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">
  <property name="severity" value="error" />
  <module name="TreeWalker">
    <module name="LineLength">
      <property name="max" value="120" />
      <property name="ignorePattern" value="^(package|import).*"/>
    </module>
    <module name="WhitespaceAfter">
      <property name="tokens" value="COMMA, SEMI" />
    </module>
    <module name="IllegalImport" />
    <module name="RedundantImport" />
    <module name="UnusedImports" />
    <module name="AvoidStarImport" />
    <module name="AvoidStaticImport" />
    <module name="EqualsAvoidNull" />
    <module name="ExplicitInitialization" />
    <module name="IllegalCatch">
      <property name="severity" value="warning"/>
    </module>
    <module name="MissingSwitchDefault" />
    <module name="SimplifyBooleanExpression" />
    <module name="StringLiteralEquality" />
    <module name="SimplifyBooleanReturn" />
    <module name="MultipleStringLiterals">
      <property name="allowedDuplicates" value="3"/>
      <property name="ignoreStringsRegexp" value='(\[)|(\])|(/)|((\\n)+)'/>
      <property name="severity" value="warning"/>
    </module>
    <module name="MagicNumber">
      <property name="ignoreNumbers" value="-1, 0, 1, 2, 7, 8, 24, 60, 365, 1000, 1024"/>
      <property name="severity" value="warning"/>
    </module>
  </module>
</module>