troubleshooting access to Servlet

We have a simple HelloServlet under our web site path, which we are unable to access (server sends 404-Not resource found error) The goal is to be able to access the servlet using URL [login to view URL] (the servlet will respond displaying a Hello header/text in the browser) Servelt needs to be mapped in the [login to view URL] file under expandimages/WEB-INF directory, so that it can be accessed as mentioned above (it is actually located at ...webapps/expandimages/WEB-INF/classes/expand/midlet/HelloServlet) Deliverables include specific instructions on how to apply changes made to set it up correctly, so that we can apply same change(s) shall we have the need to reboot the server in the future. Actually, after receiving the instructions, we will reboot the server, apply the change(s) ourselves and test it It is an easy job for someone with experience/knowledge of Apache/Tomcat Server System Admin. The OS is CentOS4 godaddy virtual dedicated server