. In the "variable name" box, enter "CLASSPATH".
          In the "value" box, enter the correct path to the parser jar file 
          (/usr/webapps/yourapp/servlets/Xerces.jar in our example here).
          Press "OK", then apply the change and restart the application server.
        </p>
</div>
    
<a name="complex-usecases"></a>
<h2 class="underlined_10">Handling complex use cases</h2>
<div class="section">
<p>
        Sometimes the requirements for a servlet get quite sophisticated: SQL data sources,