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JCSC is a highly configurable checking tool for your Java source code. It checks the compliance to a defineable coding standard like naming conventions and code structure. Also signs of bad coding, potential bugs are found. JCSC is inspired by lint.
Transmogrify is a code analysis/manipulation tool for Java whose current focus is refactoring. There are also the beginnings of a lint tool and a code twiddler (makes changes to code that aren't refactorings).