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.java:sonar-pmd-plugin:2.3'
<dependency>
<groupId>org.codehaus.sonar-plugins.java</groupId>
<artifactId>sonar-pmd-plugin</artifactId>
<version>2.3</version>
</dependency>
<dependency org="org.codehaus.sonar-plugins.java" name="sonar-pmd-plugin" rev="2.3"/>
"org.codehaus.sonar-plugins.java", "sonar-pmd-plugin", "2.3"