allwpilib/styleguide/pmd-ruleset.xml

<?xml version="1.0"?>
<ruleset name="WPILibRuleset"
         xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         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/empty.xml" />
  <rule ref="rulesets/java/empty.xml/EmptyCatchBlock">
    <properties>
      <property name="allowCommentedBlocks"
                value="true" />
    </properties>
  </rule>
  <rule ref="rulesets/java/imports.xml" />
  <rule ref="rulesets/java/junit.xml">
    <exclude name="JUnitTestContainsTooManyAsserts" />
  </rule>
  <rule ref="rulesets/java/strings.xml">
    <exclude name="AvoidDuplicateLiterals" />
  </rule>
  <rule ref="rulesets/java/unnecessary.xml" />
  <rule ref="rulesets/java/unusedcode.xml" />
  <rule ref="rulesets/java/unusedcode.xml/UnusedFormalParameter">
    <properties>
      <property name="checkAll"
                value="true" />
    </properties>
  </rule>
  <!-- Custom Rules -->
  <rule name="UseRequireNonNull"
        message="Use Objects.requireNonNull() instead of throwing a NullPointerException yourself."
        language="java"
        class="net.sourceforge.pmd.lang.rule.XPathRule">
    <description>Use Objects.requireNonNull() instead of throwing a
    NullPointerException yourself.</description>
    <properties>
      <property name="xpath">
        <value>
<![CDATA[
                        //IfStatement[child::Expression//NullLiteral]/Statement//ThrowStatement/Expression/PrimaryExpression/PrimaryPrefix/AllocationExpression/ClassOrInterfaceType[@Image='NullPointerException']
                    ]]>
        </value>
      </property>
    </properties>
    <priority>3</priority>
    <example>
<![CDATA[
                public class Example {
                        public Example(Object example) {
                                if (example == null) {
                                        throw new NullPointerException();
                                }
                        }
                }
            ]]>
    </example>
  </rule>
</ruleset>