How to get access to source BpmnError in error start event subprocess?

[lehvolk]

Hi,
I have a process whick called many times in a loop. If during execution some error occured I want to add a message into report. I try to make sub-process with error start event such this:

<subProcess id="error-handling" name="error-handling" triggeredByEvent="true">
   <startEvent id="start-error-event" name="start error event">
      <errorEventDefinition />
   </startEvent>
   <serviceTask id="add-error" name="add error to report"  activiti:expression="${reports.addError(….)}"></serviceTask>
….
</subProcess>
‍‍‍‍‍‍‍‍‍

But inside of this sub-process I couldn't find any way to access the source exception (BpmnError or other). Does anybody know any standard way to do this or any workaround?

[lehvolk]

Still no ideas? It seems that it is common case like in try-catch, when you have access to caught exception.

[trademak]

That's not how the BpmnError is meant to be used. You should look at it as a logical error with a simple id or errorRef property only. So it's not meant to pass along technical exceptions. If you want to do that it's best to use a process variable.

Best regards,

[lehvolk]

Thanks for answer. I check source code and find class ErrorPropagation which implement logic for error handling. As I see not BpmnError and error code not set into the execution. So in my case (where I want to handle BpmnError's with all codes) I also can't get error code. Is this true? 

Can you tell me Is it safe to correct activiti engine ErrorPropagation by this code:
<code>
  public static void propagateError(BpmnError error, ActivityExecution execution) throws Exception {   
      execution.setVariableLocal("__errorCodeAlias", error.getErrorCode());
      propagateError(error.getErrorCode(), execution);
  }
</code>

[trademak]

What do you mean with "I also can't get error code" ? From where?
If you want to change the Activiti core logic that's of course up to you, but upgrading to a new version might be more difficult then.

Best regards,

[lehvolk]

As I understand there is no access to errorCode inside this sub-process which handles all kind of business errors. In curent activiti version the only way to separate logic between them is to define two sub-processes with error start events for different error codes.

Thanks a lot for answers.

[trademak]

Yes, that's correct. Two separate event sub processes would work. But it would be an improvement if you could also do this in the same event sub process. Could you raise a JIRA for this?

Thanks,