How to add my class into rt.jar file?

Hi, everyone!
I am using WinRAR to extract the package rt.jar and added
my class file to javax folder. Then I use jar c0vf to create
a package. After that, I restart my WSAD4.0.2. But it seems
that WSAD4.0.2 can not be started. (It stops at the welcome
screen for a long time.)
Anything wrong I have made? How to resolved the reouble?
Cheers,
George Ma

Thanks!
Do you know how to add .class file to a project of WSAD4.0.2?
I use CLASSPATH, but always failed in IDE. But it works in
command line environment. I want to use some classes in a
.class file.
Can you help?
Cheers,
George

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