checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
  "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
  "http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
<module name="Checker">
  <module name="TreeWalker">
    <!-- enable supressing warnings with comments or annotations -->
    <module name="SuppressWarningsHolder" />
    <module name="FileContentsHolder" />

    <!-- Annotations -->
    <module name="AnnotationUseStyle" />
    <module name="MissingDeprecated" />

    <!-- Block checks -->
    <module name="AvoidNestedBlocks" />
    <module name="EmptyBlock" />
    <module name="LeftCurly" />
    <module name="NeedBraces" />
    <module name="RightCurly" />

    <!-- Class design -->
    <module name="FinalClass" />
    <module name="HideUtilityClassConstructor" />
    <module name="InterfaceIsType" />
    <module name="MutableException" />

    <!-- Coding -->
    <module name="CovariantEquals" />
    <module name="DefaultComesLast" />
    <module name="EmptyStatement" />
    <module name="EqualsAvoidNull" />
    <module name="EqualsHashCode" />
    <module name="ExplicitInitialization" />
    <module name="FallThrough" />
    <module name="FinalLocalVariable" />
    <module name="IllegalInstantiation" />
    <module name="IllegalToken" />
    <module name="IllegalTokenText" />
    <module name="IllegalType" />
    <module name="ModifiedControlVariable" />
    <module name="MultipleVariableDeclarations" />
    <module name="NoClone" />
    <module name="NoFinalizer" />
    <module name="OneStatementPerLine" />
    <module name="ParameterAssignment" />
    <module name="SimplifyBooleanExpression" />
    <module name="SimplifyBooleanReturn" />
    <module name="StringLiteralEquality" />
    <module name="UnnecessaryParentheses" />
    <module name="VariableDeclarationUsageDistance" />

    <!-- Imports -->
    <module name="AvoidStarImport" />
    <module name="AvoidStaticImport">
      <!-- Allow static imports for utils-style classes in the JDK or commonly
           used libraries. -->
      <property name="excludes" value="java.util.Collections.*" />
      <property name="excludes" value="java.util.stream.Collectors.*" />
      <property name="excludes" value="java.util.Comparator.*" />
      <property name="excludes" value="org.junit.Assert.*" />
      <property name="excludes" value="org.mockito.Matchers.*" />
      <property name="excludes" value="org.mockito.Mockito.*" />
    </module>

    <module name="IllegalImport" />
    <module name="RedundantImport" />
    <module name="UnusedImports" />

    <!-- Miscellaneous -->
    <module name="ArrayTypeStyle" />
    <module name="CommentsIndentation" />
    <module name="FinalParameters" />
    <module name="Indentation">
      <property name="basicOffset" value="2" />
      <property name="arrayInitIndent" value="2" />
      <property name="caseIndent" value="2" />
      <property name="throwsIndent" value="2" />
      <property name="lineWrappingIndentation" value="2" />
    </module>

    <!-- Modifiers -->
    <module name="RedundantModifier" />

    <!-- Whitespace -->
    <module name="EmptyForInitializerPad" />
    <module name="GenericWhitespace" />
    <module name="MethodParamPad" />
    <module name="NoLineWrap" />
    <module name="NoWhitespaceAfter" />
    <module name="NoWhitespaceBefore" />
    <module name="ParenPad" />
    <module name="SeparatorWrap">
      <property name="option" value="nl" />
      <property name="tokens" value="DOT" />
    </module>
    <module name="TypecastParenPad" />
    <module name="WhitespaceAfter" />
  </module>

  <!-- Supressing warnings -->
  <module name="SuppressWarningsFilter"/>
  <module name="SuppressionCommentFilter">
    <property name="offCommentFormat" value="CHECKSTYLE:([^:]+):OFF"/>
    <property name="onCommentFormat"  value="CHECKSTYLE:([^:]+):ON"/>
    <property name="checkFormat" value="$1"/>
  </module>

  <!-- Editor style -->
  <module name="FileLength">
    <property name="max" value="800" />
  </module>
  <module name="FileTabCharacter" />
  <module name="NewlineAtEndOfFile" />
</module>