I am trying to convert 11 complex workflows from JBPM to Activiti. They all contain serviceTasks only; and they all have one more multi-task loops. As shown in attached image. Cardinality of such loops could reach 60. So; I am facing StackOverFlow Errors. I introduced a RecieveTask. My aim with RecieveTask; is to save ”callStack” into DB and continue the loops, until it exits based on exclusive-gate condition. Option 1: Add executionListener; <receiveTask id="waitTask" name="Dummy Wait State to force db commit"> <extensionElements> <activiti:executionListener event="start" delegateExpression="${receiveTaskListener}"/> </extensionElements> </receiveTask>
@Component("receiveTaskListener")public class ReceiveTaskListener implements ExecutionListener { public void notify(DelegateExecution execution) throws Exception { Task task = execution.getEngineServices().getTaskService().createTaskQuery() .taskDefinitionKey("waitTask").singleResult(); execution.getEngineServices().getTaskService().complete(task.getId()); }}
This setup throws “already taking a transition” exeception. Option 2: Add EventListener. public class ProcessListener implements ActivitiEventListener { @Override public void onEvent(ActivitiEvent event) { switch (event.getType()) { case ACTIVITY_STARTED: ExecutionQuery q = event.getEngineServices().getRuntimeService().createExecutionQuery(); List<Execution> executions = q.processInstanceId(event.getProcessInstanceId()) .activityId("waitTask").list(); if (executions != null) { for (Execution execution : executions) { event.getEngineServices().getRuntimeService().signal(execution.getId()); } }
This signal stops the entire execution. Can someone please suggest, on how to continue the loops without StackOverFlow error. Note: I cannot have external triggers(like JMS or Thread waits).
