checkstyle.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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="FileTabCharacter"/>
  <module name="NewlineAtEndOfFile">
    <property name="lineSeparator" value="lf"/>
  </module>
  <module name="RegexpSingleline">
    <property name="format" value="\s+$"/>
    <property name="message" value="Trailing spaces are not allowed."/>
  </module>
  <module name="TreeWalker">
    <module name="ImportOrder">
      <property name="separatedStaticGroups" value="true"/>
      <property name="option" value="bottom"/>
    </module>
    <module name="UnusedImports"/>
    <module name="AvoidStarImport"/>
  </module>
</module>