The big problem is that is probably not related to JBoss.
There error you get is about an Eclipse class? Are you deploying from Eclipse. It might be an Eclipse issue, or it might be a plain
Servlet issue, that would require this question to be in the Servlet foru,
I am going to move this first to the Servlet forum, and if they think it is more Eclipse oriented, then they will move it to that forum.
Thanks
Mark