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Checkstyle is a development tool to help programmers write Java code
that adheres to a coding standard
The newest version!
<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
"-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
"https://checkstyle.org/dtds/configuration_1_3.dtd">
<!--
Checkstyle configuration that checks the Google coding conventions from Google Java Style
that can be found at https://google.github.io/styleguide/javaguide.html
Checkstyle is very configurable. Be sure to read the documentation at
http://checkstyle.org (or in your downloaded distribution).
To completely disable a check, just comment it out or delete it from the file.
To suppress certain violations please review suppression filters.
Authors: Max Vetrenko, Mauryan Kansara, Ruslan Diachenko, Roman Ivanov.
-->
<module name="Checker">
<property name="charset" value="UTF-8"/>
<property name="severity" value="${org.checkstyle.google.severity}" default="warning"/>
<property name="fileExtensions" value="java, properties, xml"/>
<!-- Excludes all 'module-info.java' files -->
<!-- See https://checkstyle.org/filefilters/index.html -->
<module name="BeforeExecutionExclusionFileFilter">
<property name="fileNamePattern" value="module\-info\.java$"/>
</module>
<module name="SuppressWarningsFilter"/>
<!-- https://checkstyle.org/filters/suppressionfilter.html -->
<module name="SuppressionFilter">
<property name="file" value="${org.checkstyle.google.suppressionfilter.config}"
default="checkstyle-suppressions.xml" />
<property name="optional" value="true"/>
</module>
<!-- https://checkstyle.org/filters/suppresswithnearbytextfilter.html -->
<module name="SuppressWithNearbyTextFilter">
<property name="nearbyTextPattern"
value="CHECKSTYLE.SUPPRESS\: (\w+) for ([+-]\d+) lines"/>
<property name="checkPattern" value="$1"/>
<property name="lineRange" value="$2"/>
</module>
<!-- Checks for whitespace -->
<!-- See http://checkstyle.org/checks/whitespace/index.html -->
<module name="FileTabCharacter">
<property name="eachLine" value="true"/>
</module>
<module name="LineLength">
<property name="fileExtensions" value="java"/>
<property name="max" value="100"/>
<property name="ignorePattern"
value="^package.*|^import.*|href\s*=\s*"[^"]*"|http://|https://|ftp://"/>
</module>
<module name="TreeWalker">
<module name="OuterTypeFilename"/>
<module name="IllegalTokenText">
<property name="tokens" value="STRING_LITERAL, CHAR_LITERAL"/>
<property name="format"
value="\\u00(09|0(a|A)|0(c|C)|0(d|D)|22|27|5(C|c))|\\(0(10|11|12|14|15|42|47)|134)"/>
<property name="message"
value="Consider using special escape sequence instead of octal value or Unicode escaped value."/>
</module>
<module name="AvoidEscapedUnicodeCharacters">
<property name="allowEscapesForControlCharacters" value="true"/>
<property name="allowByTailComment" value="true"/>
<property name="allowNonPrintableEscapes" value="true"/>
</module>
<module name="AvoidStarImport"/>
<module name="OneTopLevelClass"/>
<module name="NoLineWrap">
<property name="tokens" value="PACKAGE_DEF, IMPORT, STATIC_IMPORT"/>
</module>
<module name="NeedBraces">
<property name="tokens"
value="LITERAL_DO, LITERAL_ELSE, LITERAL_FOR, LITERAL_IF, LITERAL_WHILE"/>
</module>
<module name="LeftCurly">
<property name="id" value="LeftCurlyEol"/>
<property name="tokens"
value="ANNOTATION_DEF, CLASS_DEF, CTOR_DEF, ENUM_CONSTANT_DEF, ENUM_DEF,
INTERFACE_DEF, LAMBDA, LITERAL_CATCH,
LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY, LITERAL_FOR, LITERAL_IF,
LITERAL_SWITCH, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_WHILE, METHOD_DEF,
OBJBLOCK, STATIC_INIT, RECORD_DEF, COMPACT_CTOR_DEF"/>
</module>
<module name="LeftCurly">
<property name="id" value="LeftCurlyNl"/>
<property name="option" value="nl"/>
<property name="tokens"
value="LITERAL_CASE, LITERAL_DEFAULT"/>
</module>
<module name="SuppressionXpathSingleFilter">
<!-- LITERAL_CASE, LITERAL_DEFAULT are reused in SWITCH_RULE -->
<property name="id" value="LeftCurlyNl"/>
<property name="query" value="//SWITCH_RULE/SLIST"/>
</module>
<module name="RightCurly">
<property name="id" value="RightCurlySame"/>
<property name="tokens"
value="LITERAL_TRY, LITERAL_CATCH, LITERAL_IF, LITERAL_ELSE,
LITERAL_DO"/>
</module>
<module name="RightCurly">
<property name="id" value="RightCurlyAlone"/>
<property name="option" value="alone"/>
<property name="tokens"
value="CLASS_DEF, METHOD_DEF, CTOR_DEF, LITERAL_FOR, LITERAL_WHILE, STATIC_INIT,
INSTANCE_INIT, ANNOTATION_DEF, ENUM_DEF, INTERFACE_DEF, RECORD_DEF,
COMPACT_CTOR_DEF, LITERAL_SWITCH, LITERAL_CASE, LITERAL_FINALLY"/>
</module>
<module name="SuppressionXpathSingleFilter">
<!-- suppression is required till https://github.com/checkstyle/checkstyle/issues/7541 -->
<property name="id" value="RightCurlyAlone"/>
<property name="query" value="//RCURLY[parent::SLIST[count(./*)=1]
or preceding-sibling::*[last()][self::LCURLY]]"/>
</module>
<module name="WhitespaceAfter">
<property name="tokens"
value="COMMA, SEMI, TYPECAST, LITERAL_IF, LITERAL_ELSE, LITERAL_RETURN,
LITERAL_WHILE, LITERAL_DO, LITERAL_FOR, LITERAL_FINALLY, DO_WHILE, ELLIPSIS,
LITERAL_SWITCH, LITERAL_SYNCHRONIZED, LITERAL_TRY, LITERAL_CATCH, LAMBDA,
LITERAL_YIELD, LITERAL_CASE, LITERAL_WHEN"/>
</module>
<module name="WhitespaceAround">
<property name="allowEmptyConstructors" value="true"/>
<property name="allowEmptyLambdas" value="true"/>
<property name="allowEmptyMethods" value="true"/>
<property name="allowEmptyTypes" value="true"/>
<property name="allowEmptyLoops" value="true"/>
<property name="allowEmptySwitchBlockStatements" value="true"/>
<property name="ignoreEnhancedForColon" value="false"/>
<property name="tokens"
value="ASSIGN, BAND, BAND_ASSIGN, BOR, BOR_ASSIGN, BSR, BSR_ASSIGN, BXOR,
BXOR_ASSIGN, COLON, DIV, DIV_ASSIGN, DO_WHILE, EQUAL, GE, GT, LAMBDA, LAND,
LCURLY, LE, LITERAL_CATCH, LITERAL_DO, LITERAL_ELSE, LITERAL_FINALLY,
LITERAL_FOR, LITERAL_IF, LITERAL_RETURN, LITERAL_SWITCH, LITERAL_SYNCHRONIZED,
LITERAL_TRY, LITERAL_WHILE, LOR, LT, MINUS, MINUS_ASSIGN, MOD, MOD_ASSIGN,
NOT_EQUAL, PLUS, PLUS_ASSIGN, QUESTION, RCURLY, SL, SLIST, SL_ASSIGN, SR,
SR_ASSIGN, STAR, STAR_ASSIGN, LITERAL_ASSERT,
TYPE_EXTENSION_AND, LITERAL_WHEN"/>
<message key="ws.notFollowed"
value="WhitespaceAround: ''{0}'' is not followed by whitespace. Empty blocks
may only be represented as '{}' when not part of a multi-block statement (4.1.3)"/>
<message key="ws.notPreceded"
value="WhitespaceAround: ''{0}'' is not preceded with whitespace."/>
</module>
<module name="SuppressionXpathSingleFilter">
<property name="checks" value="WhitespaceAround"/>
<property name="query" value="//*[self::LITERAL_IF or self::LITERAL_ELSE or self::STATIC_INIT
or self::LITERAL_TRY or self::LITERAL_CATCH]/SLIST[count(./*)=1]
| //*[self::STATIC_INIT or self::LITERAL_TRY or self::LITERAL_IF]
//*[self::RCURLY][parent::SLIST[count(./*)=1]]"/>
</module>
<module name="RegexpSinglelineJava">
<property name="format" value="\{[ ]+\}"/>
<property name="message" value="Empty blocks should have no spaces. Empty blocks
may only be represented as '{}' when not part of a
multi-block statement (4.1.3)"/>
</module>
<module name="OneStatementPerLine"/>
<module name="MultipleVariableDeclarations"/>
<module name="ArrayTypeStyle"/>
<module name="MissingSwitchDefault"/>
<module name="FallThrough"/>
<module name="UpperEll"/>
<module name="ModifierOrder"/>
<module name="EmptyLineSeparator">
<property name="tokens"
value="PACKAGE_DEF, IMPORT, STATIC_IMPORT, CLASS_DEF, INTERFACE_DEF, ENUM_DEF,
STATIC_INIT, INSTANCE_INIT, METHOD_DEF, CTOR_DEF, VARIABLE_DEF, RECORD_DEF,
COMPACT_CTOR_DEF"/>
<property name="allowNoEmptyLineBetweenFields" value="true"/>
</module>
<module name="SeparatorWrap">
<property name="id" value="SeparatorWrapDot"/>
<property name="tokens" value="DOT"/>
<property name="option" value="nl"/>
</module>
<module name="SeparatorWrap">
<property name="id" value="SeparatorWrapComma"/>
<property name="tokens" value="COMMA"/>
<property name="option" value="EOL"/>
</module>
<module name="SeparatorWrap">
<!-- ELLIPSIS is EOL until https://github.com/google/styleguide/issues/259 -->
<property name="id" value="SeparatorWrapEllipsis"/>
<property name="tokens" value="ELLIPSIS"/>
<property name="option" value="EOL"/>
</module>
<module name="SeparatorWrap">
<!-- ARRAY_DECLARATOR is EOL until https://github.com/google/styleguide/issues/258 -->
<property name="id" value="SeparatorWrapArrayDeclarator"/>
<property name="tokens" value="ARRAY_DECLARATOR"/>
<property name="option" value="EOL"/>
</module>
<module name="SeparatorWrap">
<property name="id" value="SeparatorWrapMethodRef"/>
<property name="tokens" value="METHOD_REF"/>
<property name="option" value="nl"/>
</module>
<module name="PackageName">
<property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
<message key="name.invalidPattern"
value="Package name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="TypeName">
<property name="tokens" value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF,
ANNOTATION_DEF, RECORD_DEF"/>
<message key="name.invalidPattern"
value="Type name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="MemberName">
<property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9]*$"/>
<message key="name.invalidPattern"
value="Member name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="ParameterName">
<property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
<message key="name.invalidPattern"
value="Parameter name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="LambdaParameterName">
<property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
<message key="name.invalidPattern"
value="Lambda parameter name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="CatchParameterName">
<property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
<message key="name.invalidPattern"
value="Catch parameter name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="LocalVariableName">
<property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
<message key="name.invalidPattern"
value="Local variable name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="PatternVariableName">
<property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
<message key="name.invalidPattern"
value="Pattern variable name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="ClassTypeParameterName">
<property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
<message key="name.invalidPattern"
value="Class type name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="RecordComponentName">
<property name="format" value="^[a-z]([a-z0-9][a-zA-Z0-9]*)?$"/>
<message key="name.invalidPattern"
value="Record component name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="RecordTypeParameterName">
<property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
<message key="name.invalidPattern"
value="Record type name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="MethodTypeParameterName">
<property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
<message key="name.invalidPattern"
value="Method type name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="InterfaceTypeParameterName">
<property name="format" value="(^[A-Z][0-9]?)$|([A-Z][a-zA-Z0-9]*[T]$)"/>
<message key="name.invalidPattern"
value="Interface type name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="NoFinalizer"/>
<module name="GenericWhitespace">
<message key="ws.followed"
value="GenericWhitespace ''{0}'' is followed by whitespace."/>
<message key="ws.preceded"
value="GenericWhitespace ''{0}'' is preceded with whitespace."/>
<message key="ws.illegalFollow"
value="GenericWhitespace ''{0}'' should followed by whitespace."/>
<message key="ws.notPreceded"
value="GenericWhitespace ''{0}'' is not preceded with whitespace."/>
</module>
<module name="Indentation">
<property name="basicOffset" value="2"/>
<property name="braceAdjustment" value="2"/>
<property name="caseIndent" value="2"/>
<property name="throwsIndent" value="4"/>
<property name="lineWrappingIndentation" value="4"/>
<property name="arrayInitIndent" value="2"/>
</module>
<!-- Suppression for block code until we find a way to detect them properly
until https://github.com/checkstyle/checkstyle/issues/15769 -->
<module name="SuppressionXpathSingleFilter">
<property name="checks" value="Indentation"/>
<property name="query" value="//SLIST[not(parent::CASE_GROUP)]/SLIST
| //SLIST[not(parent::CASE_GROUP)]/SLIST/RCURLY"/>
</module>
<module name="AbbreviationAsWordInName">
<property name="ignoreFinal" value="false"/>
<property name="allowedAbbreviationLength" value="0"/>
<property name="tokens"
value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, ANNOTATION_DEF, ANNOTATION_FIELD_DEF,
PARAMETER_DEF, VARIABLE_DEF, METHOD_DEF, PATTERN_VARIABLE_DEF, RECORD_DEF,
RECORD_COMPONENT_DEF"/>
</module>
<module name="NoWhitespaceBeforeCaseDefaultColon"/>
<module name="OverloadMethodsDeclarationOrder"/>
<module name="ConstructorsDeclarationGrouping"/>
<module name="VariableDeclarationUsageDistance"/>
<module name="CustomImportOrder">
<property name="sortImportsInGroupAlphabetically" value="true"/>
<property name="separateLineBetweenGroups" value="true"/>
<property name="customImportOrderRules" value="STATIC###THIRD_PARTY_PACKAGE"/>
<property name="tokens" value="IMPORT, STATIC_IMPORT, PACKAGE_DEF"/>
</module>
<module name="MethodParamPad">
<property name="tokens"
value="CTOR_DEF, LITERAL_NEW, METHOD_CALL, METHOD_DEF, CTOR_CALL,
SUPER_CTOR_CALL, ENUM_CONSTANT_DEF, RECORD_DEF, RECORD_PATTERN_DEF"/>
</module>
<module name="NoWhitespaceBefore">
<property name="tokens"
value="COMMA, SEMI, POST_INC, POST_DEC, DOT,
LABELED_STAT, METHOD_REF"/>
<property name="allowLineBreaks" value="true"/>
</module>
<module name="ParenPad">
<property name="tokens"
value="ANNOTATION, ANNOTATION_FIELD_DEF, CTOR_CALL, CTOR_DEF, DOT, ENUM_CONSTANT_DEF,
EXPR, LITERAL_CATCH, LITERAL_DO, LITERAL_FOR, LITERAL_IF, LITERAL_NEW,
LITERAL_SWITCH, LITERAL_SYNCHRONIZED, LITERAL_WHILE, METHOD_CALL,
METHOD_DEF, QUESTION, RESOURCE_SPECIFICATION, SUPER_CTOR_CALL, LAMBDA,
RECORD_DEF, RECORD_PATTERN_DEF"/>
</module>
<module name="OperatorWrap">
<property name="option" value="NL"/>
<property name="tokens"
value="BAND, BOR, BSR, BXOR, DIV, EQUAL, GE, GT, LAND, LE, LITERAL_INSTANCEOF, LOR,
LT, MINUS, MOD, NOT_EQUAL, PLUS, QUESTION, SL, SR, STAR, METHOD_REF,
TYPE_EXTENSION_AND "/>
</module>
<module name="AnnotationLocation">
<property name="id" value="AnnotationLocationMostCases"/>
<property name="tokens"
value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF,
RECORD_DEF, COMPACT_CTOR_DEF"/>
</module>
<module name="AnnotationLocation">
<property name="id" value="AnnotationLocationVariables"/>
<property name="tokens" value="VARIABLE_DEF"/>
<property name="allowSamelineMultipleAnnotations" value="true"/>
</module>
<module name="NonEmptyAtclauseDescription"/>
<module name="InvalidJavadocPosition"/>
<module name="JavadocTagContinuationIndentation"/>
<module name="SummaryJavadoc">
<property name="forbiddenSummaryFragments"
value="^@return the *|^This method returns |^A [{]@code [a-zA-Z0-9]+[}]( is a )"/>
</module>
<module name="JavadocParagraph">
<property name="allowNewlineParagraph" value="false"/>
</module>
<module name="RequireEmptyLineBeforeBlockTagGroup"/>
<module name="AtclauseOrder">
<property name="tagOrder" value="@param, @return, @throws, @deprecated"/>
<property name="target"
value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF, METHOD_DEF, CTOR_DEF, VARIABLE_DEF"/>
</module>
<module name="JavadocMethod">
<property name="accessModifiers" value="public"/>
<property name="allowMissingParamTags" value="true"/>
<property name="allowMissingReturnTag" value="true"/>
<property name="allowedAnnotations" value="Override, Test"/>
<property name="tokens" value="METHOD_DEF, CTOR_DEF, ANNOTATION_FIELD_DEF, COMPACT_CTOR_DEF"/>
</module>
<module name="MissingJavadocMethod">
<property name="scope" value="protected"/>
<property name="allowMissingPropertyJavadoc" value="true"/>
<property name="allowedAnnotations" value="Override, Test"/>
<property name="tokens" value="METHOD_DEF, CTOR_DEF, ANNOTATION_FIELD_DEF,
COMPACT_CTOR_DEF"/>
</module>
<module name="SuppressionXpathSingleFilter">
<property name="checks" value="MissingJavadocMethod"/>
<property name="query" value="//*[self::METHOD_DEF or self::CTOR_DEF
or self::ANNOTATION_FIELD_DEF or self::COMPACT_CTOR_DEF]
[ancestor::*[self::INTERFACE_DEF or self::CLASS_DEF
or self::RECORD_DEF or self::ENUM_DEF]
[not(./MODIFIERS/LITERAL_PUBLIC)]]"/>
</module>
<module name="MissingJavadocType">
<property name="scope" value="protected"/>
<property name="tokens"
value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF,
RECORD_DEF, ANNOTATION_DEF"/>
<property name="excludeScope" value="nothing"/>
</module>
<module name="MethodName">
<property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9]*$"/>
<message key="name.invalidPattern"
value="Method name ''{0}'' must match pattern ''{1}''."/>
</module>
<module name="SuppressionXpathSingleFilter">
<property name="checks" value="MethodName"/>
<property name="query" value="//METHOD_DEF[
./MODIFIERS/ANNOTATION//IDENT[contains(@text, 'Test')]
]/IDENT"/>
<property name="message" value="'[a-z][a-z0-9][a-zA-Z0-9]*(?:_[a-z][a-z0-9][a-zA-Z0-9]*)*'"/>
</module>
<module name="SingleLineJavadoc"/>
<module name="EmptyCatchBlock">
<property name="exceptionVariableName" value="expected"/>
</module>
<module name="CommentsIndentation">
<property name="tokens" value="SINGLE_LINE_COMMENT, BLOCK_COMMENT_BEGIN"/>
</module>
<!-- https://checkstyle.org/filters/suppressionxpathfilter.html -->
<module name="SuppressionXpathFilter">
<property name="file" value="${org.checkstyle.google.suppressionxpathfilter.config}"
default="checkstyle-xpath-suppressions.xml" />
<property name="optional" value="true"/>
</module>
<module name="SuppressWarningsHolder" />
<module name="SuppressionCommentFilter">
<property name="offCommentFormat" value="CHECKSTYLE.OFF\: ([\w\|]+)" />
<property name="onCommentFormat" value="CHECKSTYLE.ON\: ([\w\|]+)" />
<property name="checkFormat" value="$1" />
</module>
<module name="SuppressWithNearbyCommentFilter">
<property name="commentFormat" value="CHECKSTYLE.SUPPRESS\: ([\w\|]+)"/>
<!-- $1 refers to the first match group in the regex defined in commentFormat -->
<property name="checkFormat" value="$1"/>
<!-- The check is suppressed in the next line of code after the comment -->
<property name="influenceFormat" value="1"/>
</module>
</module>
</module>