checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
        "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
        "https://www.puppycrawl.com/dtds/configuration_1_3.dtd">
<module name="com.puppycrawl.tools.checkstyle.Checker">

    <!-- TreeWalker Checks -->
    <module name="com.puppycrawl.tools.checkstyle.TreeWalker">
        <property name="tabWidth" value="1"/>

        <module name="SuppressionCommentFilter">
            <property name="offCommentFormat" value="@checkstyle:off"/>
            <property name="onCommentFormat" value="@checkstyle:on"/>
        </module>

        <module name="com.puppycrawl.tools.checkstyle.checks.annotation.MissingOverrideCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.annotation.PackageAnnotationCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.annotation.AnnotationLocationCheck">
            <property name="allowSamelineSingleParameterlessAnnotation"
                      value="false"/>
        </module>

        <!-- Block Checks -->
        <module name="com.puppycrawl.tools.checkstyle.checks.blocks.EmptyBlockCheck">
            <property name="option" value="text"/>
        </module>
        <module name="com.puppycrawl.tools.checkstyle.checks.blocks.LeftCurlyCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.blocks.RightCurlyCheck">
            <!--			<property name="option" value="alone"/>-->
        </module>
        <module name="com.puppycrawl.tools.checkstyle.checks.blocks.AvoidNestedBlocksCheck"/>

        <!-- Class Design -->
        <module name="com.puppycrawl.tools.checkstyle.checks.design.InnerTypeLastCheck"/>

        <!-- Coding -->
        <module name="com.puppycrawl.tools.checkstyle.checks.coding.CovariantEqualsCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.coding.EmptyStatementCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.coding.EqualsHashCodeCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.coding.SimplifyBooleanExpressionCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.coding.SimplifyBooleanReturnCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.coding.StringLiteralEqualityCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.coding.NestedForDepthCheck">
            <property name="max" value="3"/>
        </module>
        <module name="com.puppycrawl.tools.checkstyle.checks.coding.NestedIfDepthCheck">
            <property name="max" value="5"/>
        </module>
        <module name="com.puppycrawl.tools.checkstyle.checks.coding.NestedTryDepthCheck">
            <property name="max" value="3"/>
        </module>
        <module name="com.puppycrawl.tools.checkstyle.checks.coding.OneStatementPerLineCheck"/>

        <module name="com.puppycrawl.tools.checkstyle.checks.imports.RedundantImportCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.imports.UnusedImportsCheck">
            <property name="processJavadoc" value="true"/>
        </module>

        <!-- Javadoc Comments -->
        <module name="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocTypeCheck">
            <property name="scope" value="public"/>
            <property name="excludeScope" value="package"/>
            <property name="authorFormat" value=".+\s.+"/>
        </module>

        <module name="com.puppycrawl.tools.checkstyle.checks.javadoc.NonEmptyAtclauseDescriptionCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocTagContinuationIndentationCheck">
            <property name="offset" value="0"/>
        </module>
        <module name="com.puppycrawl.tools.checkstyle.checks.javadoc.AtclauseOrderCheck">
            <property name="target" value="CLASS_DEF, INTERFACE_DEF, ENUM_DEF"/>
            <property name="tagOrder"
                      value="@param, @author, @version, @see, @since, @serial, @deprecated"/>
        </module>
        <module name="com.puppycrawl.tools.checkstyle.checks.javadoc.AtclauseOrderCheck">
            <property name="target" value="METHOD_DEF, CTOR_DEF, VARIABLE_DEF"/>
            <property name="tagOrder"
                      value="@param, @return, @throws, @see, @since, @deprecated"/>
        </module>

        <!-- Miscellaneous -->
        <module name="com.puppycrawl.tools.checkstyle.checks.indentation.CommentsIndentationCheck">
            <property name="tokens" value="BLOCK_COMMENT_BEGIN"/>
        </module>
        <module name="com.puppycrawl.tools.checkstyle.checks.UpperEllCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.ArrayTypeStyleCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.OuterTypeFilenameCheck"/>

        <!-- Modifiers -->
        <module name="com.puppycrawl.tools.checkstyle.checks.modifier.RedundantModifierCheck"/>

        <module name="com.puppycrawl.tools.checkstyle.checks.regexp.RegexpSinglelineJavaCheck">
            <property name="maximum" value="0"/>
            <property name="format"
                      value="org\.junit\.(Assert|jupiter\.api\.Assertions)\.assert"/>
            <property name="message"
                      value="Please use AssertJ imports."/>
            <property name="ignoreComments" value="true"/>
        </module>
        <module name="com.puppycrawl.tools.checkstyle.checks.regexp.RegexpCheck">
            <property name="format" value="[ \t]+$"/>
            <property name="illegalPattern" value="true"/>
            <property name="message" value="Trailing whitespace"/>
        </module>

        <!-- Whitespace -->
        <module name="com.puppycrawl.tools.checkstyle.checks.whitespace.GenericWhitespaceCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.whitespace.MethodParamPadCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.whitespace.NoWhitespaceAfterCheck">
            <property name="tokens"
                      value="BNOT, DEC, DOT, INC, LNOT, UNARY_MINUS, UNARY_PLUS, ARRAY_DECLARATOR"/>
        </module>
        <module name="com.puppycrawl.tools.checkstyle.checks.whitespace.NoWhitespaceBeforeCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.whitespace.ParenPadCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.whitespace.TypecastParenPadCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.whitespace.WhitespaceAfterCheck"/>
        <module name="com.puppycrawl.tools.checkstyle.checks.whitespace.WhitespaceAroundCheck"/>
    </module>
</module>