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<h1 id="installation">5.2 Installation</h1>
<h2 id="Containers">Installing Struts with your servlet container</h2>
<div class="indent">
<h4 id="wls5">Weblogic 5.1 (service pack 8)</h4>
<ul>
<li>Obtain and install the Xerces XML parser (problems have been reported with
the Sun reference implementation). Put xerces.jar in your WebLogic system
path.</li>
<li>Obtain and unpack the Struts binary distribution (this procedure assumes
it was extracted to <code>c:\jakarta-struts</code>).</li>
<li>Add an entry to weblogic.properties for each of the Struts web applications
that you would like to configure. For example, to make the struts-example
application available, add the following line to weblogic.properties:<br />
<code>weblogic.httpd.webApp.strutsexample=<br />
c:/jakarta-struts/webapps/struts-example.war</code>
</li>
<li>You do not need to include struts.jar or any of the application specific
classes in the WebLogic classpath, since this will be done automatically (unless
deploying an unpacked web archive- see below).</li>
<li>Start WebLogic server and point your web browser to the struts application.
For example, to connect to the example application added in step 3:<br />
<code>http://localhost:7001/strutsexample</code>
</li>
<li>This example application depends on the Struts specific resource file ApplicationResources.properties
to be present on the classpath. However, WebLogic only extracts *.class files
from the archive so this file will not be found, resulting in an error the
first time it is needed- something similar to: javax.servlet.ServletException:
runtime failure in custom tag 'message'. Steps 6 & 7 will need to be performed
for this application, and any other that relies on ApplicationResources.properties.</li>
<li>Extract ApplicationResources.properties from the *.war file, and manually
copy it to the respective package in the _tmp_war_ directory WebLogic created
for this application. Again referring to the struts-example application, this
would be:<br />
<code>c:\jakarta-struts\webapps\WEB-INF\_tmp_war_strutsexample</code>
</li>
<li>Restart WebLogic. You will now be able to run the application:<br />
<code>http://localhost:7001/strutsexample</code>
</li>
</ul>
<p>The above steps should be followed for applications deployed as *.war files.
For unpacked web applications, configuration involves adding both <code>struts.jar</code>
and <code>/WEB-INF/classes</code> to the WebLogic classpath. For this reason,
I would suggest deploying applications as war files to WebLogic. However, the
same example application can be successfully deployed in extracted format by
modifying weblogic.properties (assuming the war was extracted to directory webapps/struts-example):</p>
<p>
<code>weblogic.httpd.webApp.strutsexample=<br />
c:/jakarta-struts/webapps/struts-example/</code>
</p>
<p>And starting WebLogic with the updated WebLogic classpath. For example:</p>
<p>
<code>c:\jdk1.3\bin\java -ms16m -mx64m<br />
-classpath c:\weblogic\lib\weblogic510sp8boot.jar;</code>
</p>
<hr />
<h4>Additional Recommendations</h4>
<ul>
<li>Servlet and JSP-Reloading should be turned off. First, you pay a performance
penalty. Depending on the number of JSPs, the number of requests and the
configured checking interval, the server will slow down. Second, with JSP- and
Servlet reloading, one opens the door for various Weblogic classloader problems,
that are difficult to diagnose, difficult to handle and often lead to lost
HTTP-sessions.</li>
<li>Set the name of the <code>sessionid</code> to <code>JSESSIONID</code>, if cookies are used for session
tracking and to jsessionid, if sessions are URL-based. (There are additional
problems related to URL-based sessions, caused from BEA's way to encode the session
id (J2EE-incompatible) as query-param. Especially <bean:include> will not work with
URL-based sessions yet. However, using the correct session name solves at least some
problems.)</li>
<li>Configure the JSP-Servlet registration in <code>weblogic.properties</code> for
maximum J2EE-compliance and/or for maximum performance.</li>
</ul>
<p>The JSP-Servlet supports some initialization parameters that can be customized to get
best performance, maximum compliance or (as shown below) easier debugging:</p>
<pre>
weblogic.httpd.initArgs.*.jsp=\
pageCheckSeconds=-1,\
setEmptyStrings=false,\
compileCommand=./_jspCompiler_.cmd,\
workingDir=/weblogic/myserver/tmp_classfiles,\
keepgenerated=true,\
debug=true,\
verbose=true
</pre>
<p>In the above example, the batch file (<code>_jspCompiler_.cmd</code>) invokes jikes
which results dramatically reduced startup times (jikes is about three times faster
than javac.) The batchfile contains only a single line:</p>
<pre>@jikes -g -nowarn %*</pre>
<p>The next configuration could be used when all tests have been done and speed is the
major concern ...</p>
<pre>
weblogic.httpd.initArgs.*.jsp=\
pageCheckSeconds=-1,\
setEmptyStrings=false,\
compileCommand=./_jspCompiler_.cmd,\
workingDir=/weblogic/myserver/tmp_classfiles,\
keepgenerated=false,\
debug=false,\
verbose=false
</pre>
<p>... together with ...</p>
<pre>@jikes -O -nowarn %*</pre>
<p>Weblogic supports similar settings through <code><context-params></code> in <code>web.xml</code>
(Please read the latest documentation at the BEA website for details.)</p>
<p>For additional issues, see also <a href="http://www.mail-archive.com/struts-dev@jakarta.apache.org/msg00284.html">More
fixes for WLS 5.1 SP8</a> from the Struts Developer mailing list</p>
<hr />
<ul>
<li>Author: Robert Hayden</li>
<li>Author: Wong Kok Kai</li>
<li>Author: Matthias Kerkhoff </li>
</ul>
<hr />
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