Tools to improve code quality

A list of free/open-source tools that I am currently using (as part of the nightly build process) to check/improve the source code quality:

• PMD (sourcecode analysis)
• FindBugs (bytecode analysis)
• EMMA (code coverage)
• DocCheckDoclet (Javadoc syntax check)
• Copy/Paste Detector (duplicate code finder)

Currently evaluating:

• Lint4J (bytecode analysis)
• CheckStyle (coding standards check)
• JavaNCSS (sourcecode metrics)
• JDepend (sourcecode metrics)
• Milk (source code security scanner)
• Classycle (Dependency checker)

Read more at Automation for the people.

See also the following tools collections:

• http://samate.nist.gov/index.php/Source_Code_Security_Analyzers
• http://en.wikipedia.org/wiki/List_of_tools_for_static_code_analysis
• http://java-source.net/open-source/code-analyzers