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<title>Checkstyle - Optional Checks</title>
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<h1>Optional Checks</h1>
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<strong>About</strong>
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<li> <a href="./index.html">Checkstyle</a>
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<strong>Documentation</strong>
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<li> <a href="./releasenotes.html">Release Notes</a>
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<li> <a href="./config.html">Configuration</a>
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<li> <a href="./availablechecks.html">Available Checks</a>
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<li> <a href="./checks.html">Standard Checks</a>
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<li> <a href="./config_javadoc.html"> Javadoc Comments</a>
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<li> <a href="./config_blocks.html"> Block Checks</a>
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<li><b> <a href="./optional.html">Optional Checks</a>
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<li><a href="#Overview"> Overview</a></li>
<li><a href="#Configuration"> Configuration</a></li>
<li> <a href="./config_j2ee.html"> J2EE Checks</a>
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<li> <a href="./extending.html">Extending Checkstyle</a>
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<a id="Overview"></a>
<h2>Overview</h2>
<p>
<a href="checks.html">Standard</a> Checkstyle Checks are
applicable to general Java coding style and require no external
libraries. An optional Check is for special applications or
requires additional libraries. There are are optional Checks
for:
</p>
<ul>
<li><a href="config_j2ee.html">J2EE Requirements</a></li>
</ul>
<a id="Configuration"></a>
<h2>Configuration</h2>
<p>
As with standard checks, optional checks are configured as
submodules of <a href="config.html#treewalker">TreeWalker</a>. The shortened name
of an optional Check module must include the appropriate package
name prefix. For example, this is a configuration fragment for
Check <span class="code">com.puppycrawl.tools.checkstyle.checks.j2ee.EntityBean</span>:
</p>
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<td bgcolor="#ffffff"><pre><module name="j2ee.EntityBean"/></pre></td>
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<p>
Consult the <a href="config.html#packagenames">Checkstyle
configuration manual</a> to learn how to integrate optional
Checks into the package configuration so that you can use fully
shortened names such as <span class="code">UnusedLocalVariable</span>.
</p>
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