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="CustomImportOrder">
      <property name="sortImportsInGroupAlphabetically" value="true"/>
      <property name="separateLineBetweenGroups" value="true"/>
      <property name="customImportOrderRules" value="STATIC###THIRD_PARTY_PACKAGE"/>
      <property name="tokens" value="IMPORT, STATIC_IMPORT, PACKAGE_DEF"/>
    </module>
    <module name="NeedBraces">
      <property name="tokens" value="LITERAL_DO, LITERAL_ELSE, LITERAL_FOR, LITERAL_IF, LITERAL_WHILE"/>
    </module>
    <module name="UnusedImports" />
    <module name="AvoidStarImport" />
  </module>
</module>