JBoss - jBPM help required

[Rohit Rai]

Hello,

I have been looking to integrate the jBPM engine into a sample web based application. For this after a process is deployed i have written a method to signal that will signal a transistion. As i am very new to JBPM and did not get a lot of references in the web regarding how to go about it. Could anyone possibly comment on the following piece of code.

This method will return a map that will have a key value pair like:
{WIP=PM,DM,GPM}

Here key is : WIP (WorkInProgress)
PM,DM,GPM : Roles who have access to that state WIP

   
	public Map signalProcess(String processDefinitionName, long processInstanceId, String userRole) {
		JbpmContext jbpmContext = jbpmConfiguration.createJbpmContext();
			try {
				long processId = processInstanceId;
				ProcessInstance instance = jbpmContext.loadProcessInstance(processId);
				if(!instance.hasEnded())					                                                                 instance.signal();
				
				String node = instance.getRootToken().getNode().getName();
				Map stateUserMap = new HashMap();
				try {
					ExecutionContext ec = new ExecutionContext(instance.getRootToken());

					TaskNode   taskNode = (TaskNode) ec.getNode();
					//get the task set - iteratr and get each task and get the actor 
                                                                                //associated with the task

					Collection taskInstances = instance.getTaskMgmtInstance().getTaskInstances();
					Iterator taskItr = taskInstances.iterator();
					Set taskSet = taskNode.getTasks();
					String assignedActorId="";
					Iterator taskSetItr = taskSet.iterator();
					while(taskSetItr.hasNext())
						{						
							Task currentTask = (Task)taskSetItr.next();
							//Assuming that we have one current task
							while(taskItr.hasNext())
								{
									TaskInstance taskInstance = (TaskInstance) taskItr.next();								
									assignedActorId = taskInstance.getActorId();	
									if(currentTask!=null && currentTask.getName().equalsIgnoreCase(taskInstance.getName()))
										{
											stateUserMap.put(node,assignedActorId);
										}
								}
						}
				} catch (RuntimeException e) {
					System.out.println("Already Ended");
					stateUserMap.put(node,null);
					return stateUserMap;
				}
				return stateUserMap;				
			}
			catch(Exception e)
			{
				e.printStackTrace();
				return null;
			}
			finally {
				jbpmContext.close();
			}
		}

      

The processdefinition.xml file is as shown below:

<?xml version="1.0" encoding="UTF-8"?>

<process-definition  xmlns="urn:jbpm.org:jpdl-3.2"  name="DTSWorkflow">


  <start-state name="New">
    <transition to="Assigned" name="toMyAssigned"></transition>
  </start-state>


  <task-node name="Assigned">
    <task name="AssignUser">
      <assignment actor-id="PM"></assignment>
    </task>
    <transition to="WIP" name="toWIP"></transition>
    <transition to="toMoreInfo" name="to MoreInfo"></transition>
  </task-node>

  <task-node name="WIP">
    <task name="WIPComments">
      <assignment actor-id="PM,DM,GPM"></assignment>
    </task>
    <transition to="Completed" name="toCompleted"></transition>
  </task-node>

  <task-node name="toMoreInfo">
    <task name="MoreInfoComments">
      <assignment actor-id="TM,TL"></assignment>
    </task>
    <transition to="WIP" name="toWorkInProgress"></transition>
  </task-node>

  <task-node name="Completed">
    <task name="CompletedComments">
      <assignment actor-id="GPM"></assignment>
    </task>
    <transition to="Verify" name="toVerify"></transition>
  </task-node>

  <task-node name="Verify">
    <task name="VerifyComments">
      <assignment actor-id="DM"></assignment>
    </task> 
    <transition to="Closed" name="toClosed"></transition>
  </task-node>


  <end-state name="Closed"></end-state>


</process-definition>
       

Thanks in advance for any pointers,