 may be changed while the
        web application is running (e.g. via JMX). When the cache is disabled
        any resources currently in the cache are cleared from the cache.</p>
      </td></tr><tr><td><code class="attributeName">className</code></td><td>
        <p>Java class name of the implementation to use. This class must
        implement the <code>org.apache.catalina.WebResourceRoot</code>
        interface. If not specified, the standard value (defined below) will be
        used.</p>
      </td>