PMD

En maven

<reporting>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-pmd-plugin</artifactId>
            <version>2.7.1</version>
            <configuration>
                <linkXRef>false</linkXRef>
                <targetJdk>1.6</targetJdk>
                <rulesets>
                    <ruleset>/rulesets/basic.xml</ruleset>
                </rulesets>
            </configuration>
        </plugin>
    </plugins>
</reporting>

Ejecutar

mvn clean install pmd:pmd