pmd/pmd-core/etc/checkstyle-suppressions.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suppressions PUBLIC
     "-//Puppy Crawl//DTD Suppressions 1.0//EN"
     "http://www.puppycrawl.com/dtds/suppressions_1_0.dtd">
<suppressions>
    <suppress files="[\\/]generated-sources[\\/]" checks="[a-zA-Z0-9]*"/>

    <!-- The velocity language is under the Apache License. -->
    <suppress checks="RegexpHeaderCheck" files="net/sourceforge/pmd/lang/vm/.*"/>
    <!-- Part of pmd-scal is under LGPL -->
    <suppress checks="RegexpHeadercheck" files="org/sonar/plugins/scala/.*"/>

    <suppress checks="AvoidStarImportCheck" files="(net/sourceforge/pmd/lang/java/rule/AbstractJavaRule.java)|(net/sourceforge/pmd/lang/plsql/rule/AbstractPLSQLRule.java)"/>
</suppressions>