Trigger Activiti workflow for task sitting in ReceiveTask causes a loop

ungawunga — Tue, 02 Apr 2013 19:16:14 GMT

I have an Activiti workflow that contains a ReceiveTask where I'm grouping tasks. I have a Listener that triggers on the event start of the ReceiveTask where I check the property of the newly added task to see if others with the same properties are in the same state. If yes, then I want to trigger t

Re: Trigger Activiti workflow for task sitting in ReceiveTask causes a loop

ungawunga — Wed, 03 Apr 2013 13:40:33 GMT

Let me ask the question in a different way: What is the correct process to follow to signal a task to continue in the workflow in a listener when the task in question is the one that triggered the listener?

I made some changes to the above code by hunting through the source code and randomly trying things. Calling "signal" on the WorkflowPath associated with the NodeRef's WorkflowInstance instead of the WorkflowInstance itself seems to have changed the infinite loop behavior, but my listener is still be called multiple times.


for( NodeRef siblingNode : siblingNodes )
{
    List<WorkflowInstance> workflows = workflowService.getWorkflowsForContent( siblingNode, true );
    List<WorkflowPath> paths = workflowService.getWorkflowPaths( workflows.get(0).getId() );
    for( WorkflowPath path : paths )
    {
        workflowService.signal( path.getId(), null );
    }
}
‍‍‍‍‍‍‍‍‍‍‍

This lead to a different exception the second time the listener was called :

JavaException: org.activiti.engine.ActivitiOptimisticLockingException: ExecutionEntity[7925] was updated by another transaction concurrently

This makes sense, as the first time the listener is called, the task moves on through the workflow and is deleted before the listener is called a second time. But I still need to resolve why the listener is being called multiple times.

Re: Trigger Activiti workflow for task sitting in ReceiveTask causes a loop

ungawunga — Thu, 04 Apr 2013 20:36:12 GMT

Not too many people with experience with Activiti? lol… Any suggestions on ways to debug this instead of just hunting/pecking/trying stuff?

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Trigger Activiti workflow for task sitting in ReceiveTask causes a loop

Re: Trigger Activiti workflow for task sitting in ReceiveTask causes a loop

Re: Trigger Activiti workflow for task sitting in ReceiveTask causes a loop