Re: [Jython-users] Newbie problem with applets

[Syver E. <syv...@on...>]

James Sleeman <bit...@ph...> writes:

> Hi all,
> firstly, I'm a newbie to both jython and pretty much to java in
> general (I've done a couple jobs in java, but nothing to write home
> about),

I can recommend you get New Riders jython book. It goes through why
things like this happens really thoroughly and has been a lot of help to
me, in clearing these kinds of problems and understanding why they happen.

Of the top of my head I can suggest, compiling your applet with the
--jar --core --deep options. Your .py file must have the same name as
your class, and watch out for the message from jythonc that your
python class is extending the java class, JApplet in your case. If
jythonc doesn't say this you got something wrong, imports or classpath
problems maybe. It's good to remember that jythonc compilation is nothing
like ordinary java compilation so don't count on really basic errors
being flagged just because it compiles.

Be aware that you can specify more than one jar file in your applet
tag.

Like this: archive="jarnumberone.jar , jarnumbertwo.jar"

This way you don't have to put all the files into the same jar. Alas I
have heard that this doesn't work with all browsers. It works on IE
6.0 which is what I have tested with.



> so my problem  might just be something I'm doing wrong. 

Probably yes. 

The class cast exception in your traceback indicates that your jython
class doesn't extend the class you think it extends see above.

Hope this helps.
-- 

Vennlig hilsen 

Syver Enstad