Get exception message of python in java

[OptimusV5]

I have an java interface which is implemented in python, and I call the python function in a java program. I am trying to catch the exceptions that python code throw in my java program. I've tried the JavaException class, but makes no sense.
So, how can i get the python exception info in java?

[Julian-O]

Duplicate of #623 which is to document how to do this.