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» Configuring rules
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<div class="post-header">
<h1 class="post-title-main">Configuring rules</h1>
</div>
<div class="post-content" data-github-edit-url="https://github.com/pmd/pmd/blob/main/docs/pages/pmd/userdocs/configuring_rules.md">
<div class="summary">Learn how to configure your rules directly from the ruleset XML.</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>
<h2 id="message-and-priority-overriding">Message and priority overriding</h2>
<p>You can change a rules <strong>message</strong> by specifying a <code class="language-plaintext highlighter-rouge">message</code>
attribute on the rule element. This will override the previous
value and change the message the rule will print on the report.</p>
<p>Similarly, the <strong>priority</strong> of a rule can be changed via a nested
element. Using priority, you can deactivate some rules based on a
minimum priority threshold (set using the <code class="language-plaintext highlighter-rouge">--minimum-priority</code> CLI option).
Priority in the ruleset is an integer ranging from 1 to 5, with 1 being the highest
priority. On the command line, you can either use the integer or the following values:</p>
<table>
<thead>
<tr>
<th>Priority</th>
<th>minimum-priority value</th>
</tr>
</thead>
<tbody>
<tr>
<td>1</td>
<td>High</td>
</tr>
<tr>
<td>2</td>
<td>Medium_High</td>
</tr>
<tr>
<td>3</td>
<td>Medium</td>
</tr>
<tr>
<td>4</td>
<td>Medium_Low</td>
</tr>
<tr>
<td>5</td>
<td>Low</td>
</tr>
</tbody>
</table>
<p>Putting things together, the following rule reference lowers the priority
of EmptyCatchBlock to 5 (“Low”), such that e.g. using the <code class="language-plaintext highlighter-rouge">--minimum-priority=Medium_Low</code> CLI parameters
will cause the rule to be ignored.</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/errorprone.xml/EmptyCatchBlock"</span>
<span class="na">message=</span><span class="s">"Empty catch blocks should be avoided"</span> <span class="nt">&gt;</span>
<span class="nt">&lt;priority&gt;</span>5<span class="nt">&lt;/priority&gt;</span>
<span class="nt">&lt;/rule&gt;</span>
</code></pre></div></div>
<h2 id="rule-properties">Rule properties</h2>
<p>Properties make it easy to customise the behaviour of a rule directly from the xml. They come in several types,
which correspond to the type of their values. For example, NPathComplexity declares a property “reportLevel”,
with an integer value type, and which corresponds to the threshold above which a method will be reported.
If you believe that its default value of 200 is too high, you could lower it to e.g. 150 in the following way:</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/design.xml/NPathComplexity"</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">"reportLevel"</span><span class="nt">&gt;</span>
<span class="nt">&lt;value&gt;</span>150<span class="nt">&lt;/value&gt;</span>
<span class="nt">&lt;/property&gt;</span>
<span class="nt">&lt;/properties&gt;</span>
<span class="nt">&lt;/rule&gt;</span>
</code></pre></div></div>
<p>Properties are assigned a value with a <code class="language-plaintext highlighter-rouge">property</code> element, which should mention the name of a property as an
attribute. The value of the property can be specified either in the content of the element, like above, or
in the <code class="language-plaintext highlighter-rouge">value</code> attribute, e.g.</p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"reportLevel"</span> <span class="na">value=</span><span class="s">"150"</span><span class="nt">/&gt;</span>
</code></pre></div></div>
<p>All property assignments must be enclosed in a <code class="language-plaintext highlighter-rouge">properties</code> element, which is itself inside a <code class="language-plaintext highlighter-rouge">rule</code> element.</p>
<div class="alert alert-success" role="alert"><i class="fas fa-check-square-o"></i> <b>Tip:</b>
The properties of a rule are documented with the rule, e.g. <a href="pmd_rules_java_design.html#npathcomplexity">here</a>
for NPathComplexity. Note that <strong>assigning a value to a property that does not exist throws an error!</strong>
</div>
<p>Some properties take multiple values (a list), in which case you can provide them all by delimiting them with
a comma (,), e.g.</p>
<div class="language-xml highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nt">&lt;property</span> <span class="na">name=</span><span class="s">"legalCollectionTypes"</span>
<span class="na">value=</span><span class="s">"java.util.ArrayList,java.util.Vector,java.util.HashMap"</span><span class="nt">/&gt;</span>
</code></pre></div></div>
<p>These properties are referred to as <strong>multivalued properties</strong> in this documentation.</p>
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