Hello,

I'm using a fork to post different tasks to different actors. As a consequence, 
each of these tasks is related to a different token, and each oh these tokens 
is a child of the "original" token, the one which entered the fork node.
When 2 users validate their task at the same time, one of them gets a 
StaleObjectStateException, which mentions the parent token:
org.hibernate.StaleObjectStateException: Row was updated or deleted by another 
transaction (or unsaved-value mapping was incorrect): 
[org.jbpm.graph.exe.Token#581]

Here is a simplified example of my process:
<process-definition
  |   xmlns=""  name="ForkTest">
  |    <start-state name="start">
  |       <transition name="" to="fork1"></transition>
  |    </start-state>
  |    <fork name="fork1">
  |       <transition name="" to="task1"></transition>
  |       <transition name="tr2" to="task2"></transition>
  |    </fork>
  |    <task-node name="task1">
  |       <!-- ... -->
  |       <transition name="" to="end1"></transition>
  |    </task-node>
  |    <task-node name="task2">
  |       <!-- ... -->
  |       <transition name="" to="end2"></transition>
  |    </task-node>
  |    <end-state name="end1"></end-state>
  |    <end-state name="end2"></end-state>
  | </process-definition>

As I understand it, the termination of a Token notifies its parent in order for 
it to be able to terminate itself if all its children are finished.
What I can't figure out is why the parent token is modified when one of its 
children, (which is not the last) comes to an end ? I would have thought that 
only the termination of the last child token would modify the parent token, so 
I don't understand why the exception occurs, since there should not be any 
concurrent omdification of the parent token.

Any idea ? Is this behaviour normal ? Is there a way to manage this kind of 
problem without asking the user to re-validate his task ?

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