[java] Best Java obfuscator?

I am developing a security software and want to obfuscate my java code so it will become impossible to reverse engineer. What is the most reliable java obfuscator ?

As said elsewhere on here, proguard is good, but what might not be known is that there is also a third-party maven plugin for it here http://pyx4me.com/pyx4me-maven-plugins/proguard-maven-plugin/...I've used them both together and they're very good.

If a computer can run it, a suitably motivated human can reverse-engineer it.

I used to work with Klassmaster in my previous company and it works really well and can integrate pretty good with build systems (maven support is excellent). But it's not free though.

I used Allatori and it did its job pretty well.

Check out my article Protect Your Java Code - Through Obfuscators And Beyond [Archived] for a discussion of obfuscation vs three other ways to make the reverse engineering of your apps more expensive, and a collection of links to tools and further reading materials.

We've had much better luck encrypting the jars rather than obfuscating. We use Classguard.

I don't know for sure if the solution is safe, but about the ClassGuard solution, it's interesting to read the article and the comment at: http://www.javaworld.com/community/?q=node/1604#comment-12296

It is true that it is always possible to reverse engineer some code, just like it is impossible to protect a house in order so nobody can ever steal from it. That does not keep me from locking the door, though. Actually, I am not in the java world, I use BitHelmet for .net.

I think that Proguard is the best. It is also possible to integrate it with your IDE (for example NetBeans). However, consider that if you obfuscate your code it could be difficult to track problems in your logs..