104 lines
8.1 KiB
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104 lines
8.1 KiB
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<html><head><META http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><title>Apache Tomcat Configuration Reference - The Loader Component</title><meta name="author" value="Craig R. McClanahan"><meta name="email" value="craigmcc@apache.org"></head><body bgcolor="#ffffff" text="#000000" link="#525D76" alink="#525D76" vlink="#525D76"><table border="0" width="100%" cellspacing="0"><!--PAGE HEADER--><tr><td><!--PROJECT LOGO--><a href="http://tomcat.apache.org/"><img src="../../images/tomcat.gif" align="right" alt="
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The Apache Tomcat Servlet/JSP Container
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" border="0"></a></td><td><font face="arial,helvetica,sanserif"><h1>Apache Tomcat 6.0</h1></font></td><td><!--APACHE LOGO--><a href="http://www.apache.org/"><img src="../../images/asf-logo.gif" align="right" alt="Apache Logo" border="0"></a></td></tr></table><table border="0" width="100%" cellspacing="4"><!--HEADER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><tr><!--RIGHT SIDE MAIN BODY--><td width="80%" valign="top" align="left"><table border="0" width="100%" cellspacing="4"><tr><td align="left" valign="top"><h1>Apache Tomcat Configuration Reference</h1><h2>The Loader Component</h2></td><td align="right" valign="top" nowrap="true"><img src="../../images/void.gif" width="1" height="1" vspace="0" hspace="0" border="0"></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Introduction"><strong>Introduction</strong></a></font></td></tr><tr><td><blockquote>
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<p>The <strong>Loader</strong> element represents the <em>web
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application class loader</em> that will be used to load Java
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classes and resources for your web application. Such
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a class loader must follow the requirements of the Servlet
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Specification, and load classes from the following locations:</p>
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<ul>
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<li>From the <code>/WEB-INF/classes</code> directory inside your
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web application.</li>
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<li>From JAR files in the <code>/WEB-INF/lib</code> directory
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inside your web application.</li>
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<li>From resources made available by Catalina to all web
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applications globally.</li>
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</ul>
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<p>A Loader element MAY be nested inside a <a href="context.html">Context</a>
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component. If it is not included, a default Loader configuration will be
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created automatically, which is sufficient for most requirements.</p>
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<p>For a more in-depth description of the class loader hierarchy
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that is implemented by Catalina, see <a href="../../class-loader-howto.html">the ClassLoader HowTo</a>.</p>
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<blockquote><em>
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<p>The description below uses the variable name $CATALINA_HOME
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to refer to the directory into which you have installed Tomcat 6,
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and is the base directory against which most relative paths are
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resolved. However, if you have configured Tomcat 6 for multiple
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instances by setting a CATALINA_BASE directory, you should use
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$CATALINA_BASE instead of $CATALINA_HOME for each of these
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references.</p>
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</em></blockquote>
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</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Attributes"><strong>Attributes</strong></a></font></td></tr><tr><td><blockquote>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Common Attributes"><strong>Common Attributes</strong></a></font></td></tr><tr><td><blockquote>
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<p>All implementations of <strong>Loader</strong>
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support the following attributes:</p>
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<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code>className</code></td><td align="left" valign="center">
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<p>Java class name of the implementation to use. This class must
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implement the <code>org.apache.catalina.Loader</code> interface.
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If not specified, the standard value (defined below) will be used.</p>
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</td></tr><tr><td align="left" valign="center"><code>delegate</code></td><td align="left" valign="center">
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<p>Set to <code>true</code> if you want the class loader to follow
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the standard Java2 delegation model, and attempt to load classes from
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parent class loaders <strong>before</strong> looking inside the web
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application. Set to <code>false</code> (the default) to have the
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class loader look inside the web application first, before asking
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parent class loaders to find requested classes or resources.</p>
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</td></tr><tr><td align="left" valign="center"><code>reloadable</code></td><td align="left" valign="center">
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<p>Set to <code>true</code> if you want Catalina to monitor classes in
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<code>/WEB-INF/classes/</code> and <code>/WEB-INF/lib</code> for
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changes, and automatically reload the web application if a change
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is detected. This feature is very useful during application
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development, but it requires significant runtime overhead and is
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not recommended for use on deployed production applications. You
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can use the <a href="../../manager-howto.html">Manager</a> web
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application, however, to trigger reloads of deployed applications
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on demand.</p>
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<p><strong>NOTE</strong> - The value for this property will be
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inherited from the <code>reloadable</code> attribute you set on
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the surrounding <a href="context.html">Context</a> component,
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and any value you explicitly set here will be replaced.</p>
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</td></tr></table>
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</blockquote></td></tr></table>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Standard Implementation"><strong>Standard Implementation</strong></a></font></td></tr><tr><td><blockquote>
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<p>The standard implementation of <strong>Loader</strong> is
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<strong>org.apache.catalina.loader.WebappLoader</strong>.
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It supports the following additional attributes (in addition to the
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common attributes listed above):</p>
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<table border="1" cellpadding="5"><tr><th width="15%" bgcolor="#023264"><font color="#ffffff">Attribute</font></th><th width="85%" bgcolor="#023264"><font color="#ffffff">Description</font></th></tr><tr><td align="left" valign="center"><code>loaderClass</code></td><td align="left" valign="center">
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<p>Java class name of the <code>java.lang.ClassLoader</code>
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implementation class to use. If not specified, the default value is
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<code>org.apache.catalina.loader.WebappClassLoader</code>.</p>
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</td></tr></table>
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</blockquote></td></tr></table>
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</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Nested Components"><strong>Nested Components</strong></a></font></td></tr><tr><td><blockquote>
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<p>No components may be nested inside a <strong>Loader</strong> element.</p>
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</blockquote></td></tr></table><table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#525D76"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Special Features"><strong>Special Features</strong></a></font></td></tr><tr><td><blockquote>
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<table border="0" cellspacing="0" cellpadding="2"><tr><td bgcolor="#828DA6"><font color="#ffffff" face="arial,helvetica.sanserif"><a name="Logging"><strong>Logging</strong></a></font></td></tr><tr><td><blockquote>
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<p>A loader is associated with the log category based on its classname.</p>
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</blockquote></td></tr></table>
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</blockquote></td></tr></table></td></tr><!--FOOTER SEPARATOR--><tr><td colspan="2"><hr noshade="noshade" size="1"></td></tr><!--PAGE FOOTER--><tr><td colspan="2"><div align="center"><font color="#525D76" size="-1"><em>
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Copyright © 1999-2006, Apache Software Foundation
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</em></font></div></td></tr></table></body></html>
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