[jboss-user] [JBoss jBPM] - How to realize the fork node?

[ppxiaofei]

Hi, my buddieer
I want to add a fork node in my processdefinition, the code like this:
<process-definition xmlns="urn:jbpm.org:jpdl-3.1" name="simple">
  |    <swimlane name="beginner"></swimlane>
  |    <swimlane name="task1">
  |       <assignment expression="user(bohan)"></assignment>
  |    </swimlane>
  |    <swimlane name="task2">
  |       <assignment expression="user(filmkiller)"></assignment>
  |    </swimlane>
  |    <swimlane name="task3">
  |       <assignment expression="user(dsy)"></assignment>
  |    </swimlane>
  |    <start-state name="start">
  |      <task name="start" swimlane="beginner"></task>
  |       <transition name="to1" to="task1"></transition>
  |    </start-state>
  |    <task-node name="task1">
  |       <task name="task1" swimlane="task1"></task>
  |       <transition name="" to="fork1"></transition>
  |    </task-node>
  |    <fork name="fork1">
  |       <transition name="to2" to="task2"></transition>
  |       <transition name="to3" to="task3"></transition>
  |    </fork>
  |    <task-node name="task2">
  |       <task name="task1" swimlane="task2"></task>
  |       <transition name="" to="join1"></transition>
  |    </task-node>
  |    <task-node name="task3">
  |       <task name="task1" swimlane="task3"></task>
  |       <transition name="" to="join1"></transition>
  |    </task-node>
  | ...
  | 
  | </process-definition

But when the user in node task1 submit, I got the return message :
New tasks have been assigned to: null, null.

I want to know the reason, should I miss some code to realize the Fork node? thanks a lot

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