Linux, Java and Javax.usb

Hello,
I've spent 3 days trying to install the javax.usb package on my linux with the classical package and I finally found the javax.usb RPMs. I installed them and every thing seemed fine until I tried to run a java program.
Now I'm unable to run any program.
Completion does not work anymore e.g. when I'm in a directory with a .class file, the completion is unable to find it.
That would not be a real problem but when I try to run a java program, I always end up with a ClassNotFoundException. Does anyone have a clue about what is happening to me.
System : Mandriva 2009.0
Linux Kernel 2.6

Packages that begin with "java" are base packages.
Packages that begin with "javax" are extensions to
Java (hence the "x").
AWT was the first UI package in Java. Swing came
later and was added as an extension.
%aha, right. cheers

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