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. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3978054#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...