pmd/docs/index.md

title	keywords	tags	permalink	toc	summary	last_updated
PMD Introduction	java	getting_started	index.html	false	Welcome to PMD, an extensible cross-language static code analyzer. It finds common programming flaws like unused variables, empty catch blocks, unnecessary object creation, and so forth. Additionally it includes CPD, the copy-paste-detector. CPD finds duplicated code.	August 2017

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PMD scans source code in Java and other languages 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

CPD, the copy-pase-detector, finds duplicated code in many languages:

• Duplicate code is often just copied and pasted. This means, the bugs are also copied and pasted. Fixing them means, fix all duplicated code locations.

Features

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### PMD

Features:

• Supporting 8 languages
• Many ready-to-use built-in rules.
• Custom rules can be written in Java
• Custom rules can be written using XPath expression that query the AST of the sources
• Many output formats
• Many integrations into IDEs, build tools

Supported Languages:

• Java
• JavaScript
• Salesforce.com Apex and Visualforce
• PLSQL
• Apache Velocity
• XML and Maven POM
• XSL

### CPD

Features:

• Supporting 19 languages
• Simple GUI
• Fast
• Many integrations

Supported Languages:

• Java
• C, C++
• C#
• Groovy
• PHP
• Ruby
• Fortran
• JavaScript
• PLSQL
• Apache Velocity
• Scala
• Objective C
• Matlab
• Python
• Go
• Swift
• Salesforce.com Apex and Visualforce

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• Release Notes
• Download

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