how to handle error or exception in jbpm workflow

[Kanahaiya Gupta]

Hi ,

I am developing one jbpm flow which looks like below-

start---->ServiceTask1---output-->ServiceTask2-----output--->ServiceTask3-->end

and want to log the exception or error if it occurs  in any of the service task either 1,2 or 3 (inside workitemhandler).But don't know how to handle exception or error in jbpm.

So,Is there any small working example or link which shows how to handle error or exception in jbpm workflow.(Plz don't suggest jbpm-examples link i have already visited there are lot of flows together so not able to get the clear pictures)

Thanks for your help in advance.

Thanks & Regards

Kanahaiya Gupta

[Maciej Swiderski]

in general, you have two options:

- include error handling within your work item handler define whatever is needed to handle exceptions

- make use of error catch events (including event subprocess) to handle exceptions within your process definition. 

First option is very close to regular programming practices as it requires you to handle exceptions on code level. usually good for handling technical exceptions rather than business logic errors. For business logic errors, better fit is with error catch events within process - either boundary error events attached to given service task or event subprocess with start error event that will deal with errors.

Here you can find an example of the second approach where we call web service endpoint and handle errors if any:

process definition: https://github.com/droolsjbpm/jbpm/blob/master/jbpm-workitems/src/test/resources/BPMN2-JaxWSServiceTaskWithErrorBoundaryEvent.bpmn2

test case: https://github.com/droolsjbpm/jbpm/blob/master/jbpm-workitems/src/test/java/org/jbpm/process/workitem/bpmn2/JaxWSServiceTaskTest.java#L132

Maciej

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[Maciej Swiderski]

this is as expected as engine runs in stack mode so it continues with other nodes when handler triggers it - via completeWorkItem

Maciej

2016-03-17 7:19 GMT+01:00 Kanahaiya Gupta <kanhaiya...@gmail.com>:

Hi Maciej,

It solved my problem...thanks..:)

One more question..

whenever i use below statement in my workitemhandler

workItemManager.completeWorkItem(workItem.getId(), responses);

 it does not execute any statement after this .it passes the control further and execute another node then execute  workitemhandler associated with that..but once all node visited then its trying to execute all the statement which i have wrote after that line in reverse order....?? which i could not understand.

Can you please help here

On Wed, Mar 16, 2016 at 12:31 PM, Kanahaiya Gupta <kanhaiya...@gmail.com> wrote:

Thanks Maciej for your response...!!

I hope it will solve my problem.let me try it out.