tools/rules-pmd.xml

<?xml version="1.0"?>
<ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
    xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 http://pmd.sourceforge.net/ruleset_2_0_0.xsd">

    <rule ref="rulesets/java/basic.xml" />

    <rule ref="rulesets/java/braces.xml" />

    <rule ref="rulesets/java/strings.xml" />

    <rule ref="rulesets/java/design.xml" />

    <rule ref="rulesets/java/unusedcode.xml" />

</ruleset>