[jboss-user] [JBoss jBPM] - General Exception Handling in JBPM

[Cynosure]

In my current work I have a process flow consisting of 20+ nodes. In each node an error from a service call must be redirected to a specific task node. 

This is the test process:

<process-definition xmlns="" name="TestGeneralExceptionHandling">
  | 	<exception-handler>
  | 		<!-- exception-class="...TestBackendException"> -->
  | 		<action name="action1"
  | 			class="....HandleBackendExceptionActionHandler">
  | 		</action>
  | 	</exception-handler>
  | 	<start-state name="start">
  | 		<transition name="" to="DoSomethingWrong"></transition>
  | 	</start-state>
  | 	<node name="DoSomethingWrong">
  | 		<event type="node-enter">
  | 			<action name="action1" class="...DoSomethingWrongActionHandler">
  | 			</action>
  | 		</event>
  | 		<transition name="" to="succes"></transition>
  | 	</node>
  | 	<task-node name="BackendError"></task-node>
  | 	<end-state name="succes"></end-state>
  | </process-definition>

In my code the exception handler performs the following lines of code:

public void execute(ExecutionContext executionContext) throws Exception {
  |             Node targetNode = executionContext.getProcessDefinition().getNode("BackendError");
  |             Token token = executionContext.getProcessInstance().getRootToken();
  |             executionContext.setVariable("BackendErrorOriginatingNode", token.getNode().getName());
  |             Transition errorTransition = new Transition("errorTransition");
  |             errorTransition.setTo(targetNode);
  |             token.signal(errorTransition);
  |     }
  | 

As you can see I construct the transition in the code which will be defined at runtime. This enables me to keep the process flow free of extra transitions from each node to be drawn.

I wonder if this is a robust way to handle exceptions. We then use a client application to view the backend error task node and perform corrective actions on backend systems. Then we will place the token back in the original node where the error occured and retry that node (all programatically).

Any comments?

Regards,

-- Yuri Vrancken

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