PMD - Java Source Code Scanner

PMD scans Java source code and looks for potential problems like Possible bugs ( empty try/catch/finally/switch statements ), Dead code (unused local variables, parameters and private methods) , Suboptimal code (wasteful String/StringBuffer usage), Overcomplicated expressions ( unnecessary if statements, for loops that could be while loops) and Duplicate code (copied/pasted code means copied/pasted bugs).

PMD is integrated with JDeveloper, Eclipse, JEdit, JBuilder, BlueJ, CodeGuide, NetBeans/Sun Java Studio Enterprise/Creator, IntelliJ IDEA, TextPad, Maven, Ant, Gel, JCreator, and Emacs.