checkstyle.xml

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

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

    <module name="NewlineAtEndOfFile">
        <property name="fileExtensions" value="properties"/>
    </module>
    <module name="UniqueProperties">
        <property name="fileExtensions" value="properties" />
    </module>
    <module name="FileTabCharacter">
        <property name="eachLine" value="true"/>
    </module>
    <module name="LineLength">
        <property name="max" value="122"/>
    </module>

    <module name="TreeWalker">
        <property name="tabWidth" value="4"/>

        <!-- Annotation -->
        <module name="AnnotationLocation"/>
        <module name="AnnotationUseStyle"/>
        <module name="PackageAnnotation"/>

        <!-- Blocks -->
        <module name="LeftCurly">
            <property name="ignoreEnums" value="false"/>
        </module>
        <module name="NeedBraces"/>
        <module name="RightCurly"/>

        <!-- Design -->
        <module name="FinalClass"/>
        <module name="InterfaceIsType"/>
        <module name="OneTopLevelClass"/>
        <module name="ThrowsCount"/>

        <!-- Coding -->
        <module name="DeclarationOrder"/>
        <module name="EqualsHashCode"/>
        <module name="FallThrough"/>
        <module name="InnerAssignment"/>
        <module name="MultipleVariableDeclarations"/>
        <module name="OneStatementPerLine"/>
        <module name="PackageDeclaration"/>
        <module name="SimplifyBooleanExpression"/>
        <module name="StringLiteralEquality"/>
        <module name="UnnecessaryParentheses"/>

        <!-- Imports -->
        <module name="AvoidStarImport"/>
        <module name="RedundantImport"/>
        <module name="UnusedImports"/>

        <!-- Miscellaneous -->
        <module name="ArrayTypeStyle"/>
        <module name="OuterTypeFilename"/>
        <module name="OuterTypeFilename"/>
        <module name="UpperEll"/>

        <!-- Modifiers -->
        <module name="ModifierOrder"/>
        <module name="RedundantModifier"/>

        <!-- Naming -->
        <module name="AbbreviationAsWordInName">
            <property name="allowedAbbreviationLength" value="0"/>
        </module>
        <module name="ConstantName">
            <property name="format" value="^log|[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
        </module>
        <module name="LocalFinalVariableName"/>
        <module name="LocalVariableName">
            <property name="allowOneCharVarInForLoop" value="true"/>
        </module>
        <module name="MemberName"/>
        <module name="MethodName"/>
        <module name="PackageName">
            <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
        </module>
        <module name="ParameterName"/>
        <module name="StaticVariableName"/>
        <module name="TypeName"/>

        <!-- Size -->
        <module name="OuterTypeNumber"/>

        <!-- Whitespace -->
        <module name="EmptyForInitializerPad"/>
        <module name="EmptyForIteratorPad"/>
        <module name="EmptyLineSeparator">
            <property name="allowNoEmptyLineBetweenFields" value="true"/>
            <property name="allowMultipleEmptyLines" value="false"/>
            <property name="allowMultipleEmptyLinesInsideClassMembers" value="false"/>
        </module>
        <module name="AvoidNoArgumentSuperConstructorCall"/>
        <module name="GenericWhitespace"/>
        <module name="MethodParamPad"/>
        <module name="NoArrayTrailingComma"/>
        <module name="NoLineWrap"/>
        <module name="NoEnumTrailingComma"/>
        <module name="OperatorWrap"/>
        <module name="ParenPad"/>
        <module name="SeparatorWrap">
            <property name="tokens" value="COMMA"/>
            <property name="option" value="eol"/>
        </module>
        <module name="SeparatorWrap">
            <property name="tokens" value="DOT"/>
            <property name="option" value="nl"/>
        </module>
        <module name="TypecastParenPad"/>
        <module name="UnnecessarySemicolonAfterTypeMemberDeclaration"/>
        <module name="UnnecessarySemicolonInEnumeration"/>
        <module name="UnnecessarySemicolonInTryWithResources">
            <property name="allowWhenNoBraceAfterSemicolon" value="true"/>
        </module>
        <module name="WhitespaceAfter"/>
    </module>
</module>