ProGuard : Java Glossary

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ProGuard
ProGuard is a free Java class file shrinker, optimizer, and obfuscator. It can detect and remove unused classes, fields, methods, and attributes. It can then optimize bytecode and remove unused instructions. Finally, it can rename the remaining classes, fields, and methods using short meaningless names. The resulting jars are smaller and harder to reverse-engineer.

Sometimes you don’t want that. I have not yet experimented to see if what it does confuses JET native compilation of the jar.

Its secondary use is chasing dependencies and making sure you have all the *.class files you need for a jar and no more.

dependencies
JET
obfuscator
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