checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
  "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
  "https://checkstyle.org/dtds/configuration_1_3.dtd">
<module name="Checker">
  <property name="severity" value="error"/>
  <property name="fileExtensions" value="java, xml"/>
  <module name="BeforeExecutionExclusionFileFilter">
    <property name="fileNamePattern" value="module\-info\.java$"/>
  </module>
  <module name="SuppressionFilter">
    <property name="file" value="${org.checkstyle.sun.suppressionfilter.config}"
              default="checkstyle-suppressions.xml"/>
    <property name="optional" value="true"/>
  </module>
  <module name="JavadocPackage"/>
  <module name="NewlineAtEndOfFile"/>
  <module name="Translation"/>
  <module name="FileTabCharacter"/>
  <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>
  <module name="TreeWalker">
    <module name="RequireThis"/>
    <module name="RequireEmptyLineBeforeBlockTagGroup"/>
    <module name="InvalidJavadocPosition"/>
    <module name="JavadocMethod"/>
    <module name="JavadocType">
      <property name="allowUnknownTags" value="true"/>
    </module>
    <module name="JavadocVariable"/>
    <module name="JavadocStyle"/>
    <module name="MissingJavadocMethod"/>
    <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"/>
    <module name="AvoidStarImport"/>
    <module name="IllegalImport"/>
    <module name="RedundantImport"/>
    <module name="UnusedImports">
      <property name="processJavadoc" value="true"/>
    </module>
    <module name="EmptyForIteratorPad"/>
    <module name="GenericWhitespace"/>
    <module name="MethodParamPad"/>
    <module name="NoWhitespaceAfter"/>
    <module name="NoWhitespaceBefore"/>
    <module name="ParenPad"/>
    <module name="TypecastParenPad"/>
    <module name="WhitespaceAfter"/>
    <module name="WhitespaceAround"/>
    <module name="ModifierOrder"/>
    <module name="RedundantModifier">
      <property name="tokens" value="METHOD_DEF"/>
      <property name="tokens" value="VARIABLE_DEF"/>
      <property name="tokens" value="ANNOTATION_FIELD_DEF"/>
      <property name="tokens" value="INTERFACE_DEF"/>
      <property name="tokens" value="CTOR_DEF"/>
      <property name="tokens" value="CLASS_DEF"/>
      <property name="tokens" value="ENUM_DEF"/>
    </module>
    <module name="AvoidNestedBlocks"/>
    <module name="LeftCurly"/>
    <module name="NeedBraces"/>
    <module name="RightCurly"/>
    <module name="EmptyStatement"/>
    <module name="EqualsHashCode"/>
    <module name="IllegalInstantiation"/>
    <module name="MissingSwitchDefault"/>
    <module name="MultipleVariableDeclarations"/>
    <module name="SimplifyBooleanExpression"/>
    <module name="SimplifyBooleanReturn"/>
    <module name="FinalClass"/>
    <module name="HideUtilityClassConstructor"/>
    <module name="InterfaceIsType"/>
    <module name="ArrayTypeStyle"/>
    <module name="FinalParameters"/>
    <module name="TodoComment"/>
    <module name="UpperEll"/>
    <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>