I’ve been working with JEPP this morning. A co-worker, Joe Grant, recommended it to me for cases where we have a need to run some of our Python based tools from Java. It turns out that it works pretty well and I think it may help us out with a few things at work. One thing that I was pleased to find came from this example:

dualmini:~/Work/jep-2.2 corbinbs$ cat test2.py
class Twig(Exception):
    pass

x = 1

if x == 1:
    raise Twig("I'm a pretty error message!")

dualmini:~/Work/jep-2.2 corbinbs$
dualmini:~/Work/jep-2.2 corbinbs$ java -jar jep.jar test2.py
jep.JepException: : I'm a pretty error message!
at jep.Jep.run(Native Method)
at jep.Jep.runScript(Jep.java:191)
at jep.Jep.runScript(Jep.java:167)
at jep.Run.run(Run.java:58)
at jep.Run.main(Run.java:153)
dualmini:~/Work/jep-2.2 corbinbs$

So, it looks like CPython exceptions bubble back up quite nicely. This will likely help us improve some of our error handling/reporting in cases where we’ve got Java tools/apps calling out to some of our Python tools. JEPP is definitely worthy of the “Rock The Fat Knot” stamp of approval.