Did you deploy the .ear file ?
Ok, just to let you know that I recently follow the tutorial like you with the 1.4.1 version and everything went smoothly and ran perfectly.
I suggest that you look into the deploy folder of JBoss to see if FiboApp.ear is there.
There was a bug in my web.xml file but I corrected that.
Then I got a ClassCastException when the servlet tried to invoke the home interface.
I found documention in another forum that said to remove the web-inf/classes prefix from the packaging configuration for web classes.
This fixed the problem BUT i have no idea why it fixed the problem. It has fixed the problem in other projects too.
Any idea why NOT putting the servlet class in the WEB-INF/classes fixes the problem? Isn't this the j2ee spec?