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">

<!--
For details and full list of available checks:
http://checkstyle.sourceforge.net/availablechecks.html
-->
<module name="Checker">
    <module name="FileTabCharacter"/>
    <module name="NewlineAtEndOfFile"/>
    <module name="RegexpSingleline">
        <property name="format" value="\s+$"/>
        <property name="message" value="Line has trailing spaces."/>
    </module>

    <module name="TreeWalker">
        <property name="cacheFile" value="${checkstyle.cache.file}"/>

        <module name="AnnotationLocation"/>
        <module name="ArrayTrailingComma"/>
        <module name="ArrayTypeStyle"/>
        <module name="AvoidEscapedUnicodeCharacters">
            <property name="allowNonPrintableEscapes" value="true"/>
        </module>
        <module name="AvoidNestedBlocks"/>
        <module name="AvoidStarImport">
            <property name="allowClassImports" value="false"/>
            <property name="allowStaticMemberImports" value="true"/>
        </module>
        <module name="ClassTypeParameterName">
            <property name="format" value="^[A-Z]{1,2}$"/>
        </module>
        <module name="ConstantName"/>
        <module name="CovariantEquals"/>
        <module name="DefaultComesLast"/>
        <module name="EmptyBlock">
            <property name="option" value="text"/>
        </module>
        <module name="EmptyCatchBlock">
            <property name="exceptionVariableName" value="ignored"/>
        </module>
        <module name="EmptyStatement"/>
        <module name="EqualsAvoidNull"/>
        <module name="EqualsHashCode"/>
        <module name="FallThrough">
            <property name="reliefPattern" value="falls through"/>
        </module>
        <module name="FinalClass"/>
        <module name="GenericWhitespace"/>
        <module name="HideUtilityClassConstructor"/>
        <module name="IllegalImport">
            <property name="illegalPkgs" value="sun"/>
        </module>
        <module name="IllegalInstantiation">
            <property name="classes" value="java.lang.Boolean"/>
        </module>
        <module name="IllegalThrows"/>
        <module name="IllegalType">
            <!-- Use @NotNull instead or Java 8 -->
            <property name="illegalClassNames" value="com.google.common.base.Optional"/>
        </module>
        <module name="Indentation">
            <property name="throwsIndent" value="8"/>
        </module>
        <module name="InnerAssignment"/>
        <module name="InterfaceIsType"/>
        <module name="LeftCurly"/>
        <module name="LineLength">
            <property name="max" value="140"/>
        </module>
        <module name="LocalFinalVariableName"/>
        <module name="LocalVariableName"/>
        <module name="MemberName"/>
        <module name="MethodName"/>
        <module name="MethodParamPad"/>
        <module name="MethodTypeParameterName">
            <property name="format" value="^[A-Z]{1,2}$"/>
        </module>
        <module name="MissingSwitchDefault"/>
        <module name="ModifiedControlVariable"/>
        <module name="ModifierOrder"/>
        <module name="MultipleVariableDeclarations"/>
        <module name="MutableException">
            <property name="format" value="^.*Exception$"/>
        </module>
        <module name="NeedBraces">
            <property name="tokens" value="LITERAL_DO, LITERAL_ELSE, LITERAL_FOR, LITERAL_WHILE"/>
        </module>
        <module name="NestedForDepth">
            <property name="max" value="2"/>
        </module>
        <module name="NestedIfDepth">
            <property name="max" value="2"/>
        </module>
        <module name="NestedTryDepth">
            <property name="max" value="2"/>
        </module>
        <module name="NoClone"/>
        <module name="NoWhitespaceAfter"/>
        <module name="NoWhitespaceBefore"/>
        <module name="OneStatementPerLine"/>
        <module name="OneTopLevelClass"/>
        <module name="OuterTypeFilename"/>
        <module name="PackageDeclaration"/>
        <module name="PackageName"/>
        <module name="ParameterName"/>
        <module name="ParameterNumber">
            <property name="max" value="6"/>
            <property name="ignoreOverriddenMethods" value="true"/>
            <property name="tokens" value="METHOD_DEF"/>
        </module>
        <module name="ParenPad"/>
        <module name="RedundantImport"/>
        <module name="RedundantModifier"/>
        <module name="RightCurly"/>
        <module name="SimplifyBooleanExpression"/>
        <module name="SimplifyBooleanReturn"/>
        <module name="StaticVariableName"/>
        <module name="StringLiteralEquality"/>
        <module name="TypeName"/>
        <module name="TypecastParenPad"/>
        <module name="UnusedImports"/>
        <module name="UpperEll"/>
        <module name="VisibilityModifier">
            <property name="protectedAllowed" value="true"/>
        </module>
        <module name="WhitespaceAfter"/>
        <module name="WhitespaceAround">
            <property name="allowEmptyConstructors" value="true"/>
            <property name="allowEmptyMethods" value="true"/>
        </module>
    </module>
</module>