[jboss-user] [JBoss Seam] - Injecting Business Process context scoped variables

[mgombocz]

Hi,

I've defined a workflow that is started by a method called "receive(...)" (annotated with @CreateProcess). In this method I outject a variable named "workEffortId" into the Business Process context.

My jPDL is rather short (start-node -> transition -> task-node -> transition -> end-node).

In the 1st transition I have defined an action expression which calls a method called "assignToTimeSheet". In this method I inject variable "workEffortId" (Business Process context), but it is always null!

If I call "assignToTimeSheet" in the 2nd transition, "workEffortId" gets the value that was outjected in "receive(...)".

So, my assumption is that, because jBPM performs a transaction commit at the 1st wait-state (in this example at the task-node) and "assignToTimeSheet" is called before, Seam tries to read data that have not been committed yet, which results to a null value.

Alternatively using an async node is not yet supported by Seam (see http://jira.jboss.com/jira/browse/JBSEAM-161).

Does anybody has an idea how to solve this?

Thx,
Manuel

PS. See my example code below (excerpts).

Workflow "receiveWorkEffort"

  | <?xml version="1.0"?>
  | <process-definition name="receiveWorkEffort">
  | 
  |     <start-state name="start">
  |         <transition to="enter">
  | 	<action expression="#{workEffortReception.assignToTimeSheet}" />
  |         </transition>
  |     </start-state>
  |     
  |     <task-node name="enter" end-tasks="true">
  |         <task name="enterDocumentation">
  | 	<assignment actor-id="#{processInstance.contextInstance.variables['actorId']}"/>
  |         </task>
  |         <transition name="done" to="complete" />
  |     </task-node>
  | 
  |     <end-state name="complete"/>
  | </process-definition>
  | 

Methods "receive" and "assignToTimeSheet":

  | @Stateless
  | @Name("workEffortRecipient")
  | public class WorkEffortRecipientBean implements WorkEffortRecipient,
  | 		Serializable {
  | 
  | 	// ... ...
  | 
  | 	@In
  | 	private EntityManager entityManager;
  | 
  | 	@In(scope = ScopeType.BUSINESS_PROCESS, required = false)
  | 	@Out(scope = ScopeType.BUSINESS_PROCESS, required = false)
  | 	private Long workEffortId;
  | 
  | 	// ... ...
  | 
  | 
  | 	@CreateProcess(definition = "receiveWorkEffort")
  | 	public void receive(WorkEffortDTO effortDTO) {
  | 
  | 		// ... ...
  | 		workEffortId = workEffort.getId();
  | 		// ... ...
  | 	}
  | 
  | 	public void assignToTimeSheet() {
  | 		// workEffortId is always null if called in the 1st transition
  | 		if (workEffortId != null) {
  | 			// ... ...
  | 		}
  | 	}
  | }
  | [/url]

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