checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
        "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
        "http://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">

<module name="Checker">
    <property name="charset" value="UTF-8"/>
    <property name="fileExtensions" value="java"/>

    <module name="Header">
        <property name="headerFile" value="/checkstyle-header.txt"/>
        <property name="fileExtensions" value="java"/>
    </module>

    <!-- TreeWalker Checks -->
    <module name="TreeWalker">
        <module name="SuppressWarningsHolder"/>

        <module name="AvoidStarImport"/>
        <module name="AvoidEscapedUnicodeCharacters">
            <property name="allowEscapesForControlCharacters" value="true"/>
            <property name="allowByTailComment" value="true"/>
            <property name="allowNonPrintableEscapes" value="true"/>
        </module>
        <module name="NoLineWrap"/>
        <module name="OuterTypeFilename"/>
        <module name="UnusedImports"/>
        <module name="RedundantImport"/>

        <module name="EqualsHashCode"/>

        <!--<module name="CustomImportOrder">-->
        <!--<property name="specialImportsRegExp" value="org.apache.dubbo.*"/>-->
        <!--<property name="sortImportsInGroupAlphabetically" value="false"/>-->
        <!--<property name="customImportOrderRules" value="SPECIAL_IMPORTS###THIRD_PARTY_PACKAGE###STANDARD_JAVA_PACKAGE###STATIC"/>-->
        <!--</module>-->
    </module>
</module>