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<li class="sidebarTitle">PMD 7.8.0-SNAPSHOT</li>
<div class="sidebarTitleDate">Release date: 29-November-2024</div>
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</ul>
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<li><a href="pmd_rules_ecmascript.html">Index</a></li>
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</ul>
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<li><a href="pmd_rules_kotlin.html">Index</a></li>
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</ul>
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</ul>
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<a href="#">Scala Rules</a>
<ul>
<li><a href="pmd_rules_scala.html">Index</a></li>
</ul>
</li>
<li class="subfolders">
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</ul>
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<a href="#">Velocity Template Language (VTL) Rules</a>
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<li><a href="pmd_rules_velocity.html">Index</a></li>
<li><a href="pmd_rules_velocity_bestpractices.html">Best Practices</a></li>
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</ul>
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<li><a href="pmd_rules_wsdl.html">Index</a></li>
</ul>
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</ul>
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<li><a href="pmd_rules_xsl_codestyle.html">Code Style</a></li>
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</ul>
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</ul>
</li>
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» Documentation
<a
target="_blank"
href="https://github.com/pmd/pmd/blob/main/docs/../pmd-java/src/main/resources/category/java/documentation.xml"
class="float-right"
role="button"
><i class="fab fa-github fa-lg"></i> Edit on GitHub</a
>
</div>
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<hr />
</header>
<div class="post-header">
<h1 class="post-title-main">Documentation</h1>
</div>
<div class="post-content" data-github-edit-url="https://github.com/pmd/pmd/blob/main/docs/../pmd-java/src/main/resources/category/java/documentation.xml">
<div class="summary">Rules that are related to code documentation.</div>
<details id="inline-toc-details">
<summary>Table of Contents</summary>
<div id="inline-toc"><!-- empty, move TOC here when screen size too small --></div>
</details>
<!-- DO NOT EDIT THIS FILE. This file is generated from file ../pmd-java/src/main/resources/category/java/documentation.xml. -->
<h2 id="commentcontent">CommentContent</h2>
<p><strong>Since:</strong> PMD 5.0</p>
<p><strong>Priority:</strong> Medium (3)</p>
<p>A rule for the politically correct… we don’t want to offend anyone.</p>
<p><strong>This rule is defined by the following Java class:</strong> <a href="https://github.com/pmd/pmd/blob/main/pmd-java/src/main/java/net/sourceforge/pmd/lang/java/rule/documentation/CommentContentRule.java">net.sourceforge.pmd.lang.java.rule.documentation.CommentContentRule</a></p>
<p><strong>Example(s):</strong></p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="c1">//OMG, this is horrible, Bob is an idiot !!!</span>
</code></pre></div></div>
<p><strong>This rule has the following properties:</strong></p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Default Value</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>forbiddenRegex</td>
<td>idiot|jerk</td>
<td>Illegal terms or phrases</td>
</tr>
</tbody>
</table>
<p><strong>Use this rule with the default properties by just referencing it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/java/documentation.xml/CommentContent"</span> <span class="nt">/&gt;</span>
</code></pre></div></div>
<p><strong>Use this rule and customize it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/java/documentation.xml/CommentContent"</span><span class="nt">&gt;</span>
<span class="nt">&lt;properties&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"forbiddenRegex"</span> <span class="na">value=</span><span class="s">"idiot|jerk"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/properties&gt;</span>
<span class="nt">&lt;/rule&gt;</span>
</code></pre></div></div>
<h2 id="commentrequired">CommentRequired</h2>
<p><strong>Since:</strong> PMD 5.1</p>
<p><strong>Priority:</strong> Medium (3)</p>
<p>Denotes whether javadoc (formal) comments are required (or unwanted) for specific language elements.</p>
<p><strong>This rule is defined by the following Java class:</strong> <a href="https://github.com/pmd/pmd/blob/main/pmd-java/src/main/java/net/sourceforge/pmd/lang/java/rule/documentation/CommentRequiredRule.java">net.sourceforge.pmd.lang.java.rule.documentation.CommentRequiredRule</a></p>
<p><strong>Example(s):</strong></p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cm">/**
*
*
* @author Jon Doe
*/</span>
</code></pre></div></div>
<p><strong>This rule has the following properties:</strong></p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Default Value</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>methodWithOverrideCommentRequirement</td>
<td>Ignored</td>
<td>Comments on @Override methods. Possible values: [Required, Ignored, Unwanted]</td>
</tr>
<tr>
<td>accessorCommentRequirement</td>
<td>Ignored</td>
<td>Comments on getters and setters". Possible values: [Required, Ignored, Unwanted]</td>
</tr>
<tr>
<td>classCommentRequirement</td>
<td>Required</td>
<td>Class comments. Possible values: [Required, Ignored, Unwanted]</td>
</tr>
<tr>
<td>fieldCommentRequirement</td>
<td>Required</td>
<td>Field comments. Possible values: [Required, Ignored, Unwanted]</td>
</tr>
<tr>
<td>publicMethodCommentRequirement</td>
<td>Required</td>
<td>Public method and constructor comments. Possible values: [Required, Ignored, Unwanted]</td>
</tr>
<tr>
<td>protectedMethodCommentRequirement</td>
<td>Required</td>
<td>Protected method constructor comments. Possible values: [Required, Ignored, Unwanted]</td>
</tr>
<tr>
<td>enumCommentRequirement</td>
<td>Required</td>
<td>Enum comments. Possible values: [Required, Ignored, Unwanted]</td>
</tr>
<tr>
<td>serialVersionUIDCommentRequired</td>
<td>Ignored</td>
<td>Serial version UID comments. Possible values: [Required, Ignored, Unwanted]</td>
</tr>
<tr>
<td>serialPersistentFieldsCommentRequired</td>
<td>Ignored</td>
<td>Serial persistent fields comments. Possible values: [Required, Ignored, Unwanted]</td>
</tr>
</tbody>
</table>
<p><strong>Use this rule with the default properties by just referencing it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/java/documentation.xml/CommentRequired"</span> <span class="nt">/&gt;</span>
</code></pre></div></div>
<p><strong>Use this rule and customize it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/java/documentation.xml/CommentRequired"</span><span class="nt">&gt;</span>
<span class="nt">&lt;properties&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"methodWithOverrideCommentRequirement"</span> <span class="na">value=</span><span class="s">"Ignored"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"accessorCommentRequirement"</span> <span class="na">value=</span><span class="s">"Ignored"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"classCommentRequirement"</span> <span class="na">value=</span><span class="s">"Required"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"fieldCommentRequirement"</span> <span class="na">value=</span><span class="s">"Required"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"publicMethodCommentRequirement"</span> <span class="na">value=</span><span class="s">"Required"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"protectedMethodCommentRequirement"</span> <span class="na">value=</span><span class="s">"Required"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"enumCommentRequirement"</span> <span class="na">value=</span><span class="s">"Required"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"serialVersionUIDCommentRequired"</span> <span class="na">value=</span><span class="s">"Ignored"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"serialPersistentFieldsCommentRequired"</span> <span class="na">value=</span><span class="s">"Ignored"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/properties&gt;</span>
<span class="nt">&lt;/rule&gt;</span>
</code></pre></div></div>
<h2 id="commentsize">CommentSize</h2>
<p><strong>Since:</strong> PMD 5.0</p>
<p><strong>Priority:</strong> Medium (3)</p>
<p>Determines whether the dimensions of non-header comments found are within the specified limits.</p>
<p><strong>This rule is defined by the following Java class:</strong> <a href="https://github.com/pmd/pmd/blob/main/pmd-java/src/main/java/net/sourceforge/pmd/lang/java/rule/documentation/CommentSizeRule.java">net.sourceforge.pmd.lang.java.rule.documentation.CommentSizeRule</a></p>
<p><strong>Example(s):</strong></p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="cm">/**
*
* too many lines!
*
*
*
*
*
*
*
*
*
*
*
*
*/</span>
</code></pre></div></div>
<p><strong>This rule has the following properties:</strong></p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Default Value</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>maxLines</td>
<td>6</td>
<td>Maximum lines</td>
</tr>
<tr>
<td>maxLineLength</td>
<td>80</td>
<td>Maximum line length</td>
</tr>
</tbody>
</table>
<p><strong>Use this rule with the default properties by just referencing it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/java/documentation.xml/CommentSize"</span> <span class="nt">/&gt;</span>
</code></pre></div></div>
<p><strong>Use this rule and customize it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/java/documentation.xml/CommentSize"</span><span class="nt">&gt;</span>
<span class="nt">&lt;properties&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"maxLines"</span> <span class="na">value=</span><span class="s">"6"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"maxLineLength"</span> <span class="na">value=</span><span class="s">"80"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/properties&gt;</span>
<span class="nt">&lt;/rule&gt;</span>
</code></pre></div></div>
<h2 id="uncommentedemptyconstructor">UncommentedEmptyConstructor</h2>
<p><strong>Since:</strong> PMD 3.4</p>
<p><strong>Priority:</strong> Medium (3)</p>
<p>Uncommented Empty Constructor finds instances where a constructor does not
contain statements, but there is no comment. By explicitly commenting empty
constructors it is easier to distinguish between intentional (commented)
and unintentional empty constructors.</p>
<p><strong>This rule is defined by the following XPath expression:</strong></p>
<div class="language-xpath highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="o">//</span><span class="nt">ConstructorDeclaration</span><span class="p">[</span><span class="na">@Visibility</span><span class="w"> </span><span class="p">!</span><span class="err">=</span><span class="w"> </span><span class="s2">"private"</span><span class="p">]</span><span class="w">
</span><span class="p">[</span><span class="ow">not</span><span class="p">(</span><span class="w">
</span><span class="nn">pmd-java:</span><span class="nf">hasAnnotation</span><span class="p">(</span><span class="s1">'javax.inject.Inject'</span><span class="p">)</span><span class="w">
</span><span class="ow">or</span><span class="w"> </span><span class="nn">pmd-java:</span><span class="nf">hasAnnotation</span><span class="p">(</span><span class="s1">'org.springframework.beans.factory.annotation.Autowired'</span><span class="p">)</span><span class="w">
</span><span class="p">)]</span><span class="w">
</span><span class="p">[</span><span class="nt">Block</span><span class="p">[</span><span class="w">
</span><span class="na">@containsComment</span><span class="w"> </span><span class="err">=</span><span class="w"> </span><span class="nf">false</span><span class="p">()</span><span class="w">
</span><span class="ow">and</span><span class="w"> </span><span class="p">(</span><span class="nf">count</span><span class="p">(</span><span class="err">*</span><span class="p">)</span><span class="w"> </span><span class="err">=</span><span class="w"> </span><span class="m">0</span><span class="w"> </span><span class="ow">or</span><span class="w"> </span><span class="p">(</span><span class="nv">$ignoreExplicitConstructorInvocation</span><span class="w"> </span><span class="err">=</span><span class="w"> </span><span class="nf">true</span><span class="p">()</span><span class="w"> </span><span class="ow">and</span><span class="w"> </span><span class="nf">count</span><span class="p">(</span><span class="err">*</span><span class="p">)</span><span class="w"> </span><span class="err">=</span><span class="w"> </span><span class="m">1</span><span class="w"> </span><span class="ow">and</span><span class="w"> </span><span class="nt">ExplicitConstructorInvocation</span><span class="p">))</span><span class="w">
</span><span class="p">]]</span><span class="w">
</span></code></pre></div></div>
<p><strong>Example(s):</strong></p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">public</span> <span class="nf">Foo</span><span class="o">()</span> <span class="o">{</span>
<span class="c1">// This constructor is intentionally empty. Nothing special is needed here.</span>
<span class="o">}</span>
</code></pre></div></div>
<p><strong>This rule has the following properties:</strong></p>
<table>
<thead>
<tr>
<th>Name</th>
<th>Default Value</th>
<th>Description</th>
</tr>
</thead>
<tbody>
<tr>
<td>ignoreExplicitConstructorInvocation</td>
<td>false</td>
<td>Ignore explicit constructor invocation when deciding whether constructor is empty or not</td>
</tr>
</tbody>
</table>
<p><strong>Use this rule with the default properties by just referencing it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/java/documentation.xml/UncommentedEmptyConstructor"</span> <span class="nt">/&gt;</span>
</code></pre></div></div>
<p><strong>Use this rule and customize it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/java/documentation.xml/UncommentedEmptyConstructor"</span><span class="nt">&gt;</span>
<span class="nt">&lt;properties&gt;</span>
<span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"ignoreExplicitConstructorInvocation"</span> <span class="na">value=</span><span class="s">"false"</span> <span class="nt">/&gt;</span>
<span class="nt">&lt;/properties&gt;</span>
<span class="nt">&lt;/rule&gt;</span>
</code></pre></div></div>
<h2 id="uncommentedemptymethodbody">UncommentedEmptyMethodBody</h2>
<p><strong>Since:</strong> PMD 3.4</p>
<p><strong>Priority:</strong> Medium (3)</p>
<p>Uncommented Empty Method Body finds instances where a method body does not contain
statements, but there is no comment. By explicitly commenting empty method bodies
it is easier to distinguish between intentional (commented) and unintentional
empty methods.</p>
<p><strong>This rule is defined by the following XPath expression:</strong></p>
<div class="language-xpath highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="o">//</span><span class="nt">MethodDeclaration</span><span class="o">/</span><span class="nt">Block</span><span class="p">[</span><span class="nf">count</span><span class="p">(</span><span class="err">*</span><span class="p">)</span><span class="w"> </span><span class="err">=</span><span class="w"> </span><span class="m">0</span><span class="w"> </span><span class="ow">and</span><span class="w"> </span><span class="na">@containsComment</span><span class="w"> </span><span class="err">=</span><span class="w"> </span><span class="nf">false</span><span class="p">()]</span><span class="w">
</span></code></pre></div></div>
<p><strong>Example(s):</strong></p>
<div class="language-java highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">public</span> <span class="kt">void</span> <span class="nf">doSomething</span><span class="o">()</span> <span class="o">{</span>
<span class="o">}</span>
</code></pre></div></div>
<p><strong>Use this rule by referencing it:</strong></p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;rule</span> <span class="na">ref=</span><span class="s">"category/java/documentation.xml/UncommentedEmptyMethodBody"</span> <span class="nt">/&gt;</span>
</code></pre></div></div>
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