pmd.xml

<?xml version="1.0"?>
<ruleset name="custom-ruleset">
  <description>Custom set of preferred, sane rules</description>
  <!-- This ruleset excludes things already covered by checkstyle. -->

  <rule ref="rulesets/java/design.xml">
    <!-- This ignores any explanation in the Javadoc. Bad. -->
    <exclude name="UncommentedEmptyConstructor"/>
    <!-- I disagree. -->
    <exclude name="ConfusingTernary"/>
    <!-- Complains about enums. I know what I'm doing so it's always wrong. -->
    <exclude name="CompareObjectsWithEquals"/>
    <!-- Maintainability is more important than a particular JVM's quirks. -->
    <exclude name="TooFewBranchesForASwitchStatement"/>
    <!-- Interacts poorly with Lombok and JCommander, but could be useful. -->
    <exclude name="ImmutableField"/>
  </rule>
  <rule ref="rulesets/java/basic.xml"/>
  <rule ref="rulesets/java/clone.xml"/>
  <rule ref="rulesets/java/empty.xml"/>
  <rule ref="rulesets/java/finalizers.xml"/>
  <rule ref="rulesets/java/sunsecure.xml"/>
  <rule ref="rulesets/java/strictexception.xml"/>
  <rule ref="rulesets/java/strings.xml"/>
  <rule ref="rulesets/java/typeresolution.xml"/>
  <rule ref="rulesets/java/unnecessary.xml">
    <!-- Ignores readability concerns. Very bad.-->
    <exclude name="UselessParentheses"/>
  </rule>
  <rule ref="rulesets/java/unusedcode.xml"/>
</ruleset>