checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE module PUBLIC "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN" "https://checkstyle.org/dtds/configuration_1_3.dtd">

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

		<!-- Annotations -->
		<module name="AnnotationLocation">
			<property name="allowSamelineSingleParameterlessAnnotation" value="true"/>
		</module>
		<module name="AnnotationUseStyle"/>
		<module name="MissingDeprecated"/>
		<module name="MissingOverride"/>
		<module name="PackageAnnotation"/>
		<module name="SuppressWarnings"/>

		<!-- Block Checks -->
		<module name="AvoidNestedBlocks"/>
		<module name="EmptyBlock">
			<property name="option" value="text"/>
		</module>
		<module name="EmptyCatchBlock"/>
		<module name="LeftCurly">
			<property name="ignoreEnums" value="false"/>
		</module>
		<module name="NeedBraces"/>
		<module name="RightCurly"/>

		<!-- Class Design -->
		<module name="FinalClass"/>
		<module name="HideUtilityClassConstructor"/>
		<module name="InterfaceIsType"/>
		<module name="MutableException"/>
		<module name="OneTopLevelClass"/>
		<module name="ThrowsCount">
			<property name="max" value="3"/>
		</module>

		<!-- Coding -->
		<module name="ArrayTrailingComma"/>
		<module name="AvoidDoubleBraceInitialization"/>
		<module name="CovariantEquals"/>
		<module name="DeclarationOrder">
			<property name="ignoreModifiers" value="true"/>
		</module>
		<module name="DefaultComesLast"/>
		<module name="EmptyStatement"/>
		<module name="EqualsAvoidNull"/>
		<module name="EqualsHashCode"/>
		<module name="FallThrough">
			<property name="checkLastCaseGroup" value="true"/>
			<property name="reliefPattern" value="\$FALL-THROUGH\$|fallthru|falls? ?through"/>
		</module>
		<module name="IllegalInstantiation">
			<property name="classes" value="java.lang.Boolean, java.lang.Byte, java.lang.Character, java.lang.Short, java.lang.Integer, java.lang.Long, java.lang.Float, java.lang.Double"/>
		</module>
		<module name="IllegalThrows"/>
		<module name="InnerAssignment"/>
		<module name="MissingSwitchDefault"/>
		<module name="MultipleVariableDeclarations"/>
		<module name="NestedForDepth">
			<property name="max" value="3"/>
		</module>
		<module name="NestedIfDepth">
			<property name="max" value="3"/>
		</module>
		<module name="NestedTryDepth">
			<property name="max" value="3"/>
		</module>
		<module name="NoFinalizer"/>
		<module name="OneStatementPerLine">
			<property name="treatTryResourcesAsStatement" value="true"/>
		</module>
		<module name="PackageDeclaration"/>
		<module name="SimplifyBooleanExpression"/>
		<module name="SimplifyBooleanReturn"/>
		<module name="StringLiteralEquality"/>
		<module name="SuperClone"/>
		<module name="SuperFinalize"/>
		<module name="UnnecessaryParentheses"/>
		<module name="UnnecessarySemicolonAfterOuterTypeDeclaration"/>
		<module name="UnnecessarySemicolonAfterTypeMemberDeclaration"/>
		<module name="UnnecessarySemicolonInEnumeration"/>
		<module name="UnnecessarySemicolonInTryWithResources"/>
		<module name="UnusedLocalVariable"/>

		<!-- Imports -->
		<module name="AvoidStarImport"/>
		<module name="IllegalImport">
			<property name="illegalPkgs" value="sun, sunw, com.oracle, com.sun"/>
		</module>
		<module name="ImportOrder">
			<property name="option" value="top"/>
			<property name="groups" value="java,javax,jakarta,org,com,nl"/>
			<property name="separated" value="true"/>
			<property name="ordered" value="true"/>
			<property name="separatedStaticGroups" value="true"/>
			<property name="sortStaticImportsAlphabetically" value="true"/>
		</module>
		<module name="RedundantImport"/>
		<module name="UnusedImports"/>

		<!-- Javadoc Comments -->
		<module name="AtclauseOrder"/>
		<module name="InvalidJavadocPosition"/>
		<module name="JavadocBlockTagLocation"/>
		<module name="JavadocContentLocation"/>
		<module name="JavadocMethod">
			<property name="accessModifiers" value="public,protected"/>
			<property name="allowMissingParamTags" value="true"/>
			<property name="allowMissingReturnTag" value="true"/>
		</module>
		<module name="JavadocMissingLeadingAsterisk"/>
		<module name="JavadocMissingWhitespaceAfterAsterisk"/>
		<module name="JavadocStyle">
			<property name="scope" value="protected"/>
			<property name="checkFirstSentence" value="false"/>
		</module>
		<module name="JavadocType">
			<property name="excludeScope" value="anoninner"/>
			<property name="authorFormat" value="^.+ .+$"/>
			<property name="versionFormat" value="^\d+\.\d+"/>
		</module>
		<module name="NonEmptyAtclauseDescription"/>
		<module name="RequireEmptyLineBeforeBlockTagGroup"/>

		<!-- Miscellaneous -->
		<module name="ArrayTypeStyle"/>
		<module name="CommentsIndentation"/>
		<module name="Indentation">
			<property name="arrayInitIndent" value="8"/>
			<property name="lineWrappingIndentation" value="8"/>
			<property name="caseIndent" value="0"/>
		</module>
		<module name="NoCodeInFile"/>
		<module name="OuterTypeFilename"/>
		<module name="UpperEll"/>

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

		<!-- Naming Conventions -->
		<module name="ClassTypeParameterName">
			<property name="format" value="^[A-Z][A-Z0-9]{0,2}$"/>
		</module>
		<module name="ConstantName">
			<property name="format" value="^[A-Z][A-Z0-9]*(_[A-Z0-9]+)*|uiClassID$"/>
		</module>
		<module name="InterfaceTypeParameterName">
			<property name="format" value="^[A-Z][A-Z0-9]{0,2}$"/>
		</module>
		<module name="LambdaParameterName"/>
		<module name="LocalFinalVariableName"/>
		<module name="LocalVariableName"/>
		<module name="MemberName"/>
		<module name="MethodName"/>
		<module name="MethodTypeParameterName"/>
		<module name="PackageName"/>
		<module name="ParameterName"/>
		<module name="PatternVariableName"/>
		<module name="RecordComponentName"/>
		<module name="RecordTypeParameterName"/>
		<module name="StaticVariableName"/>
		<module name="TypeName"/>

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

		<!-- Whitespace -->
		<module name="EmptyForInitializerPad">
			<property name="option" value="space"/>
		</module>
		<module name="EmptyForIteratorPad">
			<property name="option" value="space"/>
		</module>
		<module name="EmptyLineSeparator">
			<property name="allowNoEmptyLineBetweenFields" value="true"/>
			<property name="allowMultipleEmptyLines" value="false"/>
			<property name="allowMultipleEmptyLinesInsideClassMembers" value="false"/>
		</module>
		<module name="GenericWhitespace"/>
		<module name="MethodParamPad"/>
		<module name="NoLineWrap"/>
		<module name="NoWhitespaceAfter">
			<property name="tokens" value="AT,INC,DEC,UNARY_MINUS,UNARY_PLUS,BNOT,LNOT,DOT,ARRAY_DECLARATOR,INDEX_OP,METHOD_REF"/>
		</module>
		<module name="NoWhitespaceBefore">
			<property name="allowLineBreaks" value="true"/>
		</module>
		<module name="NoWhitespaceBeforeCaseDefaultColon"/>
		<module name="OperatorWrap"/>
		<module name="ParenPad"/>
		<module name="SeparatorWrap">
			<property name="option" value="nl"/>
			<property name="tokens" value="DOT,AT,METHOD_REF"/>
		</module>
		<module name="SeparatorWrap">
			<property name="option" value="eol"/>
			<property name="tokens" value="COMMA,ELLIPSIS"/>
		</module>
		<module name="TypecastParenPad"/>
		<module name="WhitespaceAfter"/>
		<module name="WhitespaceAround">
			<property name="ignoreEnhancedForColon" value="false"/>
		</module>
	</module>

	<!-- Miscellaneous -->
	<module name="NewlineAtEndOfFile"/>
	<module name="Translation"/>
	<module name="UniqueProperties"/>

	<!-- Disable name checks for generated code -->
	<module name="SuppressionSingleFilter">
		<property name="files" value="src[\\/]main[\\/]generated[\\/].*"/>
		<property name="checks" value="MemberName|MethodName"/>
	</module>

	<!-- Allow unused variables in examples -->
	<module name="SuppressionSingleFilter">
		<property name="files" value="src[\\/]examples[\\/]java[\\/].*"/>
		<property name="checks" value="UnusedLocalVariable"/>
	</module>
</module>