The Checker Framework is a library that enhances Java’s type system in order to detect and prevent errors in Java programs.
The Checker Framework is a library that enhances Java’s type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.
Homepage: http://checkerframework.org/