checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE module PUBLIC
  "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
  "https://checkstyle.org/dtds/configuration_1_3.dtd">
<module name="Checker">
    <module name="TreeWalker">
        <module name="ArrayTypeStyle"/>
        <module name="AvoidStarImport"/>
        <module name="ConstantName">
            <!--Exceptions: underscore followed by lowercase SI unit and a number followed by lowercase x.-->
            <property name="format" value="^[A-Z][A-Z0-9]*(?:_(?:[A-Za-z]+[0-9]+x?|[0-9]+x?|[A-Za-z]+))*$"/>
        </module>
        <module name="DefaultComesLast"/>
        <module name="EmptyStatement"/>
        <module name="NeedBraces"/>
        <module name="RedundantImport"/>
        <module name="SimplifyBooleanReturn"/>
        <module name="StringLiteralEquality"/>
        <module name="TrailingComment">
            <property name="format" value="^\s*$"/>
        </module>
        <module name="UnusedImports"/>
        <module name="UnusedLocalVariable"/>
    </module>
</module>