PMD (software)

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PMD is a static ruleset based Java source code analyzer that identifies potential problems like:

Possible bugs - Empty try/catch/finally/switch blocks.
Dead code - Unused local variables, parameters and private methods
Empty if/while statements
Overcomplicated expressions - Unnecessary if statements, for loops that could be while loops
Suboptimal code - wasteful String/StringBuffer usage
Classes with high Cyclomatic Complexity measurements.
Duplicate code - Copied/pasted code can mean copied/pasted bugs, and decreases maintainability.

While PMD doesn't officially stand for anything, it has several unofficial names, the most appropriate probably being Programming Mistake Detector.

Typically, PMD errors are not true errors, but rather inefficient code, i.e. the application could still function properly even if they were not corrected.

1 Rulesets
2 Copy/Paste Detector (CPD)
3 Plugins
4 External links

[edit] Rulesets

PMD includes a set of builtin rules and supports the ability to write custom rules.

[edit] Copy/Paste Detector (CPD)

The Copy/Paste Detector (CPD) is an add-on to PMD that uses the Karp-Rabin string matching algorithm to find duplicated code. CPD works with Java, C, C++, and PHP code.