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Trouble running Java applet on Mac

I'm part of a team that's developing an applet that's supposed to run on
both Mac and Windows and hopefully other platforms as well. It is a Swing
RMI applet that's being developed in JBuilder on Windows 2000. The applet
runs fine on PCs running Windows but we've only managed to get one iMac with
MacOS 8.6 to run it! All attempts at other Macs fail with this error:

Class missing for error: java/lang/NoClassDefFoundError at
java.lang.ClassLoader.defineClass(ClassLoader.java)
An exception occurred:
java.lang.NoClassDefFoundError

We've been unable to find out what class definition is not being found.
Nothing should be special about the setup of the one iMac that runs the
applet!

All the Macs we've tried are running at least MacOS 8.5.1 and as far as we
know are running MRJ 2.2.4 and we've downloaded the Swingall.jar from
JavaSoft and have registered it in ClassPath through Internet Explorer.
Anything else that might be missing?

Has anyone else had this problem and know how to solve it? All attempts at
search engines lead up to the same page at apple.com that's for downloading
of the latest version of MRJ 2.2.4 and we don't fancy reading the entire
mailing list archives!

None of has much knowledge of Macs and we would appreciate any help.

--
Gunnlaugur Jonsson <mailto:email@hidden>



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