checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
        "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
        "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">

<module name="Checker">
    <module name="FileLength"/>
    <module name="FileTabCharacter"/>
    <module name="NewlineAtEndOfFile"/>

    <module name="Header">
        <property name="headerFile" value="checkstyle_header.txt"/>
        <property name="fileExtensions" value="java"/>
    </module>

    <module name="TreeWalker">
        <!-- Checks for Javadoc comments.                     -->
        <!-- See http://checkstyle.sf.net/config_javadoc.html -->
        <module name="JavadocMethod">
            <property name="scope" value="package"/>
            <property name="allowUndeclaredRTE" value="true"/>
            <property name="allowThrowsTagsForSubclasses" value="true"/>
            <property name="validateThrows" value="true"/>
            <property name="allowMissingJavadoc" value="true"/>
        </module>
        <module name="JavadocStyle"/>

        <module name="SuperClone"/>
        <module name="SuperFinalize"/>

        <!-- Checks for Naming Conventions.                  -->
        <!-- See http://checkstyle.sf.net/config_naming.html -->
        <module name="ConstantName"/>
        <module name="ClassTypeParameterName">
            <property name="format" value="^[A-Z]+$"/>
        </module>
        <module name="LocalFinalVariableName"/>
        <module name="LocalVariableName"/>
        <module name="MethodName"/>
        <module name="MethodTypeParameterName">
            <property name="format" value="^[A-Z]+$"/>
        </module>
        <module name="PackageName"/>
        <module name="ParameterName"/>
        <module name="StaticVariableName"/>
        <module name="TypeName"/>

        <!-- Checks for imports                              -->
        <!-- See http://checkstyle.sf.net/config_import.html -->
        <module name="IllegalImport"/>
        <module name="RedundantImport"/>
        <module name="UnusedImports"/>

        <!-- Checks for Size Violations.                    -->
        <!-- See http://checkstyle.sf.net/config_sizes.html -->
        <module name="LineLength">
            <property name="max" value="140"/>
        </module>
        <module name="MethodLength">
            <property name="max" value="250"/>
        </module>
        <module name="ParameterNumber">
            <property name="max" value="32"/>
        </module>
        <module name="OuterTypeNumber"/>

        <!-- Checks for whitespace                               -->
        <!-- See http://checkstyle.sf.net/config_whitespace.html -->
        <module name="GenericWhitespace"/>
        <module name="EmptyForIteratorPad"/>
        <module name="MethodParamPad"/>
        <module name="NoWhitespaceAfter">
            <property name="tokens"
                      value="BNOT, DEC, DOT, INC, LNOT, UNARY_MINUS, UNARY_PLUS"/>
        </module>
        <module name="NoWhitespaceBefore"/>
        <module name="OperatorWrap"/>
        <module name="ParenPad"/>
        <module name="TypecastParenPad"/>
        <module name="WhitespaceAfter">
            <property name="tokens" value="COMMA, SEMI"/>
        </module>
        <module name="WhitespaceAround">
            <property name="allowEmptyConstructors" value="true"/>
            <property name="allowEmptyMethods" value="true"/>
            <property name="tokens"
                      value="BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR, BXOR_ASSIGN, DIV, DIV_ASSIGN, EQUAL, GE, GT, LAND, LE, 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>

        <!-- Modifier Checks                                    -->
        <!-- See http://checkstyle.sf.net/config_modifiers.html -->
        <module name="ModifierOrder"/>
        <module name="RedundantModifier"/>

        <!-- Checks for blocks. You know, those {}'s         -->
        <!-- See http://checkstyle.sf.net/config_blocks.html -->
        <module name="AvoidNestedBlocks">
            <property name="allowInSwitchCase" value="true"/>
        </module>
        <module name="EmptyBlock">
            <!-- catch blocks need a statement or a comment. -->
            <property name="option" value="text"/>
            <property name="tokens" value="LITERAL_CATCH"/>
        </module>
        <module name="EmptyBlock">
            <!-- all other blocks need a real statement. -->
            <property name="option" value="statement"/>
            <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="LeftCurly"/>
        <module name="NeedBraces"/>
        <module name="RightCurly"/>

        <!-- Checks for common coding problems               -->
        <!-- See http://checkstyle.sf.net/config_coding.html -->
        <!-- module name="AvoidInlineConditionals"/-->
        <module name="EmptyStatement"/>
        <module name="EqualsHashCode"/>
        <module name="StringLiteralEquality"/>
        <!--<module name="HiddenField">-->
        <!--<property name="ignoreConstructorParameter" value="true"/>-->
        <!--</module>-->
        <module name="IllegalInstantiation"/>
        <module name="InnerAssignment"/>
        <module name="MissingSwitchDefault"/>
        <!--<module name="RedundantThrows"/>-->
        <module name="SimplifyBooleanExpression"/>
        <module name="SimplifyBooleanReturn"/>
        <module name="DefaultComesLast"/>

        <!-- Checks for class design                         -->
        <!-- See http://checkstyle.sf.net/config_design.html -->
        <module name="FinalClass"/>
        <!--<module name="HideUtilityClassConstructor"/>-->
        <module name="InterfaceIsType"/>
        <module name="VisibilityModifier">
            <property name="protectedAllowed" value="true"/>
        </module>
        <module name="MissingOverride"/>

        <!-- Miscellaneous other checks.                   -->
        <!-- See http://checkstyle.sf.net/config_misc.html -->
        <module name="ArrayTypeStyle"/>
        <module name="ArrayTrailingComma"/>
        <module name="UpperEll"/>
        <module name="Regexp">
            <property name="format" value="[ \t]+$"/>
            <property name="illegalPattern" value="true"/>
            <property name="message" value="Trailing whitespace"/>
        </module>


        <module name="SuppressionCommentFilter">
            <property name="offCommentFormat" value="CSOFF\: ([\w\|]+)"/>
            <property name="onCommentFormat" value="CSON\: ([\w\|]+)"/>
            <property name="checkFormat" value="$1"/>
        </module><!-- allow warnings to be suppressed -->

    </module>
</module>