checkstyle.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="Checker">
 <property name="charset" value="UTF-8"/>
 <module name="TreeWalker">
 <module name="AnnotationLocation">
 <property name="allowSamelineSingleParameterlessAnnotation" value="false"/>
 </module>
 <module name="AnnotationUseStyle"/>
 <module name="MissingDeprecated"/>
 <module name="MissingOverride"/>
 <module name="AvoidNestedBlocks">
 <property name="allowInSwitchCase" value="true"/>
 </module>
 <module name="LeftCurly">
 <property name="ignoreEnums" value="false"/>
 </module>
 <module name="NeedBraces"/>
 <module name="RightCurly"/>
 <module name="HideUtilityClassConstructor"/>
 <module name="OneTopLevelClass"/>
 <module name="VisibilityModifier"/>
 <module name="CovariantEquals"/>
 <module name="DeclarationOrder"/>
 <module name="DefaultComesLast"/>
 <module name="EmptyStatement"/>
 <module name="EqualsAvoidNull"/>
 <module name="EqualsHashCode"/>
 <module name="ExplicitInitialization"/>
 <module name="FinalLocalVariable"/>
 <module name="IllegalInstantiation">
 <property name="classes" value="java.lang.Boolean"/>
 </module>
 <module name="IllegalTokenText">
 <property name="tokens" value="NUM_INT,NUM_LONG"/>
 <property name="format" value="^0[^lx]"/>
 <property name="ignoreCase" value="true"/>
 </module>
 <module name="IllegalType">
 <property name="illegalClassNames" value="java.util.HashSet, java.util.HashMap, java.util.TreeSet, java.util.TreeMap"/>
 </module>
 <module name="InnerAssignment"/>
 <module name="MissingSwitchDefault"/>
 <module name="MultipleVariableDeclarations"/>
 <module name="NoFinalizer"/>
 <module name="OneStatementPerLine"/>
 <module name="OverloadMethodsDeclarationOrder"/>
 <module name="PackageDeclaration"/>
 <module name="SimplifyBooleanExpression"/>
 <module name="SimplifyBooleanReturn"/>
 <module name="StringLiteralEquality"/>
 <module name="UnnecessaryParentheses"/>
 <module name="AvoidStarImport"/>
 <module name="IllegalImport">
 <property name="illegalPkgs" value="sun, junit.framework"/>
 </module>
 <module name="RedundantImport"/>
 <module name="UnusedImports"/>
 <module name="ArrayTypeStyle"/>
 <module name="CommentsIndentation"/>
 <!-- Comparing this with null (i.e. this == null and this != null): -->
 <module name="DescendantToken">
 <property name="tokens" value="EQUAL,NOT_EQUAL"/>
 <property name="limitedTokens" value="LITERAL_THIS,LITERAL_NULL"/>
 <property name="maximumNumber" value="1"/>
 <property name="maximumDepth" value="1"/>
 <property name="sumTokenCounts" value="true"/>
 </module>
 <!--The initialiser in for performs no setup (where a while statement could be used instead): -->
 <module name="DescendantToken">
 <property name="tokens" value="FOR_INIT"/>
 <property name="limitedTokens" value="EXPR"/>
 <property name="minimumNumber" value="1"/>
 </module>
 <module name="OuterTypeFilename"/>
 <module name="UpperEll"/>
 <module name="ModifierOrder"/>
 <module name="RedundantModifier"/>
 <module name="ClassTypeParameterName"/>
 <module name="ConstantName"/>
 <module name="InterfaceTypeParameterName"/>
 <module name="LocalFinalVariableName"/>
 <module name="LocalVariableName"/>
 <module name="MemberName"/>
 <module name="MethodName"/>
 <module name="MethodTypeParameterName"/>
 <module name="PackageName">
 <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
 </module>
 <module name="ParameterName"/>
 <module name="StaticVariableName"/>
 <module name="TypeName"/>
 <module name="OuterTypeNumber"/>
 <module name="GenericWhitespace"/>
 <module name="MethodParamPad"/>
 <!--<module name="ParenPad"/> disabled due to the bug in the NetBeans (nb-javac)
 "try with resources formatting adding extra space" https://github.com/apache/netbeans/issues/3720
 Let's make our life easier, just skip this check temporarily -->
 <module name="TypecastParenPad"/>
 <module name="WhitespaceAfter"/>
 <module name="WhitespaceAround">
 <property name="tokens" value="ASSIGN"/>
 </module>
 </module>
 <module name="LineLength">
 <property name="max" value="120"/>
 <property name="ignorePattern" value="^ *\* *[^ ]+$"/>
 </module>
 <module name="NewlineAtEndOfFile">
 <property name="lineSeparator" value="lf"/>
 </module>
 <module name="UniqueProperties"/>
 <!-- the check to find trailing whitespace at the end of a line: -->
 <module name="RegexpSingleline">
 <!-- \s matches whitespace character, $ matches end of line. -->
 <property name="format" value="\s+$"/>
 </module>
 <module name="FileTabCharacter">
 <property name="eachLine" value="true"/>
 </module>
</module>