Thank you for your response. I agree with what you said. But we can add 
calling leaveNode in class Node, after calling ActionHandler. 
  The case I feel really unconvenient is when the ActionHandler is used by a 
node, and there is only one leaving transition, or we just want to go after the 
default transition. And I believe this is true for many cases.
  Moreover, it's a good idea that let the end-user write script for a node's 
action.  Currently, we must tell the end-user to call leaveNode after the very 
end, and setVariable to processVariable before leaveNode if she/he updated some 
of processsVariables; if she/he didn't do these, the process doesn't work.
 
  Of cause, I can add my node type to jBPM, and implement this in my node type.
  

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