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<!DOCTYPE html>
<!--
| Generated by Apache Maven Doxia Site Renderer 2.0.0 from src/site/xdoc/anttask.xml.vm at 2025-04-02
| Rendered using Apache Maven Fluido Skin 2.0.1
-->
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta name="generator" content="Apache Maven Doxia Site Renderer 2.0.0" />
<title>Ant Task – checkstyle</title>
<link rel="stylesheet" href="./css/apache-maven-fluido-2.0.1.min.css" />
<link rel="stylesheet" href="./css/site.css" />
<link rel="stylesheet" href="./css/print.css" media="print" />
<script src="./js/apache-maven-fluido-2.0.1.min.js"></script>
<script type="text/javascript" src="./js/checkstyle.js"></script>
<script type="text/javascript" src="./js/anchors.js"></script>
<script type="text/javascript" src="./js/google-analytics.js"></script>
<script type="text/javascript" src="./js/copy-clipboard.js"></script>
<link rel="icon" href="./images/favicon.png" type="image/x-icon" />
<link rel="shortcut icon" href="./images/favicon.ico" type="image/ico" />
</head>
<body>
<div class="container-fluid container-fluid-top">
<header>
<div id="banner">
<div class="pull-left"><div id="bannerLeft"><h1><a href="./"><img class="class java.lang.Object" src="images/header-checkstyle-logo.png" alt="Checkstyle" /></a></h1></div></div>
<div class="pull-right"><div id="bannerRight"><h1><img class="class java.lang.Object" src="images/header-right-ruller.png" alt="Checkstyle" /></h1></div></div>
<div class="clear"><hr/></div>
</div>
<div id="breadcrumbs">
<ul class="breadcrumb">
<li id="publishDate" class="pull-right"><span class="divider">|</span> Last Published: 2025-04-02</li>
<li id="projectVersion" class="pull-right"><span class="divider">|</span>Version: 10.23.0</li>
<li class="pull-right"><a>toTop</a></li>
</ul>
</div>
</header>
<div class="row-fluid">
<header id="leftColumn" class="span2">
<nav class="well sidebar-nav">
<ul class="nav nav-list">
<li class="nav-header">About</li>
<li><a href="index.html">Checkstyle</a></li>
<li><a href="releasenotes.html">Release Notes</a></li>
<li><a href="consulting.html">Consulting</a></li>
<li><a href="sponsoring.html">Sponsoring</a></li>
<li class="nav-header">Documentation</li>
<li><a href="config.html"><span class="icon-chevron-down"></span>Configuration</a>
<ul class="nav nav-list">
<li><a href="property_types.html">Property Types</a></li>
<li><a href="config_system_properties.html">System Properties</a></li>
</ul></li>
<li><a href="running.html"><span class="icon-chevron-down"></span>Running</a>
<ul class="nav nav-list">
<li class="active"><a>Ant Task</a></li>
<li><a href="cmdline.html">Command Line</a></li>
</ul></li>
<li><a href="checks.html"><span class="icon-chevron-down"></span>Checks</a>
<ul class="nav nav-list">
<li><a href="checks/annotation/index.html"><span class="icon-chevron-right"></span>Annotations</a></li>
<li><a href="checks/blocks/index.html"><span class="icon-chevron-right"></span>Block Checks</a></li>
<li><a href="checks/design/index.html"><span class="icon-chevron-right"></span>Class Design</a></li>
<li><a href="checks/coding/index.html"><span class="icon-chevron-right"></span>Coding</a></li>
<li><a href="checks/header/index.html"><span class="icon-chevron-right"></span>Headers</a></li>
<li><a href="checks/imports/index.html"><span class="icon-chevron-right"></span>Imports</a></li>
<li><a href="checks/javadoc/index.html"><span class="icon-chevron-right"></span>Javadoc Comments</a></li>
<li><a href="checks/metrics/index.html"><span class="icon-chevron-right"></span>Metrics</a></li>
<li><a href="checks/misc/index.html"><span class="icon-chevron-right"></span>Miscellaneous</a></li>
<li><a href="checks/modifier/index.html"><span class="icon-chevron-right"></span>Modifiers</a></li>
<li><a href="checks/naming/index.html"><span class="icon-chevron-right"></span>Naming Conventions</a></li>
<li><a href="checks/regexp/index.html"><span class="icon-chevron-right"></span>Regexp</a></li>
<li><a href="checks/sizes/index.html"><span class="icon-chevron-right"></span>Size Violations</a></li>
<li><a href="checks/whitespace/index.html"><span class="icon-chevron-right"></span>Whitespace</a></li>
</ul></li>
<li><a href="filters/index.html"><span class="icon-chevron-right"></span>Filters</a></li>
<li><a href="filefilters/index.html"><span class="icon-chevron-right"></span>File Filters</a></li>
<li><a href="style_configs.html"><span class="icon-chevron-down"></span>Style Configurations</a>
<ul class="nav nav-list">
<li><a href="google_style.html">Google's Style</a></li>
<li><a href="sun_style.html">Sun's Style</a></li>
</ul></li>
<li class="nav-header">Developers</li>
<li><a href="extending.html"><span class="icon-chevron-down"></span>Extending Checkstyle</a>
<ul class="nav nav-list">
<li><a href="writingchecks.html">Writing Checks</a></li>
<li><a href="writingjavadocchecks.html">Writing Javadoc Checks</a></li>
<li><a href="writingfilters.html">Writing Filters</a></li>
<li><a href="writingfilefilters.html">Writing File Filters</a></li>
<li><a href="writinglisteners.html">Writing Listeners</a></li>
</ul></li>
<li><a href="contributing.html">Contributing</a></li>
<li><a href="beginning_development.html"><span class="icon-chevron-down"></span>Beginning Development</a>
<ul class="nav nav-list">
<li><a href="eclipse.html">Eclipse IDE</a></li>
<li><a href="netbeans.html">NetBeans IDE</a></li>
<li><a href="idea.html">IntelliJ IDE</a></li>
</ul></li>
<li><a href="apidocs/index.html">Javadoc</a></li>
<li class="nav-header">Project Documentation</li>
<li><a href="project-info.html"><span class="icon-chevron-right"></span>Project Information</a></li>
<li><a href="project-reports.html"><span class="icon-chevron-right"></span>Project Reports</a></li>
</ul>
</nav>
<div class="well sidebar-nav">
<div id="poweredBy">
<div class="clear"></div>
<div class="clear"></div>
<a href="https://github.com/checkstyle/checkstyle" class="builtBy"><img class="builtBy" src="images/github_logo_social_coding_outlined.png" alt="GitHub" /></a>
<a href="https://twitter.com/checkstyle_java/" class="builtBy"><img class="builtBy" src="images/twitter_button.png" alt="Twitter" /></a>
<a href="https://stackoverflow.com/questions/tagged/checkstyle" class="builtBy"><img class="builtBy" src="images/stackoverflow.jpeg" alt="Stackoverflow" /></a>
<a href="https://groups.google.com/forum/#!forum/checkstyle" class="builtBy"><img class="builtBy" src="images/groups.png" alt="GoogleGroups" /></a>
<a href="https://www.ej-technologies.com/products/jprofiler/overview.html" class="builtBy"><img class="builtBy" src="https://www.ej-technologies.com/images/product_banners/jprofiler_medium.png" alt="JProfiler" /></a>
</div>
</div>
</header>
<main id="bodyColumn" class="span10">
<section><a id="Content"></a>
<h1>Content</h1>
<ul>
<li><a href="#Content">Content</a></li>
<li><a href="#Description">Description</a></li>
<li><a href="#Installation">Installation</a></li>
<li><a href="#Parameters">Parameters</a></li>
<li><a href="#Nested_Elements">Nested Elements</a></li>
<li><a href="#Examples">Examples</a></li></ul>
</section>
<section><a id="Description"></a>
<h1>Description</h1>
<p>
This task runs Checkstyle over specified Java files.
The latest version of checkstyle can be found at
<a href="./index.html">https://checkstyle.org/</a>.
This task is included in the checkstyle distribution.
</p>
</section>
<section><a id="Installation"></a>
<h1>Installation</h1>
<p>
The easiest way is to include
<code>checkstyle-10.23.0-all.jar</code> in the
classpath. This contains all the classes required to run
Checkstyle. Alternatively, you must include the
<code>compile</code> third party dependencies listed in <a href="dependencies.html">Project Dependencies</a> in the
classpath.
</p>
<p>
To use the task in a build file, you will need the following
<code>taskdef</code> declaration:
</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<taskdef resource="com/puppycrawl/tools/checkstyle/ant/checkstyle-ant-task.properties"
classpath="/path/to/checkstyle-10.23.0-all.jar"/>
</code></pre></div>
<p>
Or, assuming that Checkstyle is in the global classpath (not
recommended), then you will need the following <code>taskdef</code>
declaration:
</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<taskdef
resource="com/puppycrawl/tools/checkstyle/ant/checkstyle-ant-task.properties"/>
</code></pre></div>
<p>
Or if you use Ant 1.6 and later and assuming that Checkstyle
is in the library search path, then you may use antlib feature
of Ant (see <a href="https://ant.apache.org/manual/Types/antlib.html" class="externalLink">https://ant.apache.org/manual/Types/antlib.html</a>
for more details). For example:
</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<project name="foo" ...
xmlns:cs="antlib:com.puppycrawl.tools.checkstyle.ant">
...
<cs:checkstyle>
...
</cs:checkstyle>
...
</project>
</code></pre></div>
</section>
<section><a id="Parameters"></a>
<h1>Parameters</h1>
<div class="wrapper">
<table class="table table-striped">
<tr class="a">
<td><b>Attribute</b></td>
<td><b>Description</b></td>
<td><b>Required</b></td>
</tr>
<tr class="b">
<td>file</td>
<td>File to run checkstyle on.</td>
<td>
One of either <i>file</i> or at least one nested <i>fileset</i> or <i>path</i>
element
</td>
</tr>
<tr class="a">
<td>fileset</td>
<td>
A set of files to run checkstyle on. Nested attribute.
See <a href="https://ant.apache.org/manual/Types/fileset.html" class="externalLink">fileset</a>
ant documentation for details
</td>
<td>
One of either <i>file</i> or at least one nested <i>fileset</i> or <i>path</i>
element
</td>
</tr>
<tr class="b">
<td>path</td>
<td>
A set of path to run checkstyle on. Nested attribute.
See <a href="https://ant.apache.org/manual/using.html#path" class="externalLink">path</a>
ant documentation for details
</td>
<td>
One of either <i>file</i> or at least one nested <i>fileset</i> or <i>path</i>
element
</td>
</tr>
<tr class="a">
<td>config</td>
<td>
Specifies the location of the file, URL, or Java resource that defines the
configuration modules.
<br />
<a href="config.html">See here</a> for a description of how to
define a configuration.
</td>
<td>Exactly one config location</td>
</tr>
<tr class="b">
<td>properties</td>
<td>
Specifies a file that contains properties for <a href="config.html#Properties"> expanded property values</a> of the
configuration. Ant properties (like ${basedir}) and nested
property elements override the properties in this file.
</td>
<td>No</td>
</tr>
<tr class="a">
<td>failOnViolation</td>
<td>
Specifies whether the build will continue even if there are
violations. Defaults to <code>"true"</code>.
</td>
<td>No</td>
</tr>
<tr class="b">
<td>failureProperty</td>
<td>The name of a property to set in the event of a violation.</td>
<td>No</td>
</tr>
<tr class="a">
<td>maxErrors</td>
<td>
The maximum number of errors that are tolerated before
breaking the build or setting the failure property. Defaults
to <code>"0"</code>.
</td>
<td>No</td>
</tr>
<tr class="b">
<td>maxWarnings</td>
<td>
The maximum number of warnings that are tolerated before
breaking the build or setting the failure property. Defaults
to <code>"2147483647"</code>, i.e.
<a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html#MAX_VALUE" class="externalLink">
Integer.MAX_VALUE</a>.
</td>
<td>No</td>
</tr>
<tr class="a">
<td>executeIgnoredModules</td>
<td>
For efficiency, Checkstyle does not invoke modules with a configured severity of
"ignore" (since their output would be ignored anyway). A small number of modules
may choose to log above their configured severity level and so always need to be
invoked. These settings specify that behaviour.
Defaults to <code>"false"</code>.
</td>
<td>No</td>
</tr>
</table>
</div>
<p>
Note that the <code>packageNamesFile</code>
parameter has been dropped for Checkstyle 5.0, because of
significant changes regarding package name file handling. See <a href="config.html#Packages"></a> for details.
</p>
<p>
Also note, that checkstyle ignores all duplicate files,
specified in the <i>file</i>, <i>fileset</i> or <i>path</i> parameters
</p>
</section>
<section><a id="Nested_Elements"></a>
<h1>Nested Elements</h1>
<p>
This task supports the nested elements <a href="https://ant.apache.org/manual/Types/fileset.html" class="externalLink"><fileset></a>,
<a href="https://ant.apache.org/manual/using.html#path" class="externalLink"><classpath></a>,
<a href="https://ant.apache.org/manual/using.html#path" class="externalLink"><path></a>,
<code><formatter></code>, and <code><property></code>.
</p>
<p>
The parameters for the <code><formatter></code>
element are:
</p>
<div class="wrapper">
<table class="table table-striped">
<tr class="a">
<td><b>Attribute</b></td>
<td><b>Description</b></td>
<td><b>Required</b></td>
</tr>
<tr class="b">
<td>type</td>
<td>
<p>The type of output to generate. The valid values are:</p>
<ul>
<li>
<code>plain</code> - specifies the <a href="apidocs/com/puppycrawl/tools/checkstyle/DefaultLogger.html">
DefaultLogger</a>
</li>
<li>
<code>xml</code> - specifies the <a href="apidocs/com/puppycrawl/tools/checkstyle/XMLLogger.html">XMLLogger</a>
</li>
<li>
<code>sarif</code> - specifies the <a href="apidocs/com/puppycrawl/tools/checkstyle/SarifLogger.html">SarifLogger</a>
</li>
</ul>
<p>Defaults to <code>"plain"</code>.</p>
</td>
<td>No</td>
</tr>
<tr class="a">
<td>toFile</td>
<td>
The file to write output to. Defaults to standard output. Note,
there is no way to explicitly specify standard output.
</td>
<td>No</td>
</tr>
<tr class="b">
<td>useFile</td>
<td>Boolean that determines whether output should be sent to
a file. Default is <code>true</code>.</td>
<td>No</td>
</tr>
</table>
</div>
<p>
A <code><property></code> element provides a property for
<a href="config.html#Properties">expanded property values</a> of
the configuration. The parameters for the
<code><property></code> element are:
</p>
<div class="wrapper">
<table class="table table-striped">
<tr class="a">
<td><b>Attribute</b></td>
<td><b>Description</b></td>
<td><b>Required</b></td>
</tr>
<tr class="b">
<td>key</td>
<td>
<p>The key for the property.</p></td>
<td>Yes</td>
</tr>
<tr class="a">
<td>value</td>
<td>The value of the property specified as a string.</td>
<td>Either <i>value</i> or <i>file</i></td>
</tr>
<tr class="b">
<td>file</td>
<td>
The value of the property specified as a file. This is great for
specifying file names relative to the ANT build file.
</td>
<td>Either <i>value</i> or <i>file</i></td>
</tr>
</table>
</div>
</section>
<section><a id="Examples"></a>
<h1>Examples</h1>
<p>
An example project can be found
<a href="https://github.com/sevntu-checkstyle/checkstyle-samples/tree/master/ant-project" class="externalLink">
here</a>.
</p>
<p>
<b>
Checkstyle use ant configuration to validate its own code. See example is our git
repository -
<a href="https://github.com/checkstyle/checkstyle/blob/master/config/ant-phase-verify.xml#L25" class="externalLink">
config/ant-phase-verify.xml</a>.
</b>
</p>
<p>
<b>
Run checkstyle with configuration file
<code>docs/sun_checks.xml</code> on a single file
</b>
</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<checkstyle config="docs/sun_checks.xml" file="Check.java"/>
</code></pre></div>
<p>
<b>
Run checkstyle on a set of Java files using site-wide configuration
and an expanded property value
</b>
</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<checkstyle config="/path/to/site/sun_checks.xml">
<fileset dir="src/checkstyle" includes="**/*.java"/>
<!-- Location of cache-file. Something that is project specific -->
<property key="checkstyle.cache.file" file="target/cachefile"/>
</checkstyle>
</code></pre></div>
<p>
<b>
Run checkstyle on a previously defined source path.
</b>
</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<!-- Somewhere in your config -->
<path id="project.sourcepath">
<fileset dir="src"
includes="**/*"
excludes="it/resources/**/*,test/resources/**/*,test/resources-noncompilable/**/*"/>
</path>
<!-- Actual checkstyle config -->
<checkstyle config="/path/to/site/sun_checks.xml">
<!-- Refer to a previously defined source path -->
<path refid="project.sourcepath" />
</checkstyle>
</code></pre></div>
<p>
<b>
Run checkstyle on a set of files and output messages to standard
output in plain format, and files in XML & SARIF format
</b>
</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<checkstyle config="docs/sun_checks.xml">
<fileset dir="src/checkstyle" includes="**/*.java"/>
<formatter type="plain"/>
<formatter type="xml" toFile="build/checkstyle_errors.xml"/>
<formatter type="sarif" toFile="build/checkstyle_errors.sarif"/>
</checkstyle>
</code></pre></div>
<p>
<b>
Run checkstyle with configuration file
<code>docs/sun_checks.xml</code> on a file and provide a package
names file
</b>
</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<checkstyle config="docs/sun_checks.xml"
packageNamesFile="myPackageNames.xml"
file="Check.java"/>
</code></pre></div>
<p>
<b>
Run checkstyle in an automated build and send an email report if
style violations are detected
</b>
</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<target name="checkstyle"
description="Generates a report of code convention violations.">
<checkstyle config="docs/sun_checks.xml"
failureProperty="checkstyle.failure"
failOnViolation="false">
<formatter type="xml" tofile="checkstyle_report.xml"/>
<fileset dir="src" includes="**/*.java"/>
</checkstyle>
<style in="checkstyle_report.xml" out="checkstyle_report.html"
style="checkstyle.xsl"/>
</target>
<!-- run this target as part of automated build -->
<target name="checkstyle-nightly"
depends="checkstyle"
if="checkstyle.failure"
description="Sends email if checkstyle detected code conventions violations.">
<!-- use your own server and email addresses below. See Ant documentation for details -->
<mail from="[email protected]"
tolist="[email protected],[email protected]"
mailhost="mailbox.some.domain"
subject="Checkstyle violation(s) in project ${ant.project.name}"
files="checkstyle_report.html"/>
</target>
</code></pre></div>
<p>
<b>
To run checkstyle with a custom JAR with implementation of custom Checks
be sure the custom JAR is found on the classpath. An example can be found at
<a href="https://github.com/sevntu-checkstyle/checkstyle-samples/tree/master/ant-project" class="externalLink">
checkstyle-samples</a>.
</b>
</p>
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