[jboss-user] [JBoss jBPM] - Task Instances - How to mark as complete?

[CatlinIT]

A simple process definition of a couple of tasks:

            "<process-definition name='threeStep'>" +
  |             "  <start-state name='start'>" +
  |             "    <transition to='s1' />" +
  |             "  </start-state>" +
  |             "  <task-node name='s1'>" +
  |             "       <task name='t1'/>" +
  |             "       <transition to='s2' />" +
  |             "  </task-node>" +
  |             "  <task-node name='s2'>" +
  |             "       <task name='t2'/>" +
  |             "       <transition to='s3' />" +
  |             "  </task-node>" +
  |             "  <end-state name='s3' />" +
  |             "</process-definition>"
  | 
Create this as an instance and signal() to start.  Then, using the following gives the outstanding task instance t1

processInstance.getTaskMgmtInstance().getUnfinishedTasks(processInstance.getRootToken())
  | 
Use signal() to continue and then pauses at the next task, the line above now show t1 & t2 as unfinished.   How do you mark the first task as finished?   

I've tried by obtaining the task instance and using end() but this complains 
the task is already ended:

        Collection c = processInstance.getTaskMgmtInstance().getUnfinishedTasks(processInstance.getRootToken());
  |         for (Iterator i = c.iterator(); i.hasNext(); ) {
  |             TaskInstance ti = (TaskInstance) i.next();
  |             ti.setEnd(now);
  |             ti.end(); // Mark complete
  |         }
  | 


What is the correct way to interact with a task instance to ensure the state is set correctly before transitioning?

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