checkstyle.xml

<?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 sun coding conventions from:

 - the Java Language Specification at
 https://docs.oracle.com/javase/specs/jls/se11/html/index.html

 - the Sun Code Conventions at https://www.oracle.com/java/technologies/javase/codeconventions-contents.html

 - the Javadoc guidelines at
 https://www.oracle.com/technical-resources/articles/java/javadoc-tool.html

 - the JDK Api documentation https://docs.oracle.com/en/java/javase/11/

 - some best practices

 Checkstyle is very configurable. Be sure to read the documentation at
 https://checkstyle.org (or in your downloaded distribution).

 Most Checks are configurable, be sure to consult the documentation.

 To completely disable a check, just comment it out or delete it from the file.
 To suppress certain violations please review suppression filters.

 Finally, it is worth reading the documentation.

-->

<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/filefilters/index.html -->
 <module name="BeforeExecutionExclusionFileFilter">
 <property name="fileNamePattern" value="module\-info\.java$"/>
 </module>

 <!-- https://checkstyle.org/filters/suppressionfilter.html -->
 <module name="SuppressionFilter">
 <property name="file" value="${org.checkstyle.sun.suppressionfilter.config}"
 default="checkstyle-suppressions.xml" />
 <property name="optional" value="true"/>
 </module>

 <!-- Checks that property files contain the same keys. -->
 <!-- See https://checkstyle.org/checks/misc/translation.html -->
 <module name="Translation"/>

 <!-- Checks for Size Violations. -->
 <!-- See https://checkstyle.org/checks/sizes/index.html -->
 <module name="FileLength"/>
 <module name="LineLength">
 <property name="fileExtensions" value="java"/>
 <property name="max" value="200"/>
 </module>

 <!-- Checks for whitespace -->
 <!-- See https://checkstyle.org/checks/whitespace/index.html -->
 <module name="FileTabCharacter"/>

 <!-- Miscellaneous other checks. -->
 <!-- See https://checkstyle.org/checks/misc/index.html -->
<!-- <module name="RegexpSingleline">-->
<!-- <property name="format" value="\s+$"/>-->
<!-- <property name="minimum" value="0"/>-->
<!-- <property name="maximum" value="0"/>-->
<!-- <property name="message" value="Line has trailing spaces."/>-->
<!-- </module>-->

 <!-- Checks for Headers -->
 <!-- See https://checkstyle.org/checks/header/index.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/checks/javadoc/index.html -->
 <module name="InvalidJavadocPosition"/>
 <module name="JavadocMethod"/>
 <module name="JavadocType"/>
 <module name="JavadocVariable">
 <property name="scope" value="public"/>
 </module>
 <module name="JavadocStyle">
 <property name="scope" value="public"/>
 <property name="checkFirstSentence" value="false"/>
 </module>
 <module name="MissingJavadocMethod">
 <property name="scope" value="public"/>
 <property name="ignoreMethodNamesRegex" value="^foo.*$"/>
 <property name="allowMissingPropertyJavadoc" value="true"/>
 <property name="allowedAnnotations" value="Override,Deprecated"/>
 </module>
 <module name="MissingJavadocType">
 <property name="scope" value="public"/>
 </module>

 <!-- Checks for Naming Conventions. -->
 <!-- See https://checkstyle.org/checks/naming/index.html -->
 <module name="ConstantName"/>
 <module name="LocalFinalVariableName"/>
 <module name="LocalVariableName">
 <property name="format" value="^_?[a-z](_?[a-zA-Z0-9]+)*$"/>
 </module>
 <module name="MemberName">
 <property name="applyToPrivate" value="false"/>
 </module>
 <module name="MethodName"/>
 <module name="PackageName"/>
 <module name="ParameterName"/>
 <module name="StaticVariableName"/>
 <module name="TypeName"/>

 <!-- Checks for imports -->
 <!-- See https://checkstyle.org/checks/imports/index.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/checks/sizes/index.html -->
 <module name="MethodLength">
 <property name="max" value="330"/>
 </module>
 <module name="ParameterNumber">
 <property name="max" value="10"/>
 <property name="tokens" value="METHOD_DEF"/>
 </module>

 <!-- Checks for whitespace -->
 <!-- See https://checkstyle.org/checks/whitespace/index.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/checks/modifier/index.html -->
 <module name="RedundantModifier"/>

 <!-- Checks for blocks. You know, those {}'s -->
 <!-- See https://checkstyle.org/checks/blocks/index.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/checks/coding/index.html -->
 <module name="EmptyStatement"/>
 <module name="EqualsHashCode"/>
 <module name="IllegalInstantiation"/>
 <module name="InnerAssignment"/>
 <module name="MagicNumber">
 <property name="tokens" value="NUM_DOUBLE, NUM_FLOAT"/>
 <property name="ignoreNumbers" value="0, 0.5, 1, -1, -0.5, 2.0, 1.5"/>
 <property name="ignoreFieldDeclaration" value="true"/>
 <property name="ignoreAnnotation" value="true"/>
 <property name="ignoreHashCodeMethod" value="true"/>
 <property name="constantWaiverParentToken" value="ASSIGN, ARRAY_INIT, EXPR, UNARY_PLUS, UNARY_MINUS, TYPECAST, ELIST, DIV, PLUS"/>
 </module>
 <module name="MissingSwitchDefault"/>
 <module name="SimplifyBooleanExpression"/>
 <module name="SimplifyBooleanReturn"/>
 <module name="UnnecessaryParentheses">
 <property name="tokens"
 value="EXPR, IDENT, NUM_DOUBLE, NUM_FLOAT, NUM_INT, NUM_LONG, STRING_LITERAL,
 LITERAL_NULL, LITERAL_FALSE, LITERAL_TRUE, ASSIGN, BAND_ASSIGN, BOR_ASSIGN,
 BSR_ASSIGN, BXOR_ASSIGN, DIV_ASSIGN, MINUS_ASSIGN, MOD_ASSIGN, PLUS_ASSIGN,
 SL_ASSIGN, SR_ASSIGN, STAR_ASSIGN, LAMBDA, TEXT_BLOCK_LITERAL_BEGIN, LAND,
 LOR, LITERAL_INSTANCEOF, GT, LT, GE, LE, EQUAL, NOT_EQUAL, UNARY_MINUS,
 UNARY_PLUS, INC, DEC, LNOT, BNOT, POST_INC, POST_DEC, BOR, BXOR, BAND"/>
 </module>
 <module name="UnnecessarySemicolonAfterOuterTypeDeclaration"/>
 <module name="UnnecessarySemicolonAfterTypeMemberDeclaration"/>
 <module name="UnnecessarySemicolonInEnumeration"/>
 <module name="UnnecessarySemicolonInTryWithResources"/>
 <module name="UnusedLocalVariable"/>

 <!-- Checks for class design -->
 <!-- See https://checkstyle.org/checks/design/index.html -->
 <module name="FinalClass"/>
 <module name="HideUtilityClassConstructor"/>
 <module name="InterfaceIsType"/>

 <!-- Miscellaneous other checks. -->
 <!-- See https://checkstyle.org/checks/misc/index.html -->
 <module name="ArrayTypeStyle"/>
 <module name="TodoComment"/>
 <module name="UpperEll"/>

 <!-- https://checkstyle.org/filters/suppressionxpathfilter.html -->
 <module name="SuppressionXpathFilter">
 <property name="file" value="${org.checkstyle.sun.suppressionxpathfilter.config}"
 default="checkstyle-xpath-suppressions.xml" />
 <property name="optional" value="true"/>
 </module>



 </module>

</module>