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="fileExtensions" value="java"/>

    <module name="TreeWalker">

        <!-- Block Checks -->
        <module name="AvoidNestedBlocks">
            <property name="allowInSwitchCase" value="true"/>
        </module>
        <module name="EmptyBlock">
            <property name="tokens" value="LITERAL_CATCH"/>
            <property name="tokens" value="ARRAY_INIT"/>
            <property name="tokens" value="LITERAL_DEFAULT"/>
            <property name="tokens" value="LITERAL_CASE"/>
            <property name="option" value="text"/>
        </module>
        <module name="EmptyCatchBlock"/>
        <module name="LeftCurly">
            <property name="maxLineLength" value="100"/>
        </module>
        <module name="NeedBraces"/>
        <module name="NeedBraces">
            <property name="tokens" value="LAMBDA"/>
            <property name="allowSingleLineStatement" value="true"/>
        </module>
        <module name="RightCurly">
            <property name="tokens" value="METHOD_DEF"/>
            <property name="tokens" value="CTOR_DEF"/>
            <property name="tokens" value="CLASS_DEF"/>
            <property name="tokens" value="INSTANCE_INIT"/>
            <property name="tokens" value="LITERAL_FOR"/>
            <property name="tokens" value="STATIC_INIT"/>
            <property name="tokens" value="LITERAL_WHILE"/>
            <property name="option" value="alone"/>
        </module>
        <module name="RightCurly">
            <property name="tokens" value="LITERAL_DO"/>
            <property name="option" value="same"/>
        </module>

        <!-- Class Design -->
        <module name="FinalClass"/>
        <module name="HideUtilityClassConstructor"/>
        <module name="OneTopLevelClass"/>
        <module name="ThrowsCount">
            <property name="max" value="2"/>
        </module>
        <module name="VisibilityModifier"/>

        <!-- Coding -->
        <module name="AvoidInlineConditionals"/>
        <module name="CovariantEquals"/>
        <module name="DefaultComesLast"/>
        <module name="EmptyStatement"/>
        <module name="EqualsAvoidNull"/>
        <module name="EqualsHashCode"/>
        <module name="ExplicitInitialization"/>
        <module name="FallThrough"/>
        <module name="HiddenField">
            <property name="ignoreConstructorParameter" value="true"/>
            <property name="ignoreSetter" value="true"/>
            <property name="setterCanReturnItsClass" value="true"/>
        </module>
        <module name="IllegalCatch">
            <property name="illegalClassNames"
                      value="java.lang.Exception, java.lang.Throwable, java.lang.RuntimeException, java.lang.NullPointerException"/>
        </module>
        <module name="IllegalInstantiation">
            <property name="classes" value="org.xml.sax.SAXException, org.xml.sax.SAXParseException, org.apache.commons.beanutils.ConversionException,
                org.antlr.v4.runtime.misc.ParseCancellationException, antlr.RecognitionException, antlr.TokenStreamException, antlr.TokenStreamRecognitionException, antlr.ANTLRException"/>
        </module>
        <module name="IllegalThrows"/>
        <module name="IllegalToken">
            <property name="tokens" value="LABELED_STAT"/>
            <property name="tokens" value="LITERAL_NATIVE"/>
            <property name="tokens" value="LITERAL_VOLATILE"/>
            <property name="tokens" value="LITERAL_ASSERT"/>
        </module>
        <module name="InnerAssignment"/>
        <module name="MagicNumber"/>
        <module name="MissingSwitchDefault"/>
        <module name="ModifiedControlVariable"/>
        <module name="MultipleVariableDeclarations"/>
        <module name="NestedForDepth">
            <property name="max" value="2"/>
        </module>
        <module name="NestedIfDepth">
            <property name="max" value="3"/>
        </module>
        <module name="NestedTryDepth"/>
        <module name="OneStatementPerLine"/>
        <module name="OverloadMethodsDeclarationOrder"/>
        <module name="PackageDeclaration"/>
        <module name="ParameterAssignment"/>
        <module name="SimplifyBooleanExpression"/>
        <module name="SimplifyBooleanReturn"/>
        <module name="StringLiteralEquality"/>
        <module name="VariableDeclarationUsageDistance"/>

        <!-- Metrics -->
        <module name="BooleanExpressionComplexity">
            <property name="max" value="7"/>
        </module>
        <module name="ClassFanOutComplexity">
            <property name="max" value="25"/>
            <!-- Default classes are also listed-->
            <property name="excludedClasses"
                      value="boolean, byte, char, double, float, int, long, short,  void, Boolean, Byte, Character, Double, Float, Integer, Long, Short, Void, Object, Class, String, StringBuffer, StringBuilder, ArrayIndexOutOfBoundsException, Exception, RuntimeException, IllegalArgumentException, IllegalStateException, IndexOutOfBoundsException, NullPointerException, Throwable, SecurityException, UnsupportedOperationException, List, ArrayList, Deque, Queue, LinkedList, Set, HashSet, SortedSet, TreeSet, Map, HashMap, SortedMap, TreeMap, DetailsAST, CheckstyleException, UnsupportedEncodingException, BuildException, ConversionException, FileNotFoundException, TestException, Log, Sets, Multimap, TokenStreamRecognitionException, RecognitionException, TokenStreamException, IOException"/>
        </module>
        <module name="CyclomaticComplexity">
            <property name="switchBlockAsSingleDecisionPoint" value="true"/>
        </module>
        <module name="JavaNCSS"/>
        <module name="NPathComplexity"/>

        <!-- Modifiers -->
        <module name="ModifierOrder"/>
        <module name="RedundantModifier"/>
        <!-- Naming Conventions -->
        <module name="AbbreviationAsWordInName">
            <property name="ignoreFinal" value="false"/>
            <property name="allowedAbbreviationLength" value="0"/>
            <property name="allowedAbbreviations" value="AST"/>
        </module>
        <module name="AbstractClassName"/>
        <module name="ClassTypeParameterName"/>
        <module name="ConstantName"/>
    </module>
</module>