We have similar issues with getting a null token using call
process.getRootToken(). It is fairly easy to achieve that:
* Define your own ActionHandler class. All it should do in execute(ctx) method,
is throw new java.lang.Exception("haha")
* Place this ActionHandler into jpdl
* Invoke state transition by calling process.getRootToken().signal()
That would be the last moment when you are able to access rootToken. Next time
process.getRootToken() will return NULL value.
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