The problem is the ExceptionHandling, see 
http://docs.jboss.com/jbpm/v3/userguide/processmodelling.html#exceptionhandling

anonymous wrote : 
  | When an exception occurs in a delegation class, the process element parent 
hierarchy is serached for an appropriate exception-handler. When it is found, 
the actions of the exception-handler are executed
  | 

But if a Exception occurs in a SessionBean in a JavaEE Environment, the 
transaction (in which also jBPM is running) is marked for rollback. And now 
jBPM wants to search the parents. Then the posted Exception occurs, I think 
because of the transaction rollback marker.

So my opinion is, that the parents must be lazy loaded bevore the execute of 
the action of the GraphElement. Than this problem should be avoided.

Am I right?

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