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">
    <!--
      If you set the basedir property below, then all reported file
      names will be relative to the specified directory. See
      https://checkstyle.org/config.html#Checker

      <property name="basedir" value="${basedir}"/>
  -->
    <property name="severity" value="error"/>
    <property name="fileExtensions" value="java, properties, xml"/>
    <!-- Excludes all 'module-info.java' files              -->
    <!-- See https://checkstyle.org/config_filefilters.html -->
    <module name="BeforeExecutionExclusionFileFilter">
        <property name="fileNamePattern" value="module\-info\.java$"/>
    </module>
    <!-- https://checkstyle.org/config_filters.html#SuppressionFilter -->
    <module name="SuppressionFilter">
        <property name="file" value="${org.checkstyle.sun.suppressionfilter.config}" default="checkstyle-suppressions.xml"/>
        <property name="optional" value="true"/>
    </module>
    <!-- Checks that a package-info.java file exists for each package.     -->
    <!-- See https://checkstyle.org/config_javadoc.html#JavadocPackage -->
    <!--  <module name="JavadocPackage"/> -->
    <!-- Checks whether files end with a new line.                        -->
    <!-- See https://checkstyle.org/config_misc.html#NewlineAtEndOfFile -->
    <module name="NewlineAtEndOfFile"/>
    <!-- Checks that property files contain the same keys.         -->
    <!-- See https://checkstyle.org/config_misc.html#Translation -->
    <module name="Translation"/>
    <!-- Checks for Size Violations.                    -->
    <!-- See https://checkstyle.org/config_sizes.html -->
    <module name="FileLength"/>
    <module name="LineLength">
        <property name="max" value="128"/>
        <property name="fileExtensions" value="java"/>
        <property name="ignorePattern" value="^(package|import) .*"/>
    </module>
    <!-- Checks for whitespace                               -->
    <!-- See https://checkstyle.org/config_whitespace.html -->
    <module name="FileTabCharacter"/>
    <!-- Miscellaneous other checks.                   -->
    <!-- See https://checkstyle.org/config_misc.html -->
    <!-- Checks for Headers                                -->
    <!-- See https://checkstyle.org/config_header.html   -->
    <!-- <module name="Header"> -->
    <!--   <property name="headerFile" value="${checkstyle.header.file}"/> -->
    <!--   <property name="fileExtensions" value="java"/> -->
    <!-- </module> -->
    <module name="TreeWalker">
        <!-- Checks for Javadoc comments.                     -->
        <!-- See https://checkstyle.org/config_javadoc.html -->
        <module name="InvalidJavadocPosition"/>
        <!-- <module name="JavadocMethod"/> -->
        <module name="JavadocType"/>
        <!-- <module name="JavadocVariable"/> -->
        <module name="JavadocStyle"/>
        <!-- <module name="MissingJavadocMethod"/> -->
        <!-- Checks for Naming Conventions.                  -->
        <!-- See https://checkstyle.org/config_naming.html -->
        <module name="ConstantName"/>
        <module name="LocalFinalVariableName"/>
        <module name="LocalVariableName"/>
        <module name="MemberName"/>
        <module name="MethodName"/>
        <module name="PackageName"/>
        <module name="ParameterName"/>
        <module name="StaticVariableName"/>
        <module name="TypeName"/>
        <!-- Checks for imports                              -->
        <!-- See https://checkstyle.org/config_imports.html -->
        <module name="AvoidStarImport"/>
        <module name="IllegalImport"/>
        <!-- defaults to sun.* packages -->
        <module name="RedundantImport"/>
        <module name="UnusedImports">
            <property name="processJavadoc" value="false"/>
        </module>
        <!-- Checks for Size Violations.                    -->
        <!-- See https://checkstyle.org/config_sizes.html -->
        <module name="MethodLength"/>
        <module name="ParameterNumber"/>
        <!-- Checks for whitespace                               -->
        <!-- See https://checkstyle.org/config_whitespace.html -->
        <module name="EmptyForIteratorPad"/>
        <!-- <module name="GenericWhitespace"/> -->
        <module name="MethodParamPad"/>
        <!-- <module name="NoWhitespaceAfter"/> -->
        <module name="NoWhitespaceBefore"/>
        <module name="OperatorWrap"/>
        <module name="ParenPad"/>
        <module name="TypecastParenPad"/>
        <module name="WhitespaceAfter"/>
        <module name="WhitespaceAround"/>
        <!-- Modifier Checks                                    -->
        <!-- See https://checkstyle.org/config_modifiers.html -->
        <module name="ModifierOrder"/>
        <module name="RedundantModifier"/>
        <!-- Checks for blocks. You know, those {}'s         -->
        <!-- See https://checkstyle.org/config_blocks.html -->
        <module name="AvoidNestedBlocks"/>
        <module name="EmptyBlock"/>
        <module name="LeftCurly"/>
        <module name="NeedBraces"/>
        <module name="RightCurly"/>
        <!-- Checks for common coding problems               -->
        <!-- See https://checkstyle.org/config_coding.html -->
        <module name="EmptyStatement"/>
        <module name="EqualsHashCode"/>
        <!-- <module name="HiddenField"/> -->
        <module name="IllegalInstantiation"/>
        <module name="InnerAssignment"/>
        <module name="MagicNumber"/>
        <module name="MissingSwitchDefault"/>
        <module name="MultipleVariableDeclarations"/>
        <module name="SimplifyBooleanExpression"/>
        <module name="SimplifyBooleanReturn"/>
        <!-- Checks for class design                         -->
        <!-- See https://checkstyle.org/config_design.html -->
        <!-- <module name="DesignForExtension"/> -->
        <module name="FinalClass"/>
        <module name="HideUtilityClassConstructor"/>
        <module name="InterfaceIsType"/>
        <!-- <module name="VisibilityModifier"/> -->
        <!-- Miscellaneous other checks.                   -->
        <!-- See https://checkstyle.org/config_misc.html -->
        <module name="ArrayTypeStyle"/>
        <!-- <module name="FinalParameters"/> -->
        <!-- <module name="TodoComment"/>  -->
        <module name="UpperEll"/>
        <!-- https://checkstyle.org/config_filters.html#SuppressionXpathFilter -->
        <module name="SuppressionXpathFilter">
            <property name="file" value="${org.checkstyle.sun.suppressionxpathfilter.config}" default="checkstyle-xpath-suppressions.xml"/>
            <property name="optional" value="true"/>
        </module>
        <!-- See: https://checkstyle.sourceforge.io/apidocs/com/puppycrawl/tools/checkstyle/checks/whitespace/EmptyLineSeparatorCheck.html  -->
        <module name="EmptyLineSeparator">
            <property name="allowNoEmptyLineBetweenFields" value="true"/>
            <property name="allowMultipleEmptyLines" value="false"/>
        </module>
        <!-- See: https://checkstyle.sourceforge.io/apidocs/com/puppycrawl/tools/checkstyle/checks/coding/DeclarationOrderCheck.html -->
        <module name="DeclarationOrder"/>
        <!-- See: https://checkstyle.org/config_coding.html#OverloadMethodsDeclarationOrder -->
        <module name="OverloadMethodsDeclarationOrder"/>
    </module>
</module>