Applet NullPointerException

hi,

i would like to start an applet on my web server(Debian,apache2) with html.
The following error occurs:

java.lang.NullPointerException
at sun.plugin2.applet.Plugin2Manager.findAppletJDKLev el(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unk nown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionR unnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Ausnahme: java.lang.NullPointerException

Strangely the same applet works on a windows pc with apache2. There is no difference.

Can it be the code?
Or is it something with permissions?

I more or less solved the problem. I am not sure if it was a bug in the java runtime or another sort of problem. However a update of the jre solved the problem.

Now I have another problem. There are NoClassDefFound Errors although i added the .jar files in the Applet Tag correctly.

The applet works on the XP-Apache2-Server.
I dont know what to do.

Thanks

I sometimes get the same error but when I run the applet again, then the jar loads