This is not a programming question but is only relevant to programmers, so I think it is appropriate.
How do you go about debugging a program a servlet in Eclipse. Can I somehow use my JSP's to create "simulated" request objects and have the servlets try to handle them, from Eclipse with our without some plugin. This would be ideal if I could then step through the code and see where I am getting my errors.
Install the Eclipse Web Tools Platform.
And even without WTP the normal Eclipse Java debugger can attach to a remote process, so you can debug (set breakpoints and step through) your regular servlet container.
You can create mock HttpServletRequest and HttpServletResponse objects. It should be possible for you to execute a servlet's main method from a unit test the like, which can then be attached to Eclipse's normal debugger.