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).
