config/suppressions.xml

<?xml version="1.0"?>

<!DOCTYPE suppressions PUBLIC
    "-//Puppy Crawl//DTD Suppressions 1.2//EN"
    "http://checkstyle.sourceforge.net/dtds/suppressions_1_2.dtd">

<suppressions>
    <suppress checks="FileLength"
              files="TokenTypes.java|IndentationCheckTest.java"
              lines="1"/>

    <!-- illegal words are part of Javadoc -->
    <suppress checks="TodoComment" files=".*TodoCommentCheck\.java"/>

    <!-- All disallowed characters are stored there -->
    <suppress checks="AvoidEscapedUnicodeCharactersCheck"
              files="AvoidEscapedUnicodeCharactersCheck.java"/>

    <!-- 'Abstract' pattern is used to show it is checking for abstract class name -->
    <suppress checks="AbstractClassNameCheck"
              files="AbstractClassNameCheck.java"/>
    <!-- test should be named as their main class -->
    <suppress checks="AbstractClassNameCheck"
              files="AbstractCheckTest.java|AbstractClassNameCheckTest.java|AbstractTypeAwareCheckTest.java|AbstractJavadocCheckTest.java|AbstractViolationReporterTest.java|AbstractFileSetCheckTest.java|AbstractNodeTest.java"/>

    <!-- Tone down the checking for test code -->
    <suppress checks="CyclomaticComplexity" files="[\\/]XdocsPagesTest\.java"/>
    <suppress checks="NPathComplexity" files="[\\/]XdocsPagesTest\.java"/>
    <suppress checks="IllegalCatch" files="[\\/]internal[\\/].*[\\/]\w+Util\.java"/>
    <suppress checks="EmptyBlock" files=".*[\\/]src[\\/]test[\\/]"/>
    <suppress message="Missing a Javadoc comment|Missing package-info.java file|Expected @throws tag for|missing an @author tag" files=".*[\\/]src[\\/](test|it)[\\/]"/>
    <suppress checks="MagicNumber" files=".*[\\/]src[\\/](test|it)[\\/]"/>
    <suppress checks="AvoidStaticImport" files=".*[\\/]src[\\/](test|it)[\\/]"/>
    <suppress checks="ClassDataAbstractionCoupling" files="[\\/]IndentationCheckTest.java$|[\\/]SuppressWithNearbyCommentFilterTest.java$|[\\/]SuppressionCommentFilterTest.java|[\\/]DetailASTTest.java$"/>
    <suppress checks="EqualsAvoidNull" files="[\\/]Int.*FilterTest.java$"/>
    <suppress checks="VisibilityModifier" files="[\\/]AbstractModuleTestSupport.java$"/>
    <suppress checks="WriteTag" files=".*[\\/]src[\\/](test|it)[\\/]"/>
    <suppress checks="MethodCount" files=".*[\\/]src[\\/](test|it)[\\/]"/>

    <!--The Check generates too many violations, fixing them will make code unmanageable.-->
    <suppress checks="MagicNumber" files="(ParseTreeTablePresentation|MainFrame)\.java"/>

    <!-- Methods that build fake AST are very long-->
    <suppress checks="MethodLength" files="src[\\/]test[\\/]java[\\/]com[\\/]puppycrawl[\\/]tools[\\/]checkstyle[\\/]grammars[\\/]comments[\\/]CommentsTest\.java"/>
    <suppress checks="ExecutableStatementCount" files="src[\\/]test[\\/]java[\\/]com[\\/]puppycrawl[\\/]tools[\\/]checkstyle[\\/]grammars[\\/]comments[\\/]CommentsTest\.java"/>
    <suppress checks="JavaNCSS" files="src[\\/]test[\\/]java[\\/]com[\\/]puppycrawl[\\/]tools[\\/]checkstyle[\\/]grammars[\\/]comments[\\/]CommentsTest\.java"/>
    <suppress checks="MethodLength" files=".*(Generated)?Java(doc)?TokenTypesTest\.java"/>
    <suppress checks="ExecutableStatementCount" files=".*(Generated)?Java(doc)?TokenTypesTest\.java"/>
    <suppress checks="JavaNCSS" files=".*(Generated)?Java(doc)?TokenTypesTest\.java"/>
    <suppress checks="ExecutableStatementCount" files=".*IllegalInstantiationCheckTest\.java"/>
    <suppress checks="ExecutableStatementCount" files=".*Main\.java"/>

    <!-- till https://github.com/checkstyle/checkstyle/issues/4983 -->
    <suppress checks="MissingDeprecated" files=".*JavadocTokenTypes\.java"/>

    <!-- Till https://github.com/checkstyle/checkstyle/issues/1854 -->
    <suppress checks="TrailingComment" files="(InnerAssignmentCheck\.java|OperatorWrapCheck\.java|XMLLoggerTest\.java|AbbreviationAsWordInNameCheckTest\.java)"/>

    <!-- Fixing these cases will decrease code readability -->
    <suppress checks="MultipleStringLiterals" files="JavadocStyleCheck\.java|AbstractTypeAwareCheck\.java|XMLLogger\.java"/>
    <suppress checks="MultipleStringLiterals" files=".*[\\/]src[\\/](test|it)[\\/]"/>

    <!-- There are a lot of setters/getters in the Check. A small number of methods is left for Check's logic -->
    <suppress checks="MethodCount" files="[\\/]JavadocMethodCheck.java$"/>
    <!-- Apart from a complex logic there is a lot of small methods for a better readability.  -->
    <suppress checks="MethodCount" files="[\\/]CommentsIndentationCheck.java$"/>
    <!--VisibilityModifierCheck has 7 options which require 7 additional methods (setters)-->
    <suppress checks="MethodCount" files="[\\/]VisibilityModifierCheck.java$"/>
    <!--RequireThisCheck has a hierarchy of nested classes which contains a lot of methods. -->
    <suppress checks="MethodCount" files="[\\/]RequireThisCheck.java$"/>

    <!-- we need that set of converters -->
    <suppress checks="ClassDataAbstractionCoupling" files="AutomaticBean\.java"/>
    <!-- they are aggregators of logic, usage a several of classes are ok -->
    <suppress checks="ClassDataAbstractionCoupling" files="(Checker|TreeWalker|Main|CheckstyleAntTask|JavadocDetailNodeParser)\.java"/>
    <suppress checks="ClassDataAbstractionCoupling" files="(CheckerTest|TreeWalkerTest|AbstractModuleTestSupport|XdocsPagesTest|CheckstyleAntTaskTest)\.java"/>
    <suppress checks="ClassDataAbstractionCoupling" files="PropertyCacheFile\.java"/>
    <suppress checks="ClassDataAbstractionCoupling" files="PropertyCacheFileTest\.java"/>
    <suppress checks="ClassFanOutComplexity" files="[\\/]Main\.java"/>
    <suppress checks="ClassFanOutComplexity" files="CheckstyleAntTask\.java"/>
    <suppress checks="ClassFanOutComplexity" files="CheckerTest\.java"/>
    <!-- a lot of GUI elements is OK -->
    <suppress checks="ClassDataAbstractionCoupling" files="(TreeTable|MainFrame)\.java"/>

    <!-- Should be fixed after moving https://github.com/sevntu-checkstyle/sevntu.checkstyle/blob/master/sevntu-checks/src/main/java/com/github/sevntu/checkstyle/checks/coding/ReturnCountExtendedCheck.java into the main repo, to allow skip guard sentences(or by topLinesToIgnoreCount) -->
    <suppress checks="ReturnCount" files="(ConfigurationLoader|LambdaHandler)\.java"/>

    <!-- Suppressions from PMD configuration-->
    <!-- JavadocMethodCheck, JavadocStyleCheck, JavadocUtils.getJavadocTags() - deprecated -->
    <suppress checks="CyclomaticComplexity" files="JavadocMethodCheck\.java"/>
    <suppress checks="CyclomaticComplexity" files="JavadocStyleCheck\.java"/>
    <suppress checks="CyclomaticComplexity" files="CustomImportOrderCheck\.java"/>

    <!-- HandlerFactory crosses allowed limit for executable statements -->
    <suppress checks="ExecutableStatementCount" files="HandlerFactory\.java"/>
</suppressions>