commons-lang/checkstyle.xml

<?xml version="1.0"?>
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this work for additional information regarding copyright ownership.
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<!DOCTYPE module PUBLIC
    "-//Puppy Crawl//DTD Check Configuration 1.1//EN"
    "http://www.puppycrawl.com/dtds/configuration_1_1.dtd">

<!-- Apache Commons Lang customization of default Checkstyle behavior -->
<module name="Checker">
  <property name="localeLanguage" value="en"/>
  <module name="JavadocPackage"/>
  <module name="NewlineAtEndOfFile">
    <property name="lineSeparator" value="lf" />
  </module>
  <module name="FileTabCharacter">
    <property name="fileExtensions" value="java,xml"/>
  </module>
  <module name="RegexpSingleline">
    <!-- \s matches whitespace character, $ matches end of line. -->
    <property name="format" value="\s+$"/>
    <property name="message" value="Line has trailing spaces."/>
  </module>
  <module name="SuppressionFilter">
    <property name="file" value="checkstyle-suppressions.xml"/>
  </module>
  <module name="TreeWalker">
    <module name="AvoidStarImport"/>
    <module name="IllegalImport"/>
    <module name="RedundantImport"/>
    <module name="UnusedImports"/>
    <module name="NeedBraces"/>
    <module name="JavadocMethod">
      <property name="allowUndeclaredRTE" value="true"/>
      <property name="scope" value="public" />
    </module>
    <module name="ModifierOrder"/>
    <module name="RedundantModifier"/>
    <module name="UpperEll" />
    <module name="LeftCurly"/>
    <module name="NeedBraces"/>
    <module name="RightCurly"/>
    <module name="GenericWhitespace"/>
    <module name="WhitespaceAfter"/>
    <module name="NoWhitespaceBefore"/>
 </module>
</module>