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property_types.html
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<!DOCTYPE html>
<!--
| Generated by Apache Maven Doxia Site Renderer 2.0.0 from src/site/xdoc/property_types.xml 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>Property Types – 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 class="active"><a>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><a href="anttask.html">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>
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<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>
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</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>
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<div class="clear"></div>
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</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="#Overview">Overview</a></li>
<li><a href="#boolean">boolean</a></li>
<li><a href="#byte">byte</a></li>
<li><a href="#byte.5B.5D">byte[]</a></li>
<li><a href="#char">char</a></li>
<li><a href="#char.5B.5D">char[]</a></li>
<li><a href="#double">double</a></li>
<li><a href="#double.5B.5D">double[]</a></li>
<li><a href="#float">float</a></li>
<li><a href="#float.5B.5D">float[]</a></li>
<li><a href="#int">int</a></li>
<li><a href="#int.5B.5D">int[]</a></li>
<li><a href="#long">long</a></li>
<li><a href="#long.5B.5D">long[]</a></li>
<li><a href="#short">short</a></li>
<li><a href="#short.5B.5D">short[]</a></li>
<li><a href="#AccessModifierOption.5B.5D">AccessModifierOption[]</a></li>
<li><a href="#BlockOption">BlockOption</a></li>
<li><a href="#ClosingParensOption">ClosingParensOption</a></li>
<li><a href="#ElementStyleOption">ElementStyleOption</a></li>
<li><a href="#File">File</a></li>
<li><a href="#ImportOrderOption">ImportOrderOption</a></li>
<li><a href="#JavadocContentLocationOption">JavadocContentLocationOption</a></li>
<li><a href="#LeftCurlyOption">LeftCurlyOption</a></li>
<li><a href="#LineSeparatorOption">LineSeparatorOption</a></li>
<li><a href="#PadOption">PadOption</a></li>
<li><a href="#Pattern">Pattern</a></li>
<li><a href="#Pattern.5B.5D">Pattern[]</a></li>
<li><a href="#RightCurlyOption">RightCurlyOption</a></li>
<li><a href="#Scope">Scope</a></li>
<li><a href="#SeverityLevel">SeverityLevel</a></li>
<li><a href="#String">String</a></li>
<li><a href="#String.5B.5D">String[]</a></li>
<li><a href="#TrailingArrayCommaOption">TrailingArrayCommaOption</a></li>
<li><a href="#URI">URI</a></li>
<li><a href="#WrapOption">WrapOption</a></li></ul>
</section>
<section><a id="Overview"></a>
<h1>Overview</h1>
<p>
Checkstyle is configured using properties, which are string
representations. This document describes how these string
representations are mapped to typed properties.
</p>
</section>
<section><a id="boolean"></a>
<h1>boolean</h1>
<p>
This type represents a boolean.
The following string representations will map to <code>true</code>:
</p>
<ul>
<li><code>yes</code></li>
<li><code>true</code></li>
<li><code>on</code></li>
</ul>
<p>Anything else will map to <code>false</code>.</p>
</section>
<section><a id="byte"></a>
<h1>byte</h1>
<p>
This type represents a byte. The string representation is
parsed using the <code>java.lang.Byte</code> class.
</p>
</section>
<section><a id="byte.5B.5D"></a>
<h1>byte[]</h1>
<p>
This type represents a set of bytes. The string representation
is parsed as a set of comma (',') separated bytes that are parsed
using the <code>java.lang.Byte</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated byte values.
</p>
</section>
<section><a id="char"></a>
<h1>char</h1>
<p>
This type represents a char. The string representation is
parsed using the <code>java.lang.Character</code> class.
</p>
</section>
<section><a id="char.5B.5D"></a>
<h1>char[]</h1>
<p>
This type represents a set of chars. The string representation
is parsed as a set of comma (',') separated chars that are parsed
using the <code>java.lang.Character</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated char values.
</p>
</section>
<section><a id="double"></a>
<h1>double</h1>
<p>
This type represents a double. The string representation is
parsed using the <code>java.lang.Double</code> class.
</p>
</section>
<section><a id="double.5B.5D"></a>
<h1>double[]</h1>
<p>
This type represents a set of doubles. The string representation
is parsed as a set of comma (',') separated doubles that are parsed
using the <code>java.lang.Double</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated integers. For example, the
following:
</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<property name="tokens" value="0.42,0.666"/>
</code></pre></div>
<p>can instead be expressed as:</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<property name="tokens" value="0.42"/>
<property name="tokens" value="0.666"/>
</code></pre></div>
</section>
<section><a id="float"></a>
<h1>float</h1>
<p>
This type represents a float. The string representation is
parsed using the <code>java.lang.Float</code> class.
</p>
</section>
<section><a id="float.5B.5D"></a>
<h1>float[]</h1>
<p>
This type represents a set of floats. The string representation
is parsed as a set of comma (',') separated floats that are parsed
using the <code>java.lang.Float</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated float values.
</p>
</section>
<section><a id="int"></a>
<h1>int</h1>
<p>
This type represents an integer. The string representation is
parsed using the <code>java.lang.Integer</code> class.
</p>
</section>
<section><a id="int.5B.5D"></a>
<h1>int[]</h1>
<p>
This type represents a set of integers. The string representation
is parsed as a set of comma (',') separated integers that are parsed
using the <code>java.lang.Integer</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated integers. For example, the
following:
</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<property name="tokens" value="42,666"/>
</code></pre></div>
<p>can instead be expressed as:</p>
<div class="wrapper">
<pre class="prettyprint"><code class="language-xml">
<property name="tokens" value="42"/>
<property name="tokens" value="666"/>
</code></pre></div>
</section>
<section><a id="long"></a>
<h1>long</h1>
<p>
This type represents a long. The string representation is
parsed using the <code>java.lang.Long</code> class.
</p>
</section>
<section><a id="long.5B.5D"></a>
<h1>long[]</h1>
<p>
This type represents a set of longs. The string representation
is parsed as a set of comma (',') separated longs that are parsed
using the <code>java.lang.Long</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated long values.
</p>
</section>
<section><a id="short"></a>
<h1>short</h1>
<p>
This type represents a short. The string representation is
parsed using the <code>java.lang.Short</code> class.
</p>
</section>
<section><a id="short.5B.5D"></a>
<h1>short[]</h1>
<p>
This type represents a set of shorts. The string representation
is parsed as a set of comma (',') separated shorts that are parsed
using the <code>java.lang.Short</code> class.
</p>
<p>
Alternatively, a property of this type can be supplied multiple times which
is equivalent to a set of comma separated short values.
</p>
</section>
<section><a id="AccessModifierOption.5B.5D"></a>
<h1>AccessModifierOption[]</h1>
<p>This type represents Java access modifiers.</p>
<ul>
<li><code>public</code></li>
<li><code>protected</code></li>
<li><code>package</code></li>
<li><code>private</code></li>
</ul>
</section>
<section><a id="BlockOption"></a>
<h1>BlockOption</h1>
<p>
This type represents the policy for checking block statements. The
following table describes the valid options:
</p>
<div class="wrapper">
<table class="table table-striped">
<tr class="a">
<td>Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td><code>text</code></td>
<td>
Require that there is some text in the block. For example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
catch (Exception ex) {
// This is a bad coding practice
}
</code></pre>
</div>
</td>
</tr>
<tr class="a">
<td><code>statement</code></td>
<td>
Require that there is a statement in the block. For example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
finally {
lock.release();
}
</code></pre>
</div>
</td>
</tr>
</table>
</div>
</section>
<section><a id="ClosingParensOption"></a>
<h1>ClosingParensOption</h1>
<p>
This type represents the policy for the styles for the ending
parenthesis. The following table describes the valid options:
</p>
<div class="wrapper">
<table class="table table-striped">
<tr class="a">
<td>Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td><code>always</code></td>
<td>
Example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">@Deprecated()
</code></pre>
</div>
</td>
</tr>
<tr class="a">
<td><code>never</code></td>
<td>
Example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">@Deprecated
</code></pre>
</div>
</td>
</tr>
<tr class="b">
<td><code>ignore</code></td>
<td>
Anything goes.
</td>
</tr>
</table>
</div>
</section>
<section><a id="ElementStyleOption"></a>
<h1>ElementStyleOption</h1>
<p>
This type represents the policy for the styles for defining
elements in an annotation. The following table
describes the valid options:
</p>
<div class="wrapper">
<table class="table table-striped">
<tr class="a">
<td>Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td><code>expanded</code></td>
<td>
The expanded version is sometimes referred to as "named parameters"
in other languages.
Example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">@SuppressWarnings(value={"unchecked","unused",})
</code></pre>
</div>
Example of violation:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">@SuppressWarnings({"unchecked","unused",})
</code></pre>
</div>
</td>
</tr>
<tr class="a">
<td><code>compact</code></td>
<td>
This style can only be used when there is an element called 'value'
which is either the sole element or all other elements have default
values.
Example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
@SuppressWarnings({"unchecked","unused",})
@SuppressWarnings("unchecked")
</code></pre>
</div>
Example of violation:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
@SuppressWarnings(value = {"unchecked","unused",})
@SuppressWarnings(value = "unchecked")
</code></pre>
</div>
</td>
</tr>
<tr class="b">
<td><code>compact_no_array</code></td>
<td>
It is similar to the <code>compact</code> style but
single value arrays are flagged. With annotations a single value
array does not need to be placed in an array initializer.
Example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
@SuppressWarnings("unchecked")
@MyAnnotation(someArray = "some value")
</code></pre>
</div>
Example of violation:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
@SuppressWarnings({"unchecked"})
@MyAnnotation(someArray = {"some value"})
</code></pre>
</div>
</td>
</tr>
<tr class="a">
<td><code>ignore</code></td>
<td>
Anything goes.
</td>
</tr>
</table>
</div>
</section>
<section><a id="File"></a>
<h1>File</h1>
<p>
This type represents a local file. Unlike the <a href="#URI">uri</a> type,
which implies read only and not modifiable access to the resource,
a property of this type indicates files whose contents can be modified by Checkstyle.
</p>
</section>
<section><a id="ImportOrderOption"></a>
<h1>ImportOrderOption</h1>
<p>
This type represents the policy for checking imports order.
The following table describes the valid options:
</p>
<div class="wrapper">
<table class="table table-striped">
<tr class="a">
<td>Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td><code>top</code></td>
<td>All static imports are at the top.
Groups for static import are defined by the property 'staticGroups'.
The blank line between groups is driven by the property 'separatedStaticGroups'.
For example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
import static a.b.C.*;
import static x.y.Z.*;
import a.b.D;
import x.y.Z;</code></pre>
</div>
</td>
</tr>
<tr class="a">
<td><code>above</code></td>
<td>All static imports are above the local group. For example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
import static a.b.C.*;
import a.b.D;
import static x.y.Z.*;
import x.y.Z;</code></pre>
</div>
</td>
</tr>
<tr class="b">
<td><code>inflow</code></td>
<td>All static imports are processed like non static
imports. For example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
import static a.b.C.*;
import a.b.D;
import x.y.Z;
import static x.y.Z.*;</code></pre>
</div>
</td>
</tr>
<tr class="a">
<td><code>under</code></td>
<td>All static imports are under the local group. For example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
import a.b.D;
import static a.b.C.*;
import x.y.Z;
import static x.y.Z.*;</code></pre>
</div>
</td>
</tr>
<tr class="b">
<td><code>bottom</code></td>
<td>All static imports are at the bottom.
Groups for static import are defined by the property 'staticGroups'.
The blank line between groups is driven by the property 'separatedStaticGroups'.
For example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
import a.b.D;
import x.y.Z;
import static a.b.C.*;
import static x.y.Z.*;</code></pre>
</div>
</td>
</tr>
</table>
</div>
</section>
<section><a id="JavadocContentLocationOption"></a>
<h1>JavadocContentLocationOption</h1>
<p>
This type represents policy on placement of the Javadoc content.
The following table describes the valid options:
</p>
<div class="wrapper">
<table class="table table-striped">
<tr class="a">
<td>Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td><code>FIRST_LINE</code></td>
<td>
Represents the policy for Javadoc content starts from the same line
as <code>/**</code>.
Example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
/** Summary text.
* More details.
*/
public void method();
</code></pre>
</div>
This style is also known as "scala" style.
</td>
</tr>
<tr class="a">
<td><code>SECOND_LINE</code></td>
<td>
Represents the policy for Javadoc content starts from the next line
after <code>/**</code>.
Example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
/**
* Summary text.
* More details.
*/
public void method();
</code></pre>
</div>
This style is common to java projects.
</td>
</tr>
</table>
</div>
</section>
<section><a id="LeftCurlyOption"></a>
<h1>LeftCurlyOption</h1>
<p>
This type represents the policy for checking the placement of a
left curly brace (<code>'{'</code>). The following table
describes the valid options:
</p>
<div class="wrapper">
<table class="table table-striped">
<tr class="a">
<td>Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td><code>eol</code></td>
<td>
The brace must always be on the end of the line. For example:#
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
if (condition) {
...
</code></pre>
</div>
</td>
</tr>
<tr class="a">
<td><code>nl</code></td>
<td>
The brace must always be on a new line. For example:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
if (condition)
{
...
</code></pre>
</div>
</td>
</tr>
<tr class="b">
<td><code>nlow</code></td>
<td>
If the statement/expression/declaration connected to the brace spans multiple lines,
then apply <code>nl</code> rule. Otherwise, apply the <code>eol</code> rule.
<code>nlow</code> is a mnemonic for "new line on wrap".
For the example above Checkstyle will enforce:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
if (condition) {
...
</code></pre>
</div>
But for a statement spanning multiple lines, Checkstyle will
enforce:
<div class="wrapper">
<pre class="prettyprint"><code class="language-java">
if (condition1 && condition2 &&
condition3 && condition4)
{
...
</code></pre>
</div>
</td>
</tr>
</table>
</div>
</section>
<section><a id="LineSeparatorOption"></a>
<h1>LineSeparatorOption</h1>
<p>
This type represents the policy for line returns. The
following table describes the valid options:
</p>
<div class="wrapper">
<table class="table table-striped">
<tr class="a">
<td>Option</td>
<td>Definition</td>
</tr>
<tr class="b">
<td><code>crlf</code></td>
<td>Windows-style</td>
</tr>
<tr class="a">
<td><code>cr</code></td>
<td>Mac-style</td>
</tr>
<tr class="b">
<td><code>lf</code></td>
<td>Unix-style</td>
</tr>
<tr class="a">