Re: [Jython-users] Exception propagation

[<bc...@wo...>]

[Sebastien Delafond]

>Hi,
>
>I have a very dummy Jython script, except.py, that does :
>
>except.py :
>1: import java.lang.Exception
>2: raise java.lang.Exception
>
>I then compile this to a standalone jar (jythonc --core --jar except.jar
>except.py), that I call from another Java class; the call itself looks like
>:
>
>try {
>  String jar = "./except.jar";
>  URLClassLoader theLoader = new URLClassLoader(new URL[] { new URL("file:"
>+ jar)});
>  Object theLoadedClass = Class.forName("except", true,
>theLoader).newInstance();
>  String[] array = new String[] {};
>  Method main = theLoadedClass.getClass().
>  getMethod("main", new Class[] { array.getClass() });
>  main.invoke(theLoadedClass, new Object[] {new String[] {}});
>}
>catch (Throwable t) {
>  t.printStackTrace();
>}

[A sidenote: when using the URLClassLoader I can't find the
except$_PyInner class. I'll add a bugreport about that.]

>The problem is that my "catch" actually doesn't catch the Exception I'm
>throwing/raising from the jython script.

It is because of the catch in Py.runMain(..):

> http://cvs.sourceforge.net/cgi-bin/viewcvs.cgi/jython/jython/org/python/core/Py.java?annotate=2.53#824

>...
>
>Thanks for any input, since I seem to be missing something obvious : I just
>would like to be able to catch the exceptions raised from the python script,
>in the java caller. I'm sure that's doable :)

Not at the moment. I'll submit a bugreport.

regards,
finn