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Concurrent Modification exception in task server when running with 100 concurrent users
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created by <a href="https://community.jboss.org/people/itsnagesh">nageswara Rao</a> in <i>jBPM</i> - <a href="https://community.jboss.org/message/790471#790471">View the full discussion</a>
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<div class="jive-rendered-content"><p>I have a business process with 5 manual activities with a fork, initially all user tasks are assigned to business admin</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>My scenario is like start process instance for this Process,  then business admin deligate each task to a seperate user and that user will complete the task then next task will be created</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>When i execute this scenario with 100 concurrent users in load runner then 2% of the markdone operations are failing with Concurrent modifcation exception</p><p> [java] java.util.ConcurrentModificationException</p><p>     [java]  at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372)</p><p>     [java]  at java.util.AbstractList$Itr.next(AbstractList.java:343)</p><p>     [java]  at org.jbpm.task.event.MessagingTaskEventListener.taskCompleted(MessagingTaskEventListener.java:72)</p><p>     [java]  at org.jbpm.task.event.TaskEventSupport.fireTaskCompleted(TaskEventSupport.java:47)</p><p>     [java]  at org.jbpm.task.service.TaskServiceSession.postTaskCompleteOperation(TaskServiceSession.java:497)</p><p>     [java]  at org.jbpm.task.service.TaskServiceSession.taskOperation(TaskServiceSession.java:463)</p><p>     [java]  at org.jbpm.task.service.TaskServerHandler.messageReceived(TaskServerHandler.java:84)</p><p>     [java]  at org.jbpm.task.service.mina.MinaTaskServerHandler.messageReceived(MinaTaskServerHandler.java:41)</p><p>     [java]  at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:716)</p><p>     [java]  at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)</p><p>     [java]  at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)</p><p>     [java]  at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)</p><p>     [java]  at org.apache.mina.filter.codec.ProtocolCodecFilter$ProtocolDecoderOutputImpl.flush(ProtocolCodecFilter.java:427)</p><p>     [java]  at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:245)</p><p>     [java]  at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)</p><p>     [java]  at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)</p><p>     [java]  at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)</p><p>     [java]  at org.apache.mina.filter.logging.LoggingFilter.messageReceived(LoggingFilter.java:177)</p><p>     [java]  at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)</p><p>     [java]  at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:46)</p><p>     [java]  at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:796)</p><p>     [java]  at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:119)</p><p>     [java]  at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:434)</p><p>     [java]  at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:426)</p><p>     [java]  at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:692)</p><p>     [java]  at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:645)</p><p>     [java]  at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:634)</p><p>     [java]  at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$400(AbstractPollingIoProcessor.java:66)</p><p>     [java]  at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1078)</p><p>     [java]  at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)</p><p>     [java]  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)</p><p>     [java]  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)</p><p>     [java]  at java.lang.Thread.run(Thread.java:662)</p></div>
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