c'è dichiarata nel file web.xml che è il seguente:
<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>
<servlet>
<servlet-name>servlet</servlet-name>
<servlet-class>servlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>servlet</servlet-name>
<url-pattern>/servlet/servlet</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>
index.jsp
</welcome-file>
<welcome-file>
index.html
</welcome-file>
<welcome-file>
index.htm
</welcome-file>
</welcome-file-list>
<taglib>
<taglib-uri>/tags</taglib-uri>
<taglib-location>/WEB-INF/tlds/tags.tld</taglib-location>
</taglib>
</web-app>


non penso sia questo il problema.. scusami cmq il disturbo..
Marika