"web.xml" validation error while upgrading from EAP 4.X to EAP 5.x

Issue

• In the process of migrating our application from JBoss 4.X to JBoss 5, we ran into below error when trying to deploy our applications which contains the following kind of "web.xml":

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
    <servlet>
        <servlet-name>SomeInitializer</servlet-name>
        <display-name>Some Initializer Servlet</display-name>
        <servlet-class>com.some.SomeInitializerServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
</web-app>

• In this case the below kind of error can be found while deploying the application:

Deployment "vfszip://home/userone/jboss-eap-5.1/jboss-as//server/default/deploy/fmis.ear/" is in error due to the following reason(s):  
 org.xml.sax.SAXException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'display-name'.  
 One of '{"http://java.sun.com/xml/ns/j2ee":servlet-class, "http://java.sun.com/xml/ns/j2ee":jsp-file}' is expected.  
 @ vfszip://home/userone/jboss-eap-5.1/jboss-as//server/default/deploy/TestApp.ear/TestApp.war/WEB-INF/web.xml[8,10]