How can I protect my classes from de-compilers?

Is there a way to protect my *.class files from de-compilers such as "decafe pro"????
is there somewhere a good code-obfuscator?

Why would you want to?
Obfuscators won't do anything other than slow down those who want to decompile your class. And annoy them. And make debugging difficult.
Perhaps you should re-evaluate your reasons, and if you still think you have a good reasons, then use some language other than Java. I would certainly never want to work with your code, even though I've never decompiled a class except to see how it is done.
If you still want to prevent decompiling, write all of your code in JNI. Sure, it's not portable, but what difference would that make.

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