Hi,
Java applets (as opposed to Java Server Pages) are purely dependant on the client and as such, do not require any Java handling capabilities on the Server (outside of having the correct path details etc.)
I'd suggest checking what, if any, error messages are displayed in your web browser when trying to access the page. Some browsers offer limited Java logging which may provide some clues.
As for JSP stuff... Sorry, I can't help you.
Regards,
Luke