checks.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="GcmCheckerModule">
    <module name="FileTabCharacter" />
    <module name="NewlineAtEndOfFile">
        <property name="lineSeparator" value="lf" />
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="\r" />
        <property name="message" value="Line contains carriage return" />
    </module>
    <module name="RegexpMultiline">
        <property name="format" value=" \n" />
        <property name="message" value="Line has trailing whitespace" />
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="\{\n\n" />
        <property name="message" value="Blank line after opening brace" />
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="\n\n\s*\}" />
        <property name="message" value="Blank line before closing brace" />
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="\n\n\n" />
        <property name="message" value="Multiple consecutive blank lines" />
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="\n\n\Z" />
        <property name="message" value="Blank line before end of file" />
    </module>
    <module name="RegexpSingleline">
        <property name="format" value="Preconditions\.checkNotNull" />
        <property name="message" value="Use java.util.Objects.requireNonNull instead of Preconditions\.checkNotNull" />
    </module>
    <module name="RegexpSingleline">
        <property name="format" value="^([^i]|i[^m]|im[^p]|imp[^o]|impo[^r]|impor[^t]|import[^ ]).*Objects\.requireNonNull" />
        <property name="message" value="Objects.requireNonNull should only be used with static imports" />
    </module>
    <module name="RegexpSingleline">
        <property name="format" value="Ints\.checkedCast" />
        <property name="message" value="Use Math.toIntExact instead of Ints.checkedCast" />
    </module>
    <module name="RegexpSingleline">
        <property name="format" value="^([^i]|i[^m]|im[^p]|imp[^o]|impo[^r]|impor[^t]|import[^ ]).*Math\.toIntExact" />
        <property name="message" value="Math.toIntExact should only be used with static imports" />
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="^[ \t]*import com.google.common.base.MoreObjects;$" />
        <property name="message" value="com.google.common.base.MoreObjects should only be used with static imports" />
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="^[ \t]*import org.testng.Assert;$" />
        <property name="message" value="org.testng.Assert should only be used with static imports" />
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="^[ \t]*import org.jetbrains.annotations.NotNull;$" />
        <property name="message" value="Not null is the default for the codebase and should not be annotated" />
    </module>
    <module name="RegexpMultiline">
        <property name="format" value="^[ \t]*import org.jetbrains.annotations.Nullable;$" />
        <property name="message" value="Use javax.annotation.Nullable instead of org.jetbrains.annotations.Nullable" />
    </module>

    <module name="SuppressWarningsFilter" />
    <module name="TreeWalker">
        <module name="SuppressWarningsHolder" />
        <module name="EmptyBlock">
            <property name="option" value="text" />
            <property name="tokens" value="
                LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_IF,
                LITERAL_FOR, LITERAL_TRY, LITERAL_WHILE, INSTANCE_INIT, STATIC_INIT" />
        </module>
        <module name="EmptyStatement" />
        <module name="EmptyForInitializerPad" />
        <module name="EmptyForIteratorPad">
            <property name="option" value="space" />
        </module>
        <module name="MethodParamPad">
            <property name="allowLineBreaks" value="true" />
            <property name="option" value="nospace" />
        </module>
        <module name="ParenPad" />
        <module name="TypecastParenPad" />
        <module name="NeedBraces" />
        <module name="LeftCurly">
            <property name="option" value="nl" />
            <property name="tokens" value="CLASS_DEF, CTOR_DEF, INTERFACE_DEF, METHOD_DEF" />
        </module>
        <module name="LeftCurly">
            <property name="option" value="eol" />
            <property name="tokens" value="
                 LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_FOR,
                 LITERAL_IF, LITERAL_SWITCH, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE" />
        </module>
        <module name="RightCurly">
            <property name="option" value="alone" />
        </module>
        <module name="GenericWhitespace" />
        <module name="WhitespaceAfter" />
        <module name="NoWhitespaceBefore" />

        <module name="UpperEll" />
        <module name="DefaultComesLast" />
        <module name="ArrayTypeStyle" />
        <module name="MultipleVariableDeclarations" />
        <module name="ModifierOrder" />
        <module name="OneStatementPerLine" />
        <module name="StringLiteralEquality" />
        <module name="MutableException" />
        <module name="EqualsHashCode" />
        <module name="InnerAssignment" />
        <module name="InterfaceIsType" />
        <module name="HideUtilityClassConstructor" />

        <module name="MemberName" />
        <module name="LocalVariableName" />
        <module name="LocalFinalVariableName" />
        <module name="TypeName" />
        <module name="PackageName" />
        <module name="ParameterName" />
        <module name="StaticVariableName" />
        <module name="ClassTypeParameterName">
            <property name="format" value="^[A-Z][0-9]?$" />
        </module>
        <module name="MethodTypeParameterName">
            <property name="format" value="^[A-Z][0-9]?$" />
        </module>

        <module name="AvoidStarImport" />
        <module name="RedundantImport" />
        <module name="UnusedImports" />
        <module name="ImportOrder">
            <property name="groups" value="*,javax,java" />
            <property name="separated" value="true" />
            <property name="option" value="bottom" />
            <property name="sortStaticImportsAlphabetically" value="true" />
        </module>

        <module name="WhitespaceAround">
            <property name="allowEmptyConstructors" value="true" />
            <property name="allowEmptyMethods" value="true" />
            <property name="ignoreEnhancedForColon" value="false" />
            <property name="tokens" value="
                ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN,
                BXOR, BXOR_ASSIGN, COLON, DIV, DIV_ASSIGN, EQUAL, GE, GT, LAND, LE,
                LITERAL_ASSERT, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE,
                LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF, LITERAL_RETURN,
                LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE,
                LOR, LT, MINUS, MINUS_ASSIGN, MOD, MOD_ASSIGN, NOT_EQUAL,
                PLUS, PLUS_ASSIGN, QUESTION, SL, SLIST, SL_ASSIGN, SR, SR_ASSIGN,
                STAR, STAR_ASSIGN, TYPE_EXTENSION_AND" />
        </module>

        <module name="IllegalToken">
            <property name="tokens" value="LITERAL_ASSERT" />
        </module>

        <module name="IllegalImport">
            <property name="illegalPkgs" value="
                jersey.repackaged,
                jdk.nashorn.internal,
                jdk.internal" />
        </module>
    </module>
</module>