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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, PLSQL, 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#, Dart, Fortran, Gherkin, Go, Groovy, HTML, Java, JavaScript, JSP, Julia, Kotlin, Lua, Matlab, Modelica, Objective-C, Perl, PHP, PLSQL, Python, Ruby, Salesforce.com Apex and Visualforce, Scala, Swift, T-SQL, Typescript, Apache Velocity, WSDL, XML and XSL.
https://pmd.github.io/
BSD-style
PMD
github contributors
concerned available rules source trees mainly empty apex plsql objective salesforce java apache finds find html catch written gherkin programming swift matlab visualforce using python static modelica like maven antlr violations query them includes forth javascript multilanguage groovy flaws files unused detector object other code scala against comes paste extended duplicated into dart xpath wsdl common julia analyzer fortran supports copy perl typescript extensible creation variables languages built blocks custom kotlin unnecessary parse abstract velocity javacc ruby with currently coco there additionally syntax uses runs supported
Files download
File Operation
pmd-7.4.0.pom download
Apache Maven 
<dependency>
  <groupId>net.sourceforge.pmd</groupId>
  <artifactId>pmd</artifactId>
  <version>7.4.0</version>
  <type>pom</type>
</dependency>
Gradle Groovy 
implementation 'net.sourceforge.pmd:pmd:7.4.0'
Gradle Kotlin 
implementation("net.sourceforge.pmd:pmd:7.4.0")
Scala SBT 
libraryDependencies += "net.sourceforge.pmd" % "pmd" % "7.4.0"
Groovy Grape 
@Grapes(
  @Grab(group='net.sourceforge.pmd', module='pmd', version='7.4.0')
)
Apache Ivy 
<dependency org="net.sourceforge.pmd" name="pmd" rev="7.4.0" />
Leiningen 
[net.sourceforge.pmd/pmd "7.4.0"]
Apache Buildr 
'net.sourceforge.pmd:pmd:jar:7.4.0'
Dependencies
The project has no third-party dependencies