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Tomcat example source code file (loader.xml)
This example Tomcat source code file (loader.xml) is included in the DevDaily.com
"Java Source Code
Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.
The Tomcat loader.xml source code
<?xml version="1.0"?>
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The ASF licenses this file to You under the Apache License, Version 2.0
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limitations under the License.
-->
<!DOCTYPE document [
<!ENTITY project SYSTEM "project.xml">
]>
<document url="loader.html">
&project;
<properties>
<author email="craigmcc@apache.org">Craig R. McClanahan
<title>The Loader Component
</properties>
<body>
<section name="Introduction">
<p>The Loader element represents the web
application class loader</em> that will be used to load Java
classes and resources for your web application. Such
a class loader must follow the requirements of the Servlet
Specification, and load classes from the following locations:</p>
<ul>
<li>From the /WEB-INF/classes directory inside your
web application.</li>
<li>From JAR files in the /WEB-INF/lib directory
inside your web application.</li>
<li>From resources made available by Catalina to all web
applications globally.</li>
</ul>
<p>A Loader element MAY be nested inside a Context
component. If it is not included, a default Loader configuration will be
created automatically, which is sufficient for most requirements.</p>
<p>For a more in-depth description of the class loader hierarchy
that is implemented by Catalina, see <a href="../class-loader-howto.html">the ClassLoader HowTo.
<blockquote>
<p>The description below uses the variable name $CATALINA_HOME
to refer to the directory into which you have installed Tomcat 6,
and is the base directory against which most relative paths are
resolved. However, if you have configured Tomcat 6 for multiple
instances by setting a CATALINA_BASE directory, you should use
$CATALINA_BASE instead of $CATALINA_HOME for each of these
references.</p>
</em>
</section>
<section name="Attributes">
<subsection name="Common Attributes">
<p>All implementations of Loader
support the following attributes:</p>
<attributes>
<attribute name="className" required="false">
<p>Java class name of the implementation to use. This class must
implement the <code>org.apache.catalina.Loader interface.
If not specified, the standard value (defined below) will be used.</p>
</attribute>
<attribute name="delegate" required="false">
<p>Set to true if you want the class loader to follow
the standard Java2 delegation model, and attempt to load classes from
parent class loaders <strong>before looking inside the web
application. Set to <code>false (the default) to have the
class loader look inside the web application first, before asking
parent class loaders to find requested classes or resources.</p>
</attribute>
<attribute name="reloadable" required="false">
<p>Set to true if you want Catalina to monitor classes in
<code>/WEB-INF/classes/ and /WEB-INF/lib for
changes, and automatically reload the web application if a change
is detected. This feature is very useful during application
development, but it requires significant runtime overhead and is
not recommended for use on deployed production applications. You
can use the <a href="../manager-howto.html">Manager web
application, however, to trigger reloads of deployed applications
on demand.</p>
<p>NOTE - The value for this property will be
inherited from the <code>reloadable attribute you set on
the surrounding <a href="context.html">Context component,
and any value you explicitly set here will be replaced.</p>
</attribute>
</attributes>
</subsection>
<subsection name="Standard Implementation">
<p>The standard implementation of Loader is
<strong>org.apache.catalina.loader.WebappLoader.
It supports the following additional attributes (in addition to the
common attributes listed above):</p>
<attributes>
<attribute name="loaderClass" required="false">
<p>Java class name of the java.lang.ClassLoader
implementation class to use. If not specified, the default value is
<code>org.apache.catalina.loader.WebappClassLoader.
</attribute>
</attributes>
</subsection>
</section>
<section name="Nested Components">
<p>No components may be nested inside a Loader element.
</section>
<section name="Special Features">
<subsection name="Logging">
<p>A loader is associated with the log category based on its classname.
</subsection>
</section>
</body>
</document>
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