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">

  <!-- Please refer to this document to check details about particular check: -->
  <!-- http://checkstyle.sourceforge.net/availablechecks.html -->

  <property name="charset" value="UTF-8"/>
  <property name="fileExtensions" value="java, xml, properties"/>

  <!--Check for presence of tab character-->
  <module name="FileTabCharacter">
    <property name="eachLine" value="true"/>
  </module>

  <!-- There must be no trailing whitespace at the end of any line -->
  <module name="RegexpSingleline">
    <!-- \s matches whitespace character, $ matches end of line. -->
    <property name="format" value="\s+$"/>
    <property name="message" value="Line has trailing spaces."/>
  </module>

  <module name="SuppressionFilter">
    <property name="file" value="/checkstyle/checkstyle-ignore.xml"/>
    <property name="optional" value="true"/>
  </module>

  <module name="TreeWalker">
    <property name="fileExtensions" value="java"/>

    <!-- Checks for star imports -->
    <module name="AvoidStarImport">
      <property name="allowStaticMemberImports" value="true"/>
    </module>

    <!-- Redundant imports...-->
    <module name="RedundantImport"/>

    <module name="UnusedImports"/>

    <module name="IllegalImport"/>

    <module name="GenericWhitespace"/>

    <module name="MethodParamPad">
      <property name="allowLineBreaks" value="true"/>
    </module>

    <module name="ParenPad"/>

    <module name="NoWhitespaceAfter"/>
    <module name="NoWhitespaceBefore"/>

    <module name="WhitespaceAround"/>

    <!-- Modifier Checks-->
    <!-- RIGHT: public static WRONG: static public -->
    <module name="ModifierOrder"/>

    <!-- Checks for redundant modifiers in interface and annotation definitions. -->
    <!-- Ignore INTERFACE_DEF as this errors on static methods of interfaces. When Java8 supported this might improve -->
    <module name="RedundantModifier">
      <property name="tokens" value="METHOD_DEF, VARIABLE_DEF, ANNOTATION_FIELD_DEF"/>
    </module>

    <!-- Require braces for blocks but allow single line statement without it. -->
    <module name="NeedBraces">
      <property name="allowSingleLineStatement" value="true"/>
    </module>

    <!-- Checks for blocks and if curly is place correctly. You know, those {}'s -->
    <module name="LeftCurly"/>
    <module name="RightCurly"/>


    <!-- Checks for common coding problems               -->

    <!-- Detects empty statements (standalone ;). -->
    <module name="EmptyStatement"/>

    <!-- Checks that classes that override equals() also override hashCode(). -->
    <module name="EqualsHashCode"/>

    <module name="DefaultComesLast"/>

    <!-- Checks for illegal instantiations where a extension method is preferred -->
    <module name="IllegalInstantiation"/>

    <module name="MissingSwitchDefault"/>

    <module name="HideUtilityClassConstructor"/>

    <module name="MissingOverride"/>


    <!-- Miscellaneous other checks. -->

    <!-- Checks that long constants are defined with an upper ell. That is ' L' and not 'l'. -->
    <module name="UpperEll"/>

    <!-- This check makes sure that all package annotations are in the package-info.java file -->
    <module name="PackageAnnotation"/>

    <!-- Checks that classes that define a covariant equals() method
         also override method equals(java.lang.Object). -->
    <module name="CovariantEquals"/>

    <!-- RIGHT: int[] buff WRONG: inf buff[] -->
    <module name="ArrayTypeStyle"/>

    <module name="StringLiteralEquality"/>

    <module name="InnerTypeLast"/>

    <module name="ArrayTypeStyle"/>
  </module>

</module>