topic Handling exceptions of Spring ServiceTasks in Alfresco Archive

Handling exceptions of Spring ServiceTasks

gunnar1 — Wed, 16 Nov 2011 19:21:16 GMT

Hi folks,in the Userguide you're going to find a sample on how to implement dedicated Exception handling for java services. More precisely there is a chapter Handling exceptions describing how to route process execution through another path in case some exception occurs: we just have to implement Ac

Re: Handling exceptions of Spring ServiceTasks

diogosaad — Mon, 28 Nov 2011 18:58:51 GMT

Hello Folks,

I'm also in doubt on how to handle exceptions in Spring Service Tasks. Does anyone know?

Thanks,
Diogo.

Re: Handling exceptions of Spring ServiceTasks

trademak — Mon, 28 Nov 2011 21:19:23 GMT

Hi,

You could do a similar implementation like the ActivityBehavior class.
When invoking the Spring bean in the BPMN 2.0 XML you can pass the Execution instance and you can do the same thing like you included in your post.
so activiti:expression="#{springBean.method(execution)}"

Best regards,

Re: Handling exceptions of Spring ServiceTasks

gunnar1 — Wed, 30 Nov 2011 12:01:22 GMT

Thanks for your hint. I already tried that.

Have you a working sample using activiti:expression="#{springBean.method(execution)}"
and calling "execution.take(transition);" from the source code?

My experience is that setting process variables using the execution parameter works well ("execution.setVariable(…)"), but explicitely calling "execution.take(transition)" leads to exceptions signalling database unique constraint violations 😞

Gunnar

Re: Handling exceptions of Spring ServiceTasks

gant — Wed, 30 Nov 2011 17:18:36 GMT

Hi,

I use a boundary error event to handle exceptions in spring service tasks. but you have to add this construct directly in the xml, since you can't model it in the designer.

I created my own BoundaryEventAwareServiceTaskExpressionActivityBehavior class to handle the exception and changed BPMNParse to instantiate this. instaed of standard ServiceTaskExpressionActivityBehavior. If an exception occurs while calling my service, i signal the boundary error event (after evaluating the errorCode).

regards,
michael

Re: Handling exceptions of Spring ServiceTasks

gunnar1 — Thu, 01 Dec 2011 07:45:11 GMT

Hi Michael,

thank you very much. Looks like this would be the preferred BPMN like way
I'll have a look at ServiceTaskExpressionActivityBehavior.

Regards
Gunnar