checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
  "http://www.puppycrawl.com/dtds/configuration_1_3.dtd">
<module name="Checker">
  <module name="SuppressWarningsFilter" />
  <property name="fileExtensions" value="java, properties, xml"/>

  <module name="NewlineAtEndOfFile"/>
  <module name="FileTabCharacter">
    <property name="eachLine" value="true"/>
  </module>

  <module name="LineLength">
    <property name="max" value="100"/>
    <property name="ignorePattern"
      value="^package.*|^import.*|a href|href|http://|https://|ftp://|&lt;pre&gt;"/>
  </module>

  <module name="TreeWalker">
    <module name="SuppressWarningsHolder" />
    <module name="SuppressionCommentFilter"/>

    <module name="AnnotationLocation"/>

    <module name="EmptyBlock">
      <property name="tokens"
        value="LITERAL_TRY, LITERAL_FINALLY, LITERAL_IF, LITERAL_ELSE, LITERAL_SWITCH"/>
    </module>
    <module name="EmptyCatchBlock"/>
    <module name="LeftCurly"/>
    <module name="NeedBraces"/>
    <module name="RightCurly"/>
    <module name="RightCurly">
      <property name="option" value="alone"/>
      <property name="tokens"
        value="CLASS_DEF, METHOD_DEF, CTOR_DEF, LITERAL_FOR, LITERAL_WHILE, STATIC_INIT, INSTANCE_INIT"/>
    </module>

    <module name="OneTopLevelClass"/>

    <module name="DeclarationOrder"/>
    <module name="DefaultComesLast"/>
    <module name="EmptyStatement"/>
    <module name="EqualsAvoidNull"/>
    <module name="EqualsHashCode"/>
    <module name="FallThrough"/>
    <module name="IllegalToken"/>
    <module name="InnerAssignment"/>
    <module name="MissingSwitchDefault"/>
    <module name="ModifiedControlVariable"/>
    <module name="MultipleVariableDeclarations"/>
    <module name="NoFinalizer"/>
    <module name="OneStatementPerLine"/>
    <module name="OverloadMethodsDeclarationOrder"/>
    <module name="StringLiteralEquality"/>

    <module name="AvoidStarImport"/>
    <module name="IllegalImport"/>
    <module name="ImportOrder">
      <property name="option" value="top"/>
      <property name="separated" value="true"/>
    </module>
    <module name="RedundantImport"/>
    <module name="UnusedImports"/>

    <module name="AtclauseOrder"/>
    <module name="JavadocStyle"/>
    <module name="NonEmptyAtclauseDescription"/>
    <module name="SingleLineJavadoc"/>

    <module name="ArrayTypeStyle"/>
    <module name="AvoidEscapedUnicodeCharacters">
      <property name="allowEscapesForControlCharacters" value="true"/>
      <property name="allowByTailComment" value="true"/>
      <property name="allowNonPrintableEscapes" value="true"/>
    </module>
    <module name="CommentsIndentation"/>
    <module name="Indentation">
      <property name="basicOffset" value="2"/>
      <property name="braceAdjustment" value="0"/>
      <property name="caseIndent" value="2"/>
      <property name="throwsIndent" value="4"/>
      <property name="lineWrappingIndentation" value="4"/>
      <property name="arrayInitIndent" value="2"/>
    </module>
    <module name="OuterTypeFilename"/>
    <module name="UpperEll"/>

    <module name="ModifierOrder"/>
    <module name="RedundantModifier"/>

    <module name="AbbreviationAsWordInName"/>
    <module name="CatchParameterName"/>
    <module name="ClassTypeParameterName"/>
    <module name="ConstantName"/>
    <module name="InterfaceTypeParameterName"/>
    <module name="LocalFinalVariableName"/>
    <module name="LocalVariableName">
      <property name="allowOneCharVarInForLoop" value="true"/>
    </module>
    <module name="MemberName"/>
    <module name="MethodName"/>
    <module name="MethodTypeParameterName"/>
    <module name="PackageName">
      <property name="format" value="^[a-z]+(\.[a-z][a-z0-9]*)*$"/>
    </module>
    <module name="ParameterName"/>
    <module name="StaticVariableName"/>
    <module name="TypeName"/>

    <module name="EmptyForInitializerPad"/>
    <module name="EmptyForIteratorPad"/>
    <module name="EmptyLineSeparator">
      <property name="allowNoEmptyLineBetweenFields" value="true"/>
      <property name="allowMultipleEmptyLines" value="false"/>
      <property name="allowMultipleEmptyLinesInsideClassMembers" value="false"/>
    </module>
    <module name="GenericWhitespace"/>
    <module name="MethodParamPad"/>
    <module name="NoLineWrap"/>
    <module name="NoWhitespaceAfter"/>
    <module name="NoWhitespaceBefore"/>
    <module name="OperatorWrap">
      <property name="option" value="nl"/>
      <property name="tokens" value="QUESTION, COLON, EQUAL, NOT_EQUAL, DIV, MINUS, STAR, MOD, SR, BSR, GE, GT, SL, LE, LT, BXOR, BOR, LOR, BAND, TYPE_EXTENSION_AND, LITERAL_INSTANCEOF"/>
    </module>
    <module name="ParenPad"/>
    <module name="SeparatorWrap">
      <property name="tokens" value="DOT"/>
      <property name="option" value="nl"/>
    </module>
    <module name="SeparatorWrap">
      <property name="tokens" value="COMMA"/>
      <property name="option" value="EOL"/>
    </module>
    <module name="TypecastParenPad"/>
    <module name="WhitespaceAfter"/>
    <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>
</module>