checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
    "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
    "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
<module name="Checker">
    <property name="charset" value="UTF-8" />

    <property name="tabWidth" value="4" />

    <module name="LineLength">
        <property name="max" value="120"/>
        <property name="fileExtensions" value="java"/>
    </module>

    <module name="TreeWalker">
        <module name="ParameterNumber">
            <property name="max" value="10"/>
        </module>

        <module name="NestedIfDepth">
            <property name="max" value="3"/>
        </module>

        <module name="RedundantImport"/>

        <module name="UnusedImports"/>

        <module name="MethodName"/>

        <module name="PackageName"/>

        <module name="NeedBraces"/>

        <module name="LeftCurly">
            <property name="option" value="nl"/>
        </module>
    </module>

    <module name="RegexpMultiline">
        <property name="format" value="\r?\n[ \t\x0B\f]*\r?\n[ \t\x0B\f]*\r?\n"/>
        <property name="fileExtensions" value="java"/>
        <property name="message" value="Two consecutive empty lines"/>
    </module>
</module>