PMD is a tool that looks for potential problems like possible bugs, dead code, suboptimal code, overcomplicated expressions or duplicate code.
'org.codehaus.sonar.plugins:sonar-pmd-plugin:3.1-RC1'
<dependency>
<groupId>org.codehaus.sonar.plugins</groupId>
<artifactId>sonar-pmd-plugin</artifactId>
<version>3.1-RC1</version>
</dependency>
<dependency org="org.codehaus.sonar.plugins" name="sonar-pmd-plugin" rev="3.1-RC1"/>
"org.codehaus.sonar.plugins", "sonar-pmd-plugin", "3.1-RC1"