PMD, Checkstyle, and FindBugs are audit-as-you-go ReSharperesque tools for the Java space that check code quality.

I think they will squawk if you nest switch/case statements eight levels deep inside of each other and that sort of thing. I'm not sure what PMD stands for. Links:

• https://pmd.github.io/
• http://checkstyle.sourceforge.net/
• http://findbugs.sourceforge.net/