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="RegexpSingleline">
      <!-- \s matches whitespace character, $ matches end of line. -->
      <property name="format" value="\s+$"/>
  </module>
  <module name="FileTabCharacter"/>

  <module name="TreeWalker">
    <module name="NeedBraces"/>
    <module name="LeftCurly">
      <property name="option" value="eol"/>
      <property name="maxLineLength" value="120"/>
    </module>

    <module name="RightCurly">
      <property name="option" value="same"/>
    </module>
    <module name="OneStatementPerLine"/>
    <module name="MultipleVariableDeclarations"/>
    <module name="ArrayTypeStyle"/>
    <module name="MissingSwitchDefault"/>
    <module name="Indentation"/>

    <module name="WhitespaceAround"/>
    <module name="WhitespaceAfter"/>
    <module name="TypecastParenPad"/>
    <module name="ParenPad"/>
    <module name="NoWhitespaceBefore"/>
    <module name="NoWhitespaceAfter"/>
    <module name="GenericWhitespace"/>
    <module name="EmptyLineSeparator"/>
  </module>
</module>