Create timer problem coming from completed task

[iterrell]

I'm experimenting with jBPM before integrating it into my application, and I've run into a small snag.

My original process went like this:

<process-definition name="myProcess">
 <swimlane name="myLane">
 <assignment class="com.example.MyAssignmentHandler" />
 </swimlane>
 <start-state name="start">
 <transition name="go" to="call" />
 </start-state>
 <state name="call">
 <transition name="go" to="wait" />
 <transition name="done" to="end" />
 </state>
 <state name="wait">
 <timer duedate="10 seconds" transition="go" />
 <transition name="go" to="fax" />
 </state>
 <state name="fax">
 <transition name="go" to="end" />
 </state>
 <end-state name="end" />
</process-definition>

And it worked fine. Advancing from "call" went to "wait," and 10 seconds later it went to "fax." But, I wanted to make call a task-node that would advance after the task was done. So I changed the state "call" to

 <task-node name="call">
 <task name="phonecall" swimlane="myLane" />
 <transition name="go" to="wait" />
 <transition name="done" to="end" />
 </task-node>

After the completion of the task the process successfully moved to the state "wait." However, it does not create a timer upon entry, and thus does not automatically advance to "fax."

I noticed from the log that despite not creating the timer, it was at least firing the event "node-enter" on "wait," so I replaced the state "wait" with the following

 <state name="wait">
 <transition name="go" to="fax" />
 <event type="node-enter">
 <create-timer duedate="10 seconds" transition="go" />
 </event>
 </state>

Now the event is being executed, as seen in the log

DEBUG [GraphElement] executing action 'CreateTimerAction(...)'

however, the SchedulerThread is not finding the timer.

I'm developing a simple web application using the SchedulerServlet and the service jbpm.sar provided in the 3.0.2 starter kit, and using servlets to interact with jBPM.

My task servlet looks like:

package ...;
import ...;

public class DoTask extends HttpServlet {

 @Override
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

 String action = (String)request.getParameter("action");
 long id = Long.parseLong(request.getParameter("id"));

 JbpmSessionFactory jbpmSessionFactory = JbpmSessionFactory.getInstance();
 JbpmSession jbpmSession = jbpmSessionFactory.openJbpmSession();
 jbpmSession.beginTransaction();

 TaskInstance task = jbpmSession.getTaskMgmtSession().loadTaskInstance(id);

 if ("called".equals(action))
 task.end("go");
 else if ("paid".equals(action))
 task.end("done");

 jbpmSession.commitTransaction();
 jbpmSession.close();

 request.getRequestDispatcher("/index.html").forward(request,response);
 }
}

Any ideas why my timer isn't getting created, or at least, not found?

Is the SchedulerServlet the best place for a scheduler in a full blown J2EE application with all of the business (and thus jBPM) logic in Session EJBs?

Thanks for your help,
Ian

[iterrell]

More info (whoops!):

If I advance from "call" directly with a processInstance.signal("go"), the timer is created and found and works properly.

[iterrell]

Anyone able to offer any insight on this problem? :)

[iterrell]

Nevermind, fixed it! The answer is very simple. Turns out that after doing a task you have to explicitly save the process instance, like so:

jbpmSession.getGraphSession().saveProcessInstance(task.getTaskMgmtInstance().getProcessInstance());