> ([ActiveMQ-server-org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl$6@444dc7ba|mailto:ActiveMQ-server-org.apache.activemq.artemis.core.server.impl.ActiveMQServerImpl$6@444dc7ba])]
> - [org.apache.activemq.artemis.core.server] : *AMQ222151: removing consumer
> which did not handle a message*, consumer=ServerConsumerImpl [id=1990,
> filter=null, binding=LocalQueueBinding [address=jms.topic.defended_assetFull,
> queue=QueueImpl[name=d1586796-2035-11ec-8d2e-00505689a76b,
> postOffice=PostOfficeImpl
> [server=ActiveMQServerImpl::serverUUID=2f00c36f-2034-11ec-8d2e-00505689a76b],
> temp=true]@4180826b, filter=null, name=d1586796-2035-11ec-8d2e-00505689a76b,
> clusterName=d1586796-2035-11ec-8d2e-00505689a76b2f00c36f-2034-11ec-8d2e-00505689a76b]],
>
> message=Reference[2019]:RELIABLE:CoreMessage[messageID=2019,durable=true,userID=d5e2d1c3-2035-11ec-8d2e-00505689a76b,priority=4,
> timestamp=Tue Sep 28 10:26:53 CEST 2021,expiration=0, durable=true,
> address=jms.topic.defended_assetFull,size=6520,properties=TypedProperties[__AMQ_CID=f9eab79a-2034-11ec-8d2e-00505689a76b,_AMQ_ROUTING_TYPE=0]]@155890432:
> java.util.ConcurrentModificationException
> at
> java.util.ArrayList$Itr.checkForComodification(ArrayList.java:909)
> at java.util.ArrayList$Itr.next(ArrayList.java:859)
> at
> org.apache.activemq.artemis.core.server.impl.RefsOperation.afterCommit(RefsOperation.java:179)
> at
> org.apache.activemq.artemis.core.transaction.impl.TransactionImpl.afterCommit(TransactionImpl.java:579)
> at
> org.apache.activemq.artemis.core.transaction.impl.TransactionImpl.access$100(TransactionImpl.java:40)
> at
> org.apache.activemq.artemis.core.transaction.impl.TransactionImpl$2.done(TransactionImpl.java:322)
> at
> org.apache.activemq.artemis.core.persistence.impl.journal.OperationContextImpl.executeOnCompletion(OperationContextImpl.java:190)
> at
> org.apache.activemq.artemis.core.persistence.impl.journal.OperationContextImpl.executeOnCompletion(OperationContextImpl.java:128)
> at
> org.apache.activemq.artemis.core.persistence.impl.journal.AbstractJournalStorageManager.afterCompleteOperations(AbstractJournalStorageManager.java:321)
> at
> org.apache.activemq.artemis.core.transaction.impl.TransactionImpl.commit(TransactionImpl.java:313)
> at
> org.apache.activemq.artemis.core.transaction.impl.TransactionImpl.commit(TransactionImpl.java:264)
> at
> org.apache.activemq.artemis.core.server.impl.ServerSessionImpl.commit(ServerSessionImpl.java:1284)
> at
> org.apache.activemq.artemis.core.protocol.stomp.StompSession$1.run(StompSession.java:164)
> at
> org.apache.activemq.artemis.core.protocol.stomp.StompSession.afterDelivery(StompSession.java:116)
> at
> org.apache.activemq.artemis.core.server.impl.ServerConsumerImpl.proceedDeliver(ServerConsumerImpl.java:511)
> at
> org.apache.activemq.artemis.core.server.impl.QueueImpl.proceedDeliver(QueueImpl.java:3744)
> at
> org.apache.activemq.artemis.core.server.impl.QueueImpl.deliver(QueueImpl.java:3048)
> at
> org.apache.activemq.artemis.core.server.impl.QueueImpl.access$2400(QueueImpl.java:125)
> at
> org.apache.activemq.artemis.core.server.impl.QueueImpl$DeliverRunner.run(QueueImpl.java:4119)
> at
> org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:42)
> at
> org.apache.activemq.artemis.utils.actors.OrderedExecutor.doTask(OrderedExecutor.java:31)
> at
> org.apache.activemq.artemis.utils.actors.ProcessorBase.executePendingTasks(ProcessorBase.java:65)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at
> org.apache.activemq.artemis.utils.ActiveMQThreadFactory$1.run(ActiveMQThreadFactory.java:118)
> {noformat}
> Artemis (2.16.0) is deployed in Wildfly (24.0.1.Final)
> Clients are connected to stomp acceptor:
> {code:xml}
> <acceptor name="stomp-over-ws"
> factory-class="org.apache.activemq.artemis.core.remoting.impl.netty.NettyAcceptorFactory">
> <param name="host" value="0.0.0.0" />
> <param name="protocols" value="STOMP" />
> <param name="port" value="61614" />
> </acceptor>
> {code}
> Bug is random but is reproduced quite often with a full scenario we have (on
> one topic or another) so we are able to reproduce it and add logs if
> necessary.
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