Cannot find activity in ProcessDefinition

[kikyou1986]

Hi,

I want to find a certain activity in a ProcessDefinitionImpl object using method #findActivity(activityId), but it returns null every time.

Below is the process picture. It is a simple Manager approval process. the applicant fills the application form first, then the manager approves it or reject it (send a message event which is caught by the boundary event handler).
I am aware that there is more sensible way to accomplish my purpose. However, I'm just using this way to do some study about activiti.
[IMG]http://i1066.photobucket.com/albums/u420/kikyou1986/rejectionTest_zps6ottqrra.png[/IMG]

Then, the main part of the bpmn.xml

<!– message that asking for transition –>
   <message id="transitionMsg" name="transitionMsg"></message>
   
   <process id="rejectionTest" isExecutable="true">
      <!– start event –>
      <startEvent id="sid-3CB181D7-6454-4191-8C64-6913830F0080"></startEvent>
      <!– fill the form –>
      <userTask id="formDocumentation" name="Form documentation"></userTask>
      
      <!– sub process for manager approval –>
      <subProcess id="subProcess" name="subProcess">
         <startEvent id="sid-F8C6AEE8-38BD-4756-97B4-B3F41D1C9888"></startEvent>
         <userTask id="managerApproval" name="Manager approval"></userTask>
         <endEvent id="sid-BD446E60-3C91-4F92-88DB-FC52B65CF0C0"></endEvent>
         <sequenceFlow id="sid-4D793033-8D63-4719-B21F-B749E86ED395"
            sourceRef="sid-F8C6AEE8-38BD-4756-97B4-B3F41D1C9888" targetRef="managerApproval"></sequenceFlow>
         <sequenceFlow id="sid-1305E9CA-3531-49AC-9AB3-6369FD898CE3"
            sourceRef="managerApproval" targetRef="sid-BD446E60-3C91-4F92-88DB-FC52B65CF0C0"></sequenceFlow>
      </subProcess>
      <endEvent id="sid-36FFF592-1898-4D99-8697-29B61CBA76EF"></endEvent>
      
      <!– boundary event –>
      <boundaryEvent id="sid-F1583981-7F79-4242-B396-9FAE066D8B56"
         attachedToRef="subProcess" cancelActivity="true">
         <messageEventDefinition messageRef="transitionMsg"></messageEventDefinition>
      </boundaryEvent>
      
      <!– transition handler –>
      <serviceTask id="sid-BDD36229-21A6-4D6A-A639-58EDADC29D4C"
         activiti:delegateExpression="${transitionHandleTask}"></serviceTask>
      <endEvent id="sid-A5BEB0D2-B629-4333-AE47-32AB08817F86"></endEvent>
      
      <sequenceFlow id="sid-1CF9CD35-52CB-457C-97C1-0BC8393D391C"
         sourceRef="subProcess" targetRef="sid-36FFF592-1898-4D99-8697-29B61CBA76EF"></sequenceFlow>      
      <sequenceFlow id="sid-71B6C7DC-52B7-4553-84B0-470CD0319562"
         sourceRef="sid-3CB181D7-6454-4191-8C64-6913830F0080" targetRef="formDocumentation"></sequenceFlow>
      <sequenceFlow id="sid-D6C9CE38-D763-4BEC-8EB0-22862957235D"
         sourceRef="formDocumentation" targetRef="subProcess"></sequenceFlow>
      <sequenceFlow id="sid-BBFCA741-55EC-4BB1-BAE9-12131512CC3F"
         sourceRef="sid-F1583981-7F79-4242-B396-9FAE066D8B56" targetRef="sid-BDD36229-21A6-4D6A-A639-58EDADC29D4C"></sequenceFlow>
      <sequenceFlow id="sid-EDEC210F-7292-4BA3-ACD8-15238DC4A7C9"
         sourceRef="sid-BDD36229-21A6-4D6A-A639-58EDADC29D4C" targetRef="sid-A5BEB0D2-B629-4333-AE47-32AB08817F86"></sequenceFlow>
   </process>
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Below is the main part of TransitionHandleTask which is an implementation of ActivityBehavior using as the ServiceTask.

/**
    * handle Task Jump
    * 
    * @param execution
    */
   private void handleJump(ActivityExecution execution) {

      String activityId = execution.getVariable("toActivity_").toString();
      String processDefinitionId = execution.getProcessDefinitionId();
      ProcessDefinitionImpl pd = (ProcessDefinitionImpl) repositoryService
            .createProcessDefinitionQuery()
            .processDefinitionId(processDefinitionId).singleResult();
      // the destination activity
      ActivityImpl pointActivity = pd.findActivity(activityId);
      // the current activity
      ActivityImpl currActivity = (ActivityImpl) execution.getActivity();
      // build a temporary outgoing transition for current activity
      PvmTransition tempTransition = (currActivity)
            .createOutgoingTransition();
      ((TransitionImpl) tempTransition).setDestination(pointActivity);
      // take the transition
      execution.take(tempTransition);
      // remove the temporary transition
      pointActivity.getIncomingTransitions().remove(tempTransition);
      currActivity.getOutgoingTransitions().remove(tempTransition);
   }
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I traced down the code. Everytime I get a null pointActivity. the activity id I used is `formDocumentation` matching the first activity in the xml. I also found in the ProcessDefinitionImpl object, the activity map(list) properties like activities and namedActivities are all empty map(list). Am I doing anything wrong here? Any help would be appriciated!

[jbarrez]

Try using the method on the repositoryService.getBpmnModel() to get the BpmnModel, which you can then use to get information about your activity

[kikyou1986]

Hi jbarrez, how can I get the ActivityImpl ojbect with certain activityId from the BpmnModel object?

[kikyou1986]

ok. I solved this by getting ProcessDefinitionImpl object with the following code:
<java>
ProcessDefinitionImpl pd = (ProcessDefinitionImpl) ((RepositoryServiceImpl) repositoryService)
    .getDeployedProcessDefinition(processDefinitionId);
</java>
This ProcessDefinitionImpl object will have all activity infomation in it.

I reckon that with the former approach, it is designed to have no activity infomation in it. The former approach I was using is:
<java>
ProcessDefinitionImpl pd = (ProcessDefinitionImpl) repositoryService
   .createProcessDefinitionQuery()
   .processDefinitionId(processDefinitionId).singleResult();
</java>

[jbarrez]

Correct.  RepositoryService.getProcessDefinition() would do the same, and does not need the cast.