checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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="FileTabCharacter" />
  <module name="NewlineAtEndOfFile">
    <property name="lineSeparator" value="lf" />
  </module>
  <module name="RegexpSingleline">
    <property name="format" value="[ \t]+$" />
    <property name="message" value="Trailing whitespace" />
  </module>
  <module name="TreeWalker">
    <module name="Indentation">
      <property name="caseIndent" value="0" />
    </module>
    <module name="OperatorWrap">
      <property name="option" value="eol" />
    </module>
    <module name="ParenPad">
      <property name="option" value="space" />
    </module>
    <module name="TrailingComment" />
    <module name="UnusedImports" />
  </module>
</module>