PMD

PMD is an extensible multilanguage static code analyzer. It finds common programming flaws like unused variables, empty catch blocks, unnecessary object creation, and so forth. It's mainly concerned with Java and Apex , but supports 16 other languages . It comes with 400+ built-in rules . It can be extended with custom rules. It uses JavaCC and Antlr to parse source files into abstract syntax trees (AST) and runs rules against them to find violations. Rules can be written in Java or using a XPath query. Currently, PMD supports Java, JavaScript, Salesforce.com Apex and Visualforce, Kotlin, Swift, Modelica, PL/SQL, Apache Velocity, JSP, WSDL, Maven POM, HTML, XML and XSL. Scala is supported, but there are currently no Scala rules available. Additionally, it includes CPD , the copy-paste-detector. CPD finds duplicated code in Coco, C/C++, C , CSS, Dart, Fortran, Gherkin, Go, Groovy, HTML, Java, JavaScript, JSP, Julia, Kotlin, Lua, Matlab, Modelica, Objective-C, Perl, PHP, PL/SQL, Python, Ruby, Salesforce.com Apex and Visualforce, Scala, Swift, T-SQL, Typescript, Apache Velocity, WSDL, XML and XSL. Download the latest binary zip from the releases and extract it somewhere. There are plugins for Maven and Gradle as well as for various IDEs. See Tools / Integrations Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change. The rule designer is developed over at pmd/pmd-designer. Please see its README for developer documentation.