checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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="FileLength">
        <property name="max" value="3500"/>
        <property name="fileExtensions" value="java"/>
    </module>
    <module name="FileTabCharacter"/>
    
    <module name="SuppressionFilter">
        <property name="file" value="${checkstyle.suppressions.file}" />
    </module>

    <!-- Miscellaneous -->
    <module name="NewlineAtEndOfFile"/> <!-- Hinted to by the .editorconfig file-->
    <module name="UniqueProperties"/>

    <module name="TreeWalker">
        <module name="InterfaceTypeParameterName"/>
        <module name="MethodName"/>
        <module name="LocalFinalVariableName"/>
        <module name="LocalVariableName"/>
        <module name="UnusedImports"/>
        <module name="StaticVariableName"/>
        <module name="TypeName"/>
        <module name="MemberName"/>
        <module name="MethodTypeParameterName"/>
        <module name="PackageName"/>
        <module name="ParameterName"/>
        <module name="StaticVariableName"/>
        <module name="TypeName"/>
        <module name="RedundantModifier"/>
        <module name="ModifierOrder"/>
        <module name="EqualsHashCode"/>
        <module name="EmptyStatement"/>
        <module name="SimplifyBooleanExpression"/>
        <module name="ParameterAssignment"/>
        <module name="SimplifyBooleanReturn"/>
        <module name="VariableDeclarationUsageDistance"/>
        <module name="ParameterNumber">
            <property name="max" value="5"/>
            <property name="tokens" value="METHOD_DEF"/>
        </module>
        <module name="JavadocMethod">
            <property name="allowMissingJavadoc" value="true" />
            <property name="allowMissingReturnTag" value="true" />
            <property name="allowMissingParamTags" value="true" />
            <property name="allowMissingThrowsTags" value="true" />
        </module>
        <module name="EnumValueName"/>

    </module>

    <!-- Whitespace -->
    <module name="TreeWalker" >
        <module name="ParenPad"/>
        <module name="GenericWhitespace"/>
        <module name="TypecastParenPad"/>
        <module name="SingleSpaceSeparator"/>

        <!--Cannot have any whitespace before this token-->
        <module name="NoWhitespaceBefore">
            <property name="tokens" value="COMMA, SEMI, POST_INC, POST_DEC, GENERIC_END, ELLIPSIS, METHOD_REF"/>
            <property name="allowLineBreaks" value="false"/>
        </module>
        <!--Can only have whitespace before this token if it's first token on line-->
        <module name="NoWhitespaceBefore">
            <property name="tokens" value="DOT"/>
            <property name="allowLineBreaks" value="true"/>
        </module>

        <!--No whitespace directly after this token-->
        <module name="NoWhitespaceAfter">
            <property name="tokens" value="AT, INC, DEC, UNARY_MINUS, UNARY_PLUS, BNOT, LNOT, DOT, ARRAY_DECLARATOR, INDEX_OP, METHOD_REF"/>
        </module>

        <!-- Make sure that method calls have no space between method name and left parenthesis -->
        <module name="MethodParamPad">
            <property name="option" value="nospace"/>
            <property name="tokens" value="CTOR_DEF, LITERAL_NEW, METHOD_CALL, METHOD_DEF, SUPER_CTOR_CALL, ENUM_CONSTANT_DEF"/>
        </module>

        <!-- These separators (. @ ::) cannot appear at end of a line-->
        <module name="SeparatorWrap">
            <property name="tokens" value="DOT, AT, METHOD_REF"/>
            <property name="option" value="nl"/>
        </module>
        <!-- These separators (, ;) cannot appear at start of a line-->
        <module name="SeparatorWrap">
            <property name="tokens" value="COMMA, SEMI"/>
            <property name="option" value="EOL"/>
        </module>

        <module name="NoLineWrap">
            <property name="tokens" value="IMPORT, STATIC_IMPORT, PACKAGE_DEF"/>
        </module>

        <!-- Cannot be the first token on the line -->
        <module name="OperatorWrap">
            <property name="option" value="eol"/>

            <property name="tokens" value="TYPE_EXTENSION_AND, SR, BSR, SL, BXOR, BOR, BAND"/>
            <property name="tokens" value="SR_ASSIGN, BSR_ASSIGN, SL_ASSIGN, BXOR_ASSIGN, BOR_ASSIGN, BAND_ASSIGN"/>

            <!--<property name="tokens" value="PLUS"/>--> <!-- TODO: uncomment -->
            <property name="tokens" value="DIV, MINUS, STAR, MOD"/>
            <property name="tokens" value="PLUS_ASSIGN, DIV_ASSIGN, MINUS_ASSIGN, STAR_ASSIGN, MOD_ASSIGN"/>
            <property name="tokens" value="LITERAL_INSTANCEOF, METHOD_REF, QUESTION, COLON"/>
            <property name="tokens" value="GE, GT, LE, LT"/>
            <!--<property name="tokens" value="LOR, LAND"/>--> <!-- TODO: uncomment -->
            <property name="tokens" value="EQUAL, NOT_EQUAL"/>
        </module>
        <!-- Cannot be last token on the line-->
        <module name="OperatorWrap">
            <property name="option" value="nl"/>

            <!--<property name="tokens" value="ASSIGN"/>--> <!-- TODO: uncomment -->

            <property name="tokens" value="TYPE_EXTENSION_AND, SR, BSR, SL, BXOR, BOR, BAND"/>
            <property name="tokens" value="SR_ASSIGN, BSR_ASSIGN, SL_ASSIGN, BXOR_ASSIGN, BOR_ASSIGN, BAND_ASSIGN"/>

            <!--<property name="tokens" value="PLUS"/>--> <!-- TODO: uncomment -->
            <property name="tokens" value="DIV, MINUS, STAR, MOD"/>
            <property name="tokens" value="PLUS_ASSIGN, DIV_ASSIGN, MINUS_ASSIGN, STAR_ASSIGN, MOD_ASSIGN"/>
            <property name="tokens" value="LITERAL_INSTANCEOF, METHOD_REF, QUESTION, COLON"/>
            <property name="tokens" value="GE, GT, LE, LT"/>
            <!--<property name="tokens" value="LOR, LAND"/>--> <!-- TODO: uncomment -->
            <property name="tokens" value="EQUAL, NOT_EQUAL"/>
        </module>
    </module>

</module>