How to protect java application

Hello all,
Could you give me some clues on how to protect a java application?
By license keys ? how to protect application by license keys? I am not sure about Signing JAR Files, is it what I need?
Any better way than using license keys to protect a java application?
Thanks.

>
Could you give me some clues on how to protect a java application?
>
You might want to look into obfuscators. They won't stop decompiling but they can make it hard to understand the decompiled code.
Proguard has a good reputation
http://proguard.sourceforge.net/
>
ProGuard is a free Java class file shrinker, optimizer, obfuscator, and preverifier. It detects and removes unused classes, fields, methods, and attributes. It optimizes bytecode and removes unused instructions. It renames the remaining classes, fields, and methods using short meaningless names. Finally, it preverifies the processed code for Java 6 or for Java Micro Edition.

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How to protect java application

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