checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
        "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
        "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
<module name="Checker">

    <module name="FileTabCharacter"/>

    <module name="TreeWalker">
        <property name="fileExtensions" value="java"/>
        <property name="tabWidth" value="4"/>

        <!-- imports -->
        <module name="IllegalImport"/> <!-- defaults to sun.* packages -->
        <module name="RedundantImport"/>

        <!-- potential errors -->
        <module name="EqualsHashCode"/>
        <module name="MissingSwitchDefault"/>

        <!-- naming -->
        <module name="PackageName"/>
        <module name="MethodName"/>

        <!-- formatting -->
        <module name="SeparatorWrap">
            <property name="tokens" value="DOT"/>
            <property name="option" value="nl"/>
        </module>
        <module name="SeparatorWrap">
            <property name="tokens" value="COMMA"/>
            <property name="option" value="EOL"/>
        </module>

        <module name="LineLength">
            <property name="max" value="160"/>
            <property name="ignorePattern" value="@see|@link|^package.*|^import.*|a href|href|http://|https://"/>
        </module>
    </module>

</module>