Some applications could define in Web Descriptors files (web.xml) components that at the end the implementation class are not included in the package file (EAR/WAR).

If you are migrating to JBoss EAP Servlet it is not allowed and you will find errors in deployment time. It could be good to identify with a rule this incomplete definition.

For example if you define a servlet in web.xml without any implementation class:

<servlet id="Servlet_1">
<servlet­name>Servlet_Without_Class</servlet­name>
<servlet­class>com.not.implemented.ServletWithoutClass</servlet­class>
</servlet>