checkstyle.xml

<?xml version="1.0"?>

<!DOCTYPE module PUBLIC
    "-//Puppy Crawl//DTD Check Configuration 1.1//EN"
    "http://www.puppycrawl.com/dtds/configuration_1_1.dtd">

<!-- customization of default Checkstyle behavior -->
<module name="Checker">
  <property name="localeLanguage" value="en"/>
  <!--module name="PackageHtml"/-->
  <module name="TreeWalker">
    <module name="MemberName">
      <property name="format" value="^i[A-Z][a-zA-Z0-9]*$"/>
    </module>
    <module name="LocalVariableName">
      <property name="format" value="^ex[0-9]*$"/>
      <property name="tokens" value="PARAMETER_DEF"/>
    </module>
    <module name="AvoidStarImport"/>
    <module name="RedundantImport"/>
    <module name="UnusedImports"/>
    
    <module name="TabCharacter"/>
    <module name="NeedBraces"/>
    <!--module name="TypecastParenPad"/-->
    <module name="WhitespaceAfter"/>
    <module name="WhitespaceAround"/>
    <module name="ModifierOrder"/>
    <module name="RedundantModifier"/>
    
    <module name="EmptyBlock"/>
    <module name="LeftCurly"/>
    <module name="NeedBraces"/>
    <module name="RightCurly"/>
    <!--module name="AvoidNestedBlocks">
      <property name="allowInSwitchCase" value="true"/>
    </module-->
    
    <!--module name="ArrayTrailingComma"/-->
    <!--module name="CovariantEquals"/-->
    <module name="DoubleCheckedLocking"/>
    <module name="EmptyStatement"/>
    <module name="EqualsHashCode"/>
    <!--module name="HiddenField">
      <property name="ignoreConstructorParameter" value="true"/>
      <property name="ignoreSetter" value="true"/>
    </module-->
    <module name="IllegalInstantiation">
      <property name="classes" value="java.lang.Boolean"/>
    </module>
    <!--module name="SuperClone"/-->
    <!--module name="ExplicitInitialization"/-->
              
    <module name="GenericIllegalRegexp">
      <property name="format" value="System\.out\.println"/>
    </module>
    <module name="GenericIllegalRegexp">
      <property name="format" value="System\.err\.println"/>
    </module>
    <module name="TodoComment"/>
    <module name="UpperEll"/>
    <module name="ArrayTypeStyle"/>
    <module name="Indentation"/>
          
    <module name="RedundantThrows">
      <property name="allowUnchecked" value="true"/>
    </module>
    <module name="LineLength">
      <property name="max" value="120"/>
    </module>
    <module name="JavadocVariable">
      <property name="excludeScope" value="private"/>
    </module>
    <module name="JavadocMethod">
      <property name="excludeScope" value="private"/>
      <property name="allowUndeclaredRTE" value="true"/>
    </module>
 </module>
</module>