[Jython-users] exceptions and inheritance

[Richard G. <rg...@in...>]

Hi,

If I define a Java 2 exceptions classes with one being a subclass of the
other:

public class BaseException extends Exception
{ ... }

public class DerivedException extends BaseException
{ ... }

And if the DerivedException is raised in a Java program, I can catch it
in Jython as a DerivedException but *not* as a BaseException, i.e the
following code:

try:
    # call the java prog that raises a DerivedException
except DerivedException, e:
    print "Got a DerivedException :", e

... will display "Got a DerivedException : ...." (which is OK)

whereas the code:

try:
    # call the java prog that raises a DerivedException
except BaseException, e:
    print "Got a BaseException :", e
else:
    import sys
     exc_type, exc_value, exc_traceback = sys.exc_info()
     print 'uncaught exception', exc_type, exc_value, exc_traceback

...will display "uncaught exception ..." instead of "Got a
BaseException..."

This looks abnormal to me!
Am I missing something or is it a bug ? Thanks for any clue.

Richard