I have a large web application built using Java Servlets. I'm interested in migrating it to a MVC model, adding in JSPs. I'm running Tomcat, and I've had no problems getting the display bits of a few test servlets into JSP.

There are a few dozen forms and web-based XML file editors in here. Different editors re-use bits of functionality from a common source, currently, and I don't want to break that. What technologies do I want to look at? Beans? EJB? JAF? Struts?

Suggestions, anyone?