Re: [Jython-users] Using jython with jythonc-compiled classes?

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

[Danny Yoo]

>I've been experimenting with jythonc, and one of my experiments was to
>play around with Java interfaces.  In the course of my experiments, I've
>been running my head into a strange AttributeError.
>
>Since I'm not too familiar with Jython, I'll report the steps I've done in
>some detail; forgive me if much of this is extraneous!  

It is exactly the right amount of detail. Thank you for that.

>The error message
>is at the very bottom, and this message traces what I've done to get the
>message.
>
>I have the following Java interface:

[snipped a traditional use of jythonc which works]

>And this worked!
>
>However, I ran into problems when I tried playing with my classes in
>Jython.  To force Jython to use my jythonc-compiled classes, I made a new
>directory called "scratch".  Here's the log:
>
>...
>Jython 2.1a3 on java1.3.0_02 (JIT: null)
>Type "copyright", "credits" or "license" for more information.
>>>> import Doubler
>>>> Doubler
><jclass Doubler at 5868800>
>>>> d = Doubler()
>>>> d.eval(42)
>Traceback (innermost last):
>  File "<console>", line 1, in ?
>AttributeError: abstract method "eval" not implemented
>###
>
>I'm just scratching my head on this one.  Are Jythonc-compiled classes
>reusable from Jython itself?  

Short answer: no.

It is because "Doubler" is partly a java class and partly a python
module. To see Doubler function as a python module you can use this
trick:

import Doubler
Doubler.moduleDictInit(Doubler.__dict__)
d = Doubler.Doubler()
print d.eval(42)


There is no trick to make Doubler appear as a java class. The code that
does that is located at the bottom half of Py.initProxy() and can't be
called directly.

regards,
finn