checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
        "-//Puppy Crawl//DTD Check Configuration 1.2//EN"
        "http://www.puppycrawl.com/dtds/configuration_1_2.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}"/>
    -->

    <module name="TreeWalker">

        <property name="cacheFile" value="${checkstyle.cache.file}"/>

        <!-- required for SuppressWarningsFilter (and other Suppress* rules not used here) -->
        <!-- see http://checkstyle.sourceforge.net/config_annotation.html#SuppressWarningsHolder -->
        <module name="SuppressWarningsHolder"/>

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

    </module>

    <!-- Support @SuppressWarnings (added in Checkstyle 5.7) -->
    <!-- see http://checkstyle.sourceforge.net/config.html#SuppressWarningsFilter -->
    <module name="SuppressWarningsFilter"/>

    <!-- Checks properties file for a duplicated properties. -->
    <!-- See http://checkstyle.sourceforge.net/config_misc.html#UniqueProperties -->
    <module name="UniqueProperties"/>

</module>