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">
  <module name="SuppressWarningsFilter" />
  <module name="LineLength">
    <property name="max" value="160" />
  </module>
  <module name="TreeWalker">
    <module name="SuppressWarningsHolder" />
    <module name="Indentation">
      <property name="basicOffset" value="4" />
      <property name="caseIndent" value="0" />
    </module>
    <module name="MethodParamPad" />
    <module name="NoWhitespaceAfter" />
    <module name="NoWhitespaceBefore" />
    <module name="ParenPad" />
    <module name="TypecastParenPad">
      <property name="option" value="nospace" />
    </module>
    <module name="WhitespaceAfter">
      <property name="tokens" value="COMMA, SEMI" /> <!-- not typecasts -->
    </module>
    <module name="WhitespaceAround">
      <property name="allowEmptyConstructors" value="true" />
      <property name="allowEmptyMethods" value="true" />
      <property name="allowEmptyTypes" value="true" />
      <property name="allowEmptyLoops" value="true" />
    </module>
    <module name="ModifierOrder" />
    <module name="RedundantModifier" />
    <module name="EmptyBlock">
      <property name="option" value="text" />
    </module>
    <module name="LeftCurly">
    </module>
    <module name="RightCurly" />
    <module name="AvoidNestedBlocks">
      <property name="allowInSwitchCase" value="true" />
    </module>
    <module name="EmptyStatement" />
    <module name="UpperEll" />
    <module name="ArrayTypeStyle" />
    <module name="PackageName">
      <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$" />
    </module>
    <module name="TypeName" />
    <module name="ConstantName">
      <property name="format" value="^([A-Z][A-Z0-9]*(_[A-Z0-9]+)*|log)$" />
    </module>
    <module name="MemberName" />
    <module name="LocalFinalVariableName" />
    <module name="LocalVariableName" />
    <module name="ParameterName" />
    <module name="StaticVariableName" />
    <module name="UnnecessaryParentheses" />
    <module name="PackageDeclaration" />
    <module name="AvoidStarImport" />
    <module name="IllegalImport" />
    <module name="RedundantImport" />
    <module name="UnusedImports" />
    <module name="CovariantEquals" />
    <module name="EqualsHashCode" />
    <module name="InnerAssignment" />
    <module name="MissingSwitchDefault" />
    <module name="ModifiedControlVariable" />
    <module name="SimplifyBooleanExpression" />
    <module name="SimplifyBooleanReturn" />
    <module name="StringLiteralEquality" />
    <module name="SuperClone" />
    <module name="SuperFinalize" />
    <module name="IllegalThrows" />
    <module name="ExplicitInitialization" />
    <module name="DefaultComesLast" />
    <module name="FallThrough" />
    <module name="MultipleVariableDeclarations" />
    <module name="FinalClass" />
    <module name="HideUtilityClassConstructor" />
    <module name="MutableException" />
    <module name="UncommentedMain">
      <property name="excludedClasses" value="org\.wikidata\.query\.rdf\.tool\..*" />
    </module>
  </module>
  <module name="NewlineAtEndOfFile" />
  <module name="RegexpSingleline">
    <property name="format" value="\s+$" />
    <property name="message" value="Line has trailing spaces." />
  </module>
</module>