checkstyle.xml

<?xml version="1.0"?>
<!-- Copyright IBM Corporation, 2013.  All rights reserved.

 This program and the accompanying materials are made available under the
 terms of the Eclipse Public License v1.0 which accompanies this distribution,
 and is available at http://www.eclipse.org/legal/epl-v10.html
-->
<!DOCTYPE module PUBLIC
    "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
    "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">

<module name="Checker">
    <module name="FileTabCharacter">
        <property name="eachLine" value="true"/>
    </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="TreeWalker">
       <module name="RedundantImport"/>
       <module name="UnusedImports"/>
    </module>

</module>