glenn 01/02/25 19:47:38
Added: catalina/docs/config default.html
Log:
Implement DefaultContext in server.xml config
Revision Changes Path
1.1 jakarta-tomcat-4.0/catalina/docs/config/default.html
Index: default.html
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<title>The 'DefaultContext' Component</title>
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<h1>The <u>DefaultContext</u> Component</h1>
<br>
<a href="#Introduction">[Introduction]</a>
<a href="#Common Attributes">[Common Attributes]</a>
<a href="#Utility Components">[Utility Components]</a>
<a href="#Special Features">[Special Features]</a>
</br>
</div>
<a name="Introduction"></a>
<h2>Introduction</h2>
<p>A <strong>DefaultContext</strong> component represents a subset
of the <a href="context.html">Context</a> configuration elements.
A <code>DefaultContext</code> can be nested within an
<a href="engine.html">Engine</a> or <a href="host.html">Host</a>.</p>
<p>The elements you configure for a <code>DefaultContext</code> within
both the <code>Engine</code> and <code>Host</code> elements are
added to the configuration of any automatically created web application
context or configured context.</p>
<p>If you wish to configure a <code>Context</code> which does not use
the <code>DefaultContext</code> configuration set the <code>Context</code>
attribute <code>override="true"</code>.
<br>
<a name="Common Attributes"></a>
<h2>Common Attributes</h2>
<p>All implementations of the <strong>Context</strong> component support the
following attributes:</p>
<table border="1" width="100%">
<tr>
<th width="15%">Attribute</th>
<th width="85%">Description</th>
</tr>
<tr>
<td><code>cookies</code></td>
<td>
Set to <code>true</code> if you want cookies to be used for session
identifier communication (if supported by the client). Set to
<code>false</code> if you want to skip even trying session id cookies,
and rely only on URL rewriting. If not specified, the default value is
<code>true</code>.
</td>
</tr>
<tr>
<td><code>crossContext</code></td>
<td>
Set to <code>true</code> of you want calls from within this application
to <code>ServletContext.getContext()</code> to successfully return the
<code>ServletContext</code> for other web applications running in this
host. Set to <code>false</code> in security conscious environments, so
that <code>getContext()</code> calls will return <code>null</code>. The
default value is <code>false</code>.
</td>
</tr>
<tr>
<td><code>reloadable</code></td>
<td>
Set this attribute to <code>true</code> if you wish to have Catalina
check the classes in <code>WEB-INF/classes</code> and
<code>WEB-INF/lib</code> for modification, and automatically reload
this application if a change is detected. This feature is very useful
during development; however, it requires significant runtime overhead
so it is not recommended for production deployment scenarios.
</td>
</tr>
<tr>
<td><code>wrapperClass</code></td>
<td>
Java class name of the <code>org.apache.catalina.Wrapper</code>
implementation class that will be used for servlets managed by this
Context. If not specified, the standard value
(<code>org.apache.catalina.core.StandardWrapper</code>) will be used.
</td>
</tr>
<tr>
<td><code>useNaming</code></td>
<td>
Set this attribute to <code>true</code> if you wish to have Catalina
enable JNDI. Default is <code>true</code>.
</td>
</tr>
</table>
<br>
<a name="Utility Components"></a>
<h2>Utility Components</h2>
<p>You can attach one or more of the following utility components by nesting
a corresponding declaration inside your <strong>Host</strong> element.
</p>
<ul>
<li><a href="loader.html">Loader</a> - Configure a class loader associated
with this <strong>Context</strong>.
<li><a href="manager.html">Manager</a> - Configure a session manager
for the sessions associated with this <strong>Context</strong>.</li>
<li><a href="resources.html">Resources</a> - Configure access to the static
resources associated with this <strong>Context</strong></li>
</ul>
<br>
<a name="Special Features"></a>
<h2>Special Features</h2>
<h3>Lifecycle Listeners</h3>
<p>If you have implemented a Java object that needs to know when this
<strong>Context</strong> is started or stopped, you can declare it by nesting a
<code><Listener></code> element inside the <code><Context></code>
element. The class you specify in the <code>className</code> attribute
of this Listener must implement the
<code>org.apache.catalina.LifecycleListener</code> interface, and it will be
notified about the occurrence of the corresponding lifecycle events.</p>
<p>Configuration for such a listener might look like this:</p>
<pre>
<Context path="/myapp" ...>
...
<Listener className="com.mycompany.MyAppListener"/>
...
</Context>
</pre>
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