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">

<module name="Checker">
    <module name="PackageHtml"/>

    <module name="TreeWalker">

        <property name="tabWidth" value="4" />

    <!-- JavaDoc checks -->
        <module name="JavadocType">
            <property name="scope" value="private" />
            <property name="authorFormat" value="\S"/>
        </module>
        <module name="JavadocMethod">
        <property name="scope" value="private" />
            <property name="allowUndeclaredRTE" value="true"/>
            <property name="allowMissingThrowsTags" value="true"/>
        </module>
        <module name="JavadocVariable">
            <property name="scope" value="private" />
    </module>

    <!-- Naming checks -->
        <module name="MemberName">
            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
        </module>
        <module name="ConstantName">
            <property name="format" value="^[A-Z](_?[A-Z0-9]+)*$"/>
        </module>
        <module name="StaticVariableName">
            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
        </module>
        <module name="ParameterName">
            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
        </module>
        <module name="PackageName">
            <property name="format" value="^[a-z]+(\.[a-z]*)*$"/>
        </module>
        <module name="TypeName">
            <property name="format" value="^[A-Z][a-zA-Z0-9]*$"/>
        </module>
        <module name="MethodName">
            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
        </module>
        <module name="LocalVariableName">
            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
        </module>
        <module name="LocalFinalVariableName">
            <property name="format" value="^[a-z][a-zA-Z0-9]*$"/>
        </module>

        <!-- Header checks -->
        <module name="RegexpHeader">
          <property name="headerFile" value="license.regexp"/>
        </module>

        <!-- Imports checks -->
        <module name="IllegalImport">
            <property name="illegalPkgs" value="sun"/>
        </module>
        <module name="UnusedImports"/>

        <!-- Size Violations checks -->
        <module name="LineLength">
            <property name="max" value="100"/>
            <property name="ignorePattern" value="Header:"/>
        </module>
        <!-- TODO: maxlinelen should be somthing more like
            "^ \* \$Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/checkstyle.xml.properties,v 1.1 2003/10/03 18:44:13 oglueck Exp $$"
        -->
        <module name="MethodLength">
            <property name="max" value="150"/>
        </module>
        <module name="FileLength">
            <property name="max" value="2000"/>
        </module>
        <module name="ParameterNumber">
            <property name="max" value="7"/>
        </module>

        <!-- Whitespace checks -->
        <module name="TabCharacter"/>
        <module name="ParenPad">
           <property name="option" value="nospace"/>
        </module>
        <module name="OperatorWrap">
           <property name="option" value="nl"/>
        </module>

        <!-- Violators checks -->
        <module name="RedundantModifier"/>

        <!-- Blocks checks -->
        <module name="EmptyBlock">
          <property name="option" value="text"/>
          <property name="tokens" value="LITERAL_CATCH"/>
        </module>
        <module name="LeftCurly">
            <property name="option" value="eol"/>
        </module>
        <module name="RightCurly">
            <property name="option" value="same"/>
        </module>

        <!-- Miscellaneous checks -->
        <module name="TodoComment">
          <property name="format" value="(TODO)|(FIXME):?"/>
        </module>
        <module name="UpperEll"/>
        <module name="IllegalInstantiation">
          <property name="classes" value="java.lang.Boolean"/>
        </module>

     </module>
</module>