[Jython-users] Exception propagation

[Sebastien D. <sde...@ve...>]

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();
}

The problem is that my "catch" actually doesn't catch the Exception I'm
throwing/raising from the jython script.
On the other hand, I believe my Java call to execute the jar is legal, since
if I do :

except.java :
1: import java.lang.Exception;
2: public class except {
3:    public static void main(String[] args) throws Exception {
4:       throw new Exception();
5:    }
6: }

and compile/jar that class into except.jar, then the exception is caught.

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 :)

--Sebastien


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