checkstyle 8.1 example

checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
  "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
  "http://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
<!--

  Checkstyle configuration that checks the sun coding conventions from:

    - the Java Language Specification at
      http://java.sun.com/docs/books/jls/second_edition/html/index.html

    - the Sun Code Conventions at http://java.sun.com/docs/codeconv/

    - the Javadoc guidelines at
      http://java.sun.com/j2se/javadoc/writingdoccomments/index.html

    - the JDK Api documentation http://java.sun.com/j2se/docs/api/index.html

    - some best practices

  Checkstyle is very configurable. Be sure to read the documentation at
  http://checkstyle.sf.net (or in your downloaded distribution).

  Most Checks are configurable, be sure to consult the documentation.

  To completely disable a check, just comment it out or delete it from the file.

  Finally, it is worth reading the documentation.

-->

<module name="Checker">
  <!--
      If you set the basedir property below, then all reported file
      names will be relative to the specified directory. See
      http://checkstyle.sourceforge.net/5.x/config.html#Checker

      <property name="basedir" value="${basedir}"/>
  -->

  <property name="fileExtensions" value="java, properties, xml"/>
  <property name="severity" value="error"/>

  <module name="BeforeExecutionExclusionFileFilter">
    <property name="fileNamePattern" value="(.*/build/generated-test-sources/.*)|(.*/src/test/.*)"/>
  </module>

  <!-- Checks that a package-info.java file exists for each package.     -->
  <!-- See http://checkstyle.sf.net/config_javadoc.html#JavadocPackage -->
  <!--<module name="JavadocPackage"/>-->

  <!-- Checks whether files end with a new line.                        -->
  <!-- See http://checkstyle.sf.net/config_misc.html#NewlineAtEndOfFile -->
  <module name="NewlineAtEndOfFile"/>

  <!-- Checks that property files contain the same keys.         -->
  <!-- See http://checkstyle.sf.net/config_misc.html#Translation -->
  <!--<module name="Translation"/>-->

  <!-- Checks for Size Violations.                    -->
  <!-- See http://checkstyle.sf.net/config_sizes.html -->
  <module name="FileLength">
    <property name="max" value="500"/>
  </module>

  <!-- Checks for whitespace                               -->
  <!-- See http://checkstyle.sf.net/config_whitespace.html -->
  <module name="FileTabCharacter"/>

  <!-- Miscellaneous other checks.                   -->
  <!-- See http://checkstyle.sf.net/config_misc.html -->
  <module name="RegexpSingleline">
    <property name="format" value="\s+$"/>
    <property name="minimum" value="0"/>
    <property name="maximum" value="0"/>
    <property name="message" value="Line has trailing spaces."/>
  </module>

  <!-- Checks for Headers                                -->
  <!-- See http://checkstyle.sf.net/config_header.html   -->
  <!-- <module name="Header"> -->
  <!--   <property name="headerFile" value="${checkstyle.header.file}"/> -->
  <!--   <property name="fileExtensions" value="java"/> -->
  <!-- </module> -->

  <module name="SuppressWarningsFilter"/>

  <module name="TreeWalker">

    <module name="SuppressWarningsHolder"/>

    <!-- Checks for Javadoc comments.                     -->
    <!-- See http://checkstyle.sf.net/config_javadoc.html -->
    <!--<module name="JavadocMethod"/>-->
    <!--<module name="JavadocType"/>-->
    <!--<module name="JavadocVariable"/>-->
    <!--<module name="JavadocStyle"/>-->

    <!-- Checks for Naming Conventions.                  -->
    <!-- See http://checkstyle.sf.net/config_naming.html -->
    <module name="ConstantName"/>
    <module name="LocalFinalVariableName"/>
    <module name="LocalVariableName"/>
    <module name="MemberName"/>
    <module name="MethodName">
      <property name="format" value="^[a-z_][a-zA-Z0-9_]*$"/>
    </module>
    <module name="PackageName"/>
    <module name="ParameterName"/>
    <module name="StaticVariableName"/>
    <module name="TypeName"/>

    <!-- Checks for imports                              -->
    <!-- See http://checkstyle.sf.net/config_import.html -->
    <!--<module name="AvoidStarImport"/>-->
    <module name="IllegalImport"/> <!-- defaults to sun.* packages -->
    <module name="RedundantImport"/>
    <module name="UnusedImports">
      <property name="processJavadoc" value="false"/>
    </module>

    <!-- Checks for Size Violations.                    -->
    <!-- See http://checkstyle.sf.net/config_sizes.html -->
    <module name="LineLength">
      <property name="max" value="120"/>
    </module>
    <module name="MethodLength">
      <property name="tokens" value="METHOD_DEF"/>
      <property name="max" value="60"/>
    </module>
    <module name="ParameterNumber"/>

    <!-- Checks for whitespace                               -->
    <!-- See http://checkstyle.sf.net/config_whitespace.html -->
    <module name="EmptyForIteratorPad"/>
    <module name="GenericWhitespace"/>
    <module name="MethodParamPad"/>
    <module name="NoWhitespaceAfter"/>
    <module name="NoWhitespaceBefore"/>
    <module name="OperatorWrap"/>
    <module name="ParenPad"/>
    <module name="TypecastParenPad"/>
    <module name="WhitespaceAfter"/>
    <module name="WhitespaceAround"/>

    <!-- Modifier Checks                                    -->
    <!-- See http://checkstyle.sf.net/config_modifiers.html -->
    <module name="ModifierOrder"/>
    <module name="RedundantModifier"/>

    <!-- Checks for blocks. You know, those {}'s         -->
    <!-- See http://checkstyle.sf.net/config_blocks.html -->
    <module name="AvoidNestedBlocks"/>
    <module name="EmptyBlock"/>
    <module name="LeftCurly"/>
    <module name="NeedBraces"/>
    <module name="RightCurly"/>

    <!-- Checks for common coding problems               -->
    <!-- See http://checkstyle.sf.net/config_coding.html -->
    <!--<module name="AvoidInlineConditionals"/>-->
    <module name="EmptyStatement"/>
    <module name="EqualsHashCode"/>
    <module name="HiddenField">
      <property name="ignoreSetter" value="true"/>
      <property name="ignoreConstructorParameter" value="true"/>
    </module>
    <module name="IllegalInstantiation"/>
    <module name="InnerAssignment"/>
    <module name="MagicNumber"/>
    <module name="MissingSwitchDefault"/>
    <module name="SimplifyBooleanExpression"/>
    <module name="SimplifyBooleanReturn"/>

    <!-- Checks for class design                         -->
    <!-- See http://checkstyle.sf.net/config_design.html -->
    <!--<module name="DesignForExtension"/>-->
    <module name="FinalClass"/>
    <!--<module name="HideUtilityClassConstructor"/>-->
    <module name="InterfaceIsType"/>
    <module name="VisibilityModifier">
      <property name="protectedAllowed" value="true"/>
    </module>

    <!-- Miscellaneous other checks.                   -->
    <!-- See http://checkstyle.sf.net/config_misc.html -->
    <module name="ArrayTypeStyle"/>
    <!--<module name="FinalParameters"/>-->
    <module name="TodoComment"/>
    <module name="UpperEll"/>

  </module>

</module>