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<div class="subTitle">org.apache.commons.logging.impl</div>
<h2 title="Class ServletContextCleaner" class="title">Class ServletContextCleaner</h2>
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<li>java.lang.Object</li>
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<li>org.apache.commons.logging.impl.ServletContextCleaner</li>
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<dd>java.util.EventListener, javax.servlet.ServletContextListener</dd>
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<pre>public class <span class="strong">ServletContextCleaner</span>
extends java.lang.Object
implements javax.servlet.ServletContextListener</pre>
<div class="block">This class is capable of receiving notifications about the undeployment of
a webapp, and responds by ensuring that commons-logging releases all
memory associated with the undeployed webapp.
<p>
In general, the WeakHashtable support added in commons-logging release 1.1
ensures that logging classes do not hold references that prevent an
undeployed webapp's memory from being garbage-collected even when multiple
copies of commons-logging are deployed via multiple classloaders (a
situation that earlier versions had problems with). However there are
some rare cases where the WeakHashtable approach does not work; in these
situations specifying this class as a listener for the web application will
ensure that all references held by commons-logging are fully released.
<p>
To use this class, configure the webapp deployment descriptor to call
this class on webapp undeploy; the contextDestroyed method will tell
every accessible LogFactory class that the entry in its map for the
current webapp's context classloader should be cleared.</div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.1</dd>
<dt><span class="strong">Version:</span></dt>
<dd>$Id: ServletContextCleaner.java 1432580 2013-01-13 10:41:05Z tn $</dd></dl>
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<td class="colFirst"><code>private static java.lang.Class[]</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/ServletContextCleaner.html#RELEASE_SIGNATURE">RELEASE_SIGNATURE</a></strong></code> </td>
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<td class="colOne"><code><strong><a href="../../../../../org/apache/commons/logging/impl/ServletContextCleaner.html#ServletContextCleaner()">ServletContextCleaner</a></strong>()</code> </td>
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<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/ServletContextCleaner.html#contextDestroyed(javax.servlet.ServletContextEvent)">contextDestroyed</a></strong>(javax.servlet.ServletContextEvent sce)</code>
<div class="block">Invoked when a webapp is undeployed, this tells the LogFactory
class to release any logging information related to the current
contextClassloader.</div>
</td>
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<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/commons/logging/impl/ServletContextCleaner.html#contextInitialized(javax.servlet.ServletContextEvent)">contextInitialized</a></strong>(javax.servlet.ServletContextEvent sce)</code>
<div class="block">Invoked when a webapp is deployed.</div>
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<pre>private static final java.lang.Class[] RELEASE_SIGNATURE</pre>
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<pre>public ServletContextCleaner()</pre>
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<pre>public void contextDestroyed(javax.servlet.ServletContextEvent sce)</pre>
<div class="block">Invoked when a webapp is undeployed, this tells the LogFactory
class to release any logging information related to the current
contextClassloader.</div>
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<dt><strong>Specified by:</strong></dt>
<dd><code>contextDestroyed</code> in interface <code>javax.servlet.ServletContextListener</code></dd>
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<pre>public void contextInitialized(javax.servlet.ServletContextEvent sce)</pre>
<div class="block">Invoked when a webapp is deployed. Nothing needs to be done here.</div>
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<dt><strong>Specified by:</strong></dt>
<dd><code>contextInitialized</code> in interface <code>javax.servlet.ServletContextListener</code></dd>
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