That's a lot of information. We ask that you Isolate the Problem first, as few people are going to dig through a 1200-line server config file that is probably not even relevant to the discussion.
Your error message says:
If you tried to load a JSP in your browser, the answer is simple: you can't do that. You have to invoke a Struts action. If you did invoke a Struts action, you probably have a dependency that is unresolved, so you'd have to look in the server log file for the full exception trace.