Async Timer Exception

Any idea about the following stack trace ?

2016-06-28 00:22:54,865 WARN [org.camunda.bpm.engine.jobexecutor] (job-executor-tp-threads - 27) ENGINE-14002 Exception while executing job TimerEntity[repeat=null, id=1467ef40-3c98-11e6-a6d1-bca320524153, revision=2, duedate=Tue Jun 28 00:21:55 IST 2016, lockOwner=05d93d49-08b1-4030-b368-dd3034bd72c8, lockExpirationTime=Tue Jun 28 00:27:54 IST 2016, executionId=1467ef3e-3c98-11e6-a6d1-bca320524153, processInstanceId=14638247-3c98-11e6-a6d1-bca320524153, isExclusive=true, retries=3, jobHandlerType=timer-intermediate-transition, jobHandlerConfiguration=IntermediateCatchEvent_1626t7x, exceptionByteArray=null, exceptionByteArrayId=null, exceptionMessage=null, deploymentId=00ea28ab-3c98-11e6-a6d1-bca320524153]: : java.util.ConcurrentModificationException
at java.util.Vector$Itr.checkForComodification(Vector.java:1184) [rt.jar:1.8.0_25]
at java.util.Vector$Itr.next(Vector.java:1137) [rt.jar:1.8.0_25]
at -----
at org.camunda.bpm.engine.impl.bpmn.delegate.JavaDelegateInvocation.invoke(JavaDelegateInvocation.java:36) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.delegate.DelegateInvocation.proceed(DelegateInvocation.java:54) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.delegate.DefaultDelegateInterceptor.handleInvocationInContext(DefaultDelegateInterceptor.java:87) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.delegate.DefaultDelegateInterceptor.handleInvocation(DefaultDelegateInterceptor.java:59) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.bpmn.behavior.ServiceTaskDelegateExpressionActivityBehavior$3.call(ServiceTaskDelegateExpressionActivityBehavior.java:112) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.bpmn.behavior.ServiceTaskDelegateExpressionActivityBehavior$3.call(ServiceTaskDelegateExpressionActivityBehavior.java:98) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.bpmn.behavior.AbstractBpmnActivityBehavior.executeWithErrorPropagation(AbstractBpmnActivityBehavior.java:105) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.bpmn.behavior.ServiceTaskDelegateExpressionActivityBehavior.execute(ServiceTaskDelegateExpressionActivityBehavior.java:123) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationActivityExecute.execute(PvmAtomicOperationActivityExecute.java:41) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationActivityExecute.execute(PvmAtomicOperationActivityExecute.java:26) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.AtomicOperationInvocation.execute(AtomicOperationInvocation.java:81) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.invokeNext(CommandContext.java:181) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performNext(CommandContext.java:160) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:135) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:496) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:473) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationTransitionNotifyListenerStart.eventNotificationsCompleted(PvmAtomicOperationTransitionNotifyListenerStart.java:56) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationTransitionNotifyListenerStart.eventNotificationsCompleted(PvmAtomicOperationTransitionNotifyListenerStart.java:26) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.core.operation.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:65) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.AtomicOperationInvocation.execute(AtomicOperationInvocation.java:81) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.invokeNext(CommandContext.java:181) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performNext(CommandContext.java:160) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:135) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:125) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:507) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:482) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.core.operation.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:58) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.AtomicOperationInvocation.execute(AtomicOperationInvocation.java:81) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.invokeNext(CommandContext.java:181) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performNext(CommandContext.java:160) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:135) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:125) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:507) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:482) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.core.operation.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:58) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.AtomicOperationInvocation.execute(AtomicOperationInvocation.java:81) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.invokeNext(CommandContext.java:181) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performNext(CommandContext.java:160) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:135) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:125) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:507) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:482) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.core.operation.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:58) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.AtomicOperationInvocation.execute(AtomicOperationInvocation.java:81) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.invokeNext(CommandContext.java:181) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performNext(CommandContext.java:160) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:135) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:496) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:473) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationTransitionCreateScope.scopeCreated(PvmAtomicOperationTransitionCreateScope.java:34) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationCreateScope.execute(PvmAtomicOperationCreateScope.java:49) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationCreateScope.execute(PvmAtomicOperationCreateScope.java:23) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.AtomicOperationInvocation.execute(AtomicOperationInvocation.java:81) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.invokeNext(CommandContext.java:181) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performNext(CommandContext.java:168) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:135) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:496) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:473) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.PvmExecutionImpl.take(PvmExecutionImpl.java:673) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationTransitionDestroyScope.execute(PvmAtomicOperationTransitionDestroyScope.java:85) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationTransitionDestroyScope.execute(PvmAtomicOperationTransitionDestroyScope.java:33) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.AtomicOperationInvocation.execute(AtomicOperationInvocation.java:81) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.invokeNext(CommandContext.java:181) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performNext(CommandContext.java:160) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:135) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:496) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:473) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationTransitionNotifyListenerEnd.eventNotificationsCompleted(PvmAtomicOperationTransitionNotifyListenerEnd.java:37) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.operation.PvmAtomicOperationTransitionNotifyListenerEnd.eventNotificationsCompleted(PvmAtomicOperationTransitionNotifyListenerEnd.java:23) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.core.operation.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:65) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.AtomicOperationInvocation.execute(AtomicOperationInvocation.java:81) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.invokeNext(CommandContext.java:181) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performNext(CommandContext.java:160) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:135) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:125) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:507) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:482) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.core.operation.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:58) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.AtomicOperationInvocation.execute(AtomicOperationInvocation.java:81) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.invokeNext(CommandContext.java:181) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performNext(CommandContext.java:160) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:135) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:125) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:507) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperationSync(ExecutionEntity.java:482) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.core.operation.AbstractEventAtomicOperation.execute(AbstractEventAtomicOperation.java:58) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.AtomicOperationInvocation.execute(AtomicOperationInvocation.java:81) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.invokeNext(CommandContext.java:181) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performNext(CommandContext.java:160) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext$1.call(CommandContext.java:151) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext$1.call(CommandContext.java:149) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.context.ProcessApplicationClassloaderInterceptor.call(ProcessApplicationClassloaderInterceptor.java:44) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.application.AbstractProcessApplication.execute(AbstractProcessApplication.java:117) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.application.AbstractProcessApplication.execute(AbstractProcessApplication.java:130) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.context.Context.executeWithinProcessApplication(Context.java:192) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performNext(CommandContext.java:149) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContext.performOperation(CommandContext.java:135) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:496) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.ExecutionEntity.performOperation(ExecutionEntity.java:473) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.PvmExecutionImpl.leaveActivityViaTransitions(PvmExecutionImpl.java:885) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.PvmExecutionImpl.leaveActivityViaTransition(PvmExecutionImpl.java:838) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.bpmn.behavior.BpmnActivityBehavior.performOutgoingBehavior(BpmnActivityBehavior.java:101) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.bpmn.behavior.BpmnActivityBehavior.performDefaultOutgoingBehavior(BpmnActivityBehavior.java:52) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.bpmn.behavior.FlowNodeActivityBehavior.leave(FlowNodeActivityBehavior.java:46) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.bpmn.behavior.AbstractBpmnActivityBehavior.leave(AbstractBpmnActivityBehavior.java:68) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.bpmn.behavior.IntermediateCatchEventActivityBehavior.signal(IntermediateCatchEventActivityBehavior.java:46) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.pvm.runtime.PvmExecutionImpl.signal(PvmExecutionImpl.java:652) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.jobexecutor.TimerCatchIntermediateEventJobHandler.execute(TimerCatchIntermediateEventJobHandler.java:40) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.persistence.entity.JobEntity.execute(JobEntity.java:124) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.cmd.ExecuteJobsCmd.execute(ExecuteJobsCmd.java:103) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:95) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.JtaTransactionInterceptor.execute(JtaTransactionInterceptor.java:58) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.ProcessApplicationContextInterceptor.execute(ProcessApplicationContextInterceptor.java:66) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:30) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.jobexecutor.ExecuteJobsRunnable.executeJob(ExecuteJobsRunnable.java:79) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.camunda.bpm.engine.impl.jobexecutor.ExecuteJobsRunnable.run(ExecuteJobsRunnable.java:66) [camunda-engine-7.4.5-ee.jar:7.4.5-ee]
at org.jboss.threads.SimpleDirectExecutor.execute(SimpleDirectExecutor.java:33)
at org.jboss.threads.QueueExecutor.runTask(QueueExecutor.java:808)
at org.jboss.threads.QueueExecutor.access$100(QueueExecutor.java:45)
at org.jboss.threads.QueueExecutor$Worker.run(QueueExecutor.java:828)
at java.lang.Thread.run(Thread.java:745) [rt.jar:1.8.0_25]
at org.jboss.threads.JBossThread.run(JBossThread.java:122)

Hi,

The top entries of your stacktrace are missing, so that is hard to tell. I guess the error is related to one of your JavaDelegate implementations.

Cheers,
Thorben

yes, its about the java delegate implementation of collection update Iterators problem

Does that mean the problem is solved?

Cheers,
Thorben

Yes, Problem solved !