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="fileExtensions" value="java, properties, xml"/>
    <module name="BeforeExecutionExclusionFileFilter">
        <property name="fileNamePattern" value="^.*/.*Should.java$"/>
    </module>

    <!-- Checks for whitespace                               -->
    <!-- See http://checkstyle.sf.net/config_whitespace.html -->
    <module name="FileTabCharacter"/>

    <module name="TreeWalker">

        <!-- Checks for imports                              -->
        <!-- See http://checkstyle.sf.net/config_import.html -->
        <module name="IllegalImport"/> <!-- defaults to sun.* packages -->
        <module name="RedundantImport"/>
        <module name="UnusedImports">
            <property name="processJavadoc" value="false"/>
        </module>
        <module name="ImportOrder">
            <property name="groups" value="*,javax,java"/>
            <property name="ordered" value="false"/>
            <property name="separated" value="true"/>
            <property name="option" value="bottom"/>
            <property name="sortStaticImportsAlphabetically" value="true"/>
        </module>
        <module name="SuppressionXpathSingleFilter">
            <property name="checks" value="ImportOrder"/>
            <property name="message" value="^'java\..*'.*"/>
        </module>

        <module name="NoLineWrap"/>

        <!-- Checks for whitespace                               -->
        <!-- See http://checkstyle.sf.net/config_whitespace.html -->
        <module name="NoWhitespaceAfter"/>
        <module name="NoWhitespaceBefore"/>
        <module name="WhitespaceAfter"/>
        <module name="GenericWhitespace"/>

        <module name="LeftCurly"/>
        <module name="EmptyLineSeparator">
            <property name="allowNoEmptyLineBetweenFields" value="true"/>
        </module>
        <module name="Indentation"/>


        <!-- Checks for Naming Conventions.                  -->
        <!-- See https://checkstyle.org/config_naming.html -->
        <module name="ConstantName"/>
        <module name="LocalFinalVariableName"/>
        <module name="LocalVariableName"/>
        <module name="MemberName"/>
        <module name="MethodName"/>
        <module name="PackageName"/>
        <module name="ParameterName"/>
        <module name="StaticVariableName"/>
        <module name="TypeName"/>
        <module name="AbbreviationAsWordInName">
            <property name="allowedAbbreviationLength" value="0"/>
        </module>
    </module>

</module>