checkstyle.xml

<?xml version="1.0"?>
<!--
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contributor license agreements.  See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
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     http://www.apache.org/licenses/LICENSE-2.0

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limitations under the License.
-->

<!DOCTYPE module PUBLIC
    "-//Puppy Crawl//DTD Check Configuration 1.1//EN"
    "http://www.puppycrawl.com/dtds/configuration_1_1.dtd">

<!-- commons lang customization of default Checkstyle behavior -->
<module name="Checker">
  <property name="localeLanguage" value="en"/>
  <module name="JavadocPackage">
    <property name="allowLegacy" value="false"/>
  </module>
  <module name="Header">
    <property name="headerFile" value="${checkstyle.header.file}"/>
  </module>
  <module name="FileTabCharacter">
    <property name="fileExtensions" value="java,xml"/>
  </module>
  <module name="TreeWalker">
    <module name="AvoidStarImport"/>
    <module name="RedundantImport"/>
    <module name="UnusedImports"/>
    <module name="NeedBraces"/>
    <module name="RedundantThrows">
      <property name="allowUnchecked" value="true"/>
    </module>
    <module name="LineLength">
      <property name="max" value="120"/>
    </module>
    <module name="JavadocType">
      <property name="scope" value="protected"/>
    </module>
    <module name="JavadocMethod">
      <property name="scope" value="protected"/>
      <property name="allowUndeclaredRTE" value="true"/>
    </module>
  </module>
  <!-- Line with trailing spaces -->
  <module name="RegexpSingleline">
    <property name="format" value="\s+$"/>
    <property name="message" value="Line has trailing spaces."/>
  </module>
</module>