Re: GWT RPC 404 Error

Changing url-pattern in your web.xml should work (<url-pattern>/
register/registermodule</url-pattern>):
Actually this is the remote servlet URL which gets looked up by GWT
client code while accessing the remote service.

<web-app>

<!-- Servlets -->
<servlet>
<servlet-name>RegisterModule</servlet-name>
<servlet-class>modules.register.server.Register</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>RegisterModule</servlet-name>
<url-pattern>/register/registermodule</url-pattern>
</servlet-mapping>

<!-- Default page to serve -->
<welcome-file-list>
<welcome-file>Fnk.html</welcome-file>
</welcome-file-list>

</web-app>