etc/coding_standards.xml

<?xml version="1.0" encoding="UTF-8"?>
<!--
 
 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership.  The ASF licenses this file
 to you under the Apache License, Version 2.0 (the
 "License"); you may not use this file except in compliance
 with the License.  You may obtain a copy of the License at
 
   http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing,
 software distributed under the License is distributed on an
 "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 KIND, either express or implied.  See the License for the
 specific language governing permissions and limitations
 under the License.
 
-->

<!DOCTYPE module PUBLIC "-//Puppy Crawl//DTD Check Configuration 1.1//EN" "http://www.puppycrawl.com/dtds/configuration_1_1.dtd">
<module name="Checker">
    <!-- Checks package.html defined for all packages. -->
    <module name="PackageHtml"/>

    <module name="TreeWalker">

        <!-- Whitespace conventions. -->
        <module name="TabCharacter"/>

        <!-- License conventions. Checks that the license is included in every file. -->
        <module name="Header">
            <property name="headerFile" value="${checkstyle.header.file}"/>
        </module>

        <!-- Coding style conventions. -->
        <module name="com.puppycrawl.tools.checkstyle.checks.coding.PackageDeclarationCheck">
            <property name="severity" value="error"/>
        </module>
        
        <!-- These rules ensure that everything is javadoc'ed. -->
        <!--
        <module name="RequiredRegexp">
            <property name="format" value="&lt;table id=&quot;crc&quot;&gt;&lt;caption&gt;CRC Card&lt;/caption&gt;"/>
        </module>
        -->

        <module name="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocTypeCheck">
            <property name="excludeScope" value="nothing"/>
            <property name="scope" value="private"/>
            <property name="severity" value="error"/>
            <property name="tokens" value="CLASS_DEF, INTERFACE_DEF"/>
            <property name="allowMissingParamTags" value="true"/>
        </module>
        
        <module name="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocVariableCheck">
            <property name="excludeScope" value="nothing"/>
            <property name="scope" value="private"/>
            <property name="severity" value="error"/>
        </module>
        
        <module name="com.puppycrawl.tools.checkstyle.checks.javadoc.JavadocMethodCheck">
            <property name="allowMissingParamTags" value="false"/>
            <property name="allowMissingReturnTag" value="false"/>
            <property name="allowMissingThrowsTags" value="false"/>
            <property name="allowThrowsTagsForSubclasses" value="false"/>
            <property name="allowUndeclaredRTE" value="true"/>
            <property name="allowMissingJavadoc" value="false"/>
            <property name="allowMissingPropertyJavadoc" value="true"/>
            <property name="excludeScope" value="nothing"/>
            <property name="scope" value="private"/>
            <property name="severity" value="error"/>
            <property name="tokens" value="METHOD_DEF, CTOR_DEF"/>
        </module>
        
        <module name="JavadocStyle">
            <property name="scope" value="private"/>
            <property name="checkHtml" value="false"/>
            <property name="checkFirstSentence" value="true"/>
            <property name="checkEmptyJavadoc" value="true"/>
        </module>
        
        <!-- These rules enforce the conventions for the naming of variables. -->        
        <!--
        <module name="com.puppycrawl.tools.checkstyle.checks.naming.ConstantNameCheck">
            <property name="format" value="^log$|^[A-Z](_?[A-Z0-9]+)*$"/>
            <property name="severity" value="error"/>
        </module>
        
        <module name="com.puppycrawl.tools.checkstyle.checks.naming.LocalFinalVariableNameCheck">
            <property name="format" value="^[a-z][a-zA-Z0-9_]*$"/>
            <property name="severity" value="error"/>
        </module>
        
        <module name="com.puppycrawl.tools.checkstyle.checks.naming.LocalVariableNameCheck">
            <property name="format" value="^[a-z][a-zA-Z0-9_]*$"/>
            <property name="severity" value="error"/>
        </module>
        
        <module name="com.puppycrawl.tools.checkstyle.checks.naming.MemberNameCheck">
            <property name="applyToPackage" value="true"/>
            <property name="applyToPrivate" value="true"/>
            <property name="applyToProtected" value="true"/>
            <property name="applyToPublic" value="true"/>
            <property name="format" value="^[a-z][a-zA-Z0-9_]*$"/>
            <property name="severity" value="error"/>
        </module>
        
        <module name="com.puppycrawl.tools.checkstyle.checks.naming.MethodNameCheck">
            <property name="format" value="^[a-z][a-zA-Z0-9_]*$"/>
            <property name="severity" value="error"/>
        </module>
        
        <module name="com.puppycrawl.tools.checkstyle.checks.naming.PackageNameCheck">
            <property name="format" value="^[a-z]+(\.[a-zA-Z_][a-zA-Z0-9_]*)*$"/>
            <property name="severity" value="error"/>
        </module>
        
        <module name="com.puppycrawl.tools.checkstyle.checks.naming.ParameterNameCheck">
            <property name="format" value="^[a-z][a-zA-Z0-9_]*$"/>
            <property name="severity" value="error"/>
        </module>
        
        <module name="com.puppycrawl.tools.checkstyle.checks.naming.StaticVariableNameCheck">
            <property name="format" value="^[a-z][a-zA-Z0-9_]*$"/>
            <property name="severity" value="error"/>
        </module>
        
        <module name="com.puppycrawl.tools.checkstyle.checks.naming.TypeNameCheck">
            <property name="format" value="^[A-Z][a-zA-Z0-9_]*$"/>
            <property name="severity" value="error"/>
            <property name="tokens" value="CLASS_DEF, INTERFACE_DEF"/>
        </module>
        -->
    </module>
</module>