java.lang.NullPointerException when leaving parallel multiinstance-subprocess

[m.radli...@gmail.com]

Hi,

I'm getting a NPE which is not really reproducable (at least not for me). It seems, that the ParallelMultiInstanceBehavior.getLoopVariable() returns a null-value Integer object which is then cast to a primitive int in the ParallelMultiInstanceBehavior.leave() method.

Do you guys have any idea which state in the multiinstance process could cause this exception and how I could avoid that?

Thank you very much!

Cheers,
Michi

Last but not least, the stacktrace:

java.lang.NullPointerException: null
at org.camunda.bpm.engine.impl.bpmn.behavior.ParallelMultiInstanceBehavior.leave(ParallelMultiInstanceBehavior.java:101) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.bpmn.behavior.MultiInstanceActivityBehavior.lastExecutionEnded(MultiInstanceActivityBehavior.java:133) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationActivityEnd.eventNotificationsCompleted(AtomicOperationActivityEnd.java:76) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:63) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:56) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.end(ExecutionEntity.java:406) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.bpmn.behavior.NoneEndEventActivityBehavior.execute(NoneEndEventActivityBehavior.java:24) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:44) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyListenerStart.eventNotificationsCompleted(AtomicOperationTransitionNotifyListenerStart.java:55) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:63) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:56) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationTransitionCreateScope.execute(AtomicOperationTransitionCreateScope.java:54) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyListenerTake.execute(AtomicOperationTransitionNotifyListenerTake.java:69) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyListenerTake.execute(AtomicOperationTransitionNotifyListenerTake.java:58) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationTransitionDestroyScope.execute(AtomicOperationTransitionDestroyScope.java:117) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyListenerEnd.eventNotificationsCompleted(AtomicOperationTransitionNotifyListenerEnd.java:36) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:63) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:56) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.take(ExecutionEntity.java:438) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.bpmn.behavior.ExclusiveGatewayActivityBehavior.leave(ExclusiveGatewayActivityBehavior.java:74) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.bpmn.behavior.FlowNodeActivityBehavior.execute(FlowNodeActivityBehavior.java:36) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:44) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyListenerStart.eventNotificationsCompleted(AtomicOperationTransitionNotifyListenerStart.java:55) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:63) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:56) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationTransitionCreateScope.execute(AtomicOperationTransitionCreateScope.java:54) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyListenerTake.execute(AtomicOperationTransitionNotifyListenerTake.java:69) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyListenerTake.execute(AtomicOperationTransitionNotifyListenerTake.java:58) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationTransitionDestroyScope.execute(AtomicOperationTransitionDestroyScope.java:117) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AtomicOperationTransitionNotifyListenerEnd.eventNotificationsCompleted(AtomicOperationTransitionNotifyListenerEnd.java:36) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:63) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:56) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.pvm.runtime.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:56) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:121) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext$1.call(CommandContext.java:105) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext$1.call(CommandContext.java:103) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.application.AbstractProcessApplication.execute(AbstractProcessApplication.java:100) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.context.Context.executeWithinProcessApplication(Context.java:138) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:103) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:609) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:600) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.take(ExecutionEntity.java:438) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.bpmn.behavior.BpmnActivityBehavior.performOutgoingBehavior(BpmnActivityBehavior.java:102) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.bpmn.behavior.BpmnActivityBehavior.performDefaultOutgoingBehavior(BpmnActivityBehavior.java:51) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.bpmn.behavior.FlowNodeActivityBehavior.leave(FlowNodeActivityBehavior.java:44) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.bpmn.behavior.AbstractBpmnActivityBehavior.leave(AbstractBpmnActivityBehavior.java:47) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.bpmn.behavior.ReceiveTaskActivityBehavior.signal(ReceiveTaskActivityBehavior.java:35) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.signal(ExecutionEntity.java:421) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.cmd.SignalCmd.execute(SignalCmd.java:71) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:32) ~[camunda-engine-7.0.0-Final.jar:na]
at org.camunda.bpm.engine.impl.RuntimeServiceImpl.signal(RuntimeServiceImpl.java:202) ~[camunda-engine-7.0.0-Final.jar:na]
at sun.reflect.GeneratedMethodAccessor263.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_40]
at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_40]
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317) [spring-aop-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183) [spring-aop-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) [spring-aop-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96) [spring-tx-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260) [spring-tx-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94) [spring-tx-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) [spring-aop-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204) [spring-aop-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at com.sun.proxy.$Proxy32.onMessage(Unknown Source) [na:na]
at org.springframework.jms.listener.adapter.MessageListenerAdapter.onMessage(MessageListenerAdapter.java:339) [spring-jms-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:537) [spring-jms-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:497) [spring-jms-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:468) [spring-jms-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:325) [spring-jms-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:243) [spring-jms-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:1103) [spring-jms-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:1095) [spring-jms-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:992) [spring-jms-3.2.4.RELEASE.jar:3.2.4.RELEASE]
at java.lang.Thread.run(Thread.java:724) [na:1.7.0_40]

[Nico Rehwaldt]

Hi Michael, 

not really reproducable does not sound like something that it fun to debug. 

Could you attach a example process, mini-setup or (best) a test case that fails at some point?

Based on the stack trace this may be an engine bug and we would like to try to reproduce it. 

Regards, 

Nico

[Michael Radlingmaier]

Hi Nico,

I tried to reproduce the error, but as expected, without success. Nevertheless, I attached the Unit test and the bpmn.

Another thing: do you know why this testcase fails with an OptimisticLockingException as soon as I increase the maximum number of parallel signals to > 18 (line 50) --> OptimisticLockingException is caught explicitely in line 60 and this works fine for threadpools with size <=18?

Has this something to do with the DB-connection pool size?

Thanks,

Cheers,

  Michael

[Roman Smirnov]

Hi Michael,

the OptimisticLockingException occurs because you start concurrent threads to signal an execution and the threads tries to update the same parent execution concurrently. So, if you would signal in a single thread for each execution the OptimisticLockingException would not occur.

I am not able to reproduce the NullPointerException, but I created a Issue CAM-1721 to throw a more specific exception, when the loop variable is null in some situations.

Cheers,

Roman

[Michael Radlingmaier]

Hi Roman,

I'm catching the OptimisiticLockingException and then do a retry on the signal (after a short sleeptime) - I think that this is the only way to signal multiple executions to the engine in parallel (if the executions are part of the same process instance).

Therefore I'm a little bit confused why the test fails with this exception (should be caught and therefore not failing).

Thanks for the Jira item, I think that this will definitely help to take care of this problem in my application.

Cheers,

 Michael