Java Programming

I am currently trying to review possible GUI Builder tools for Java-based web development. A GUI Builder that would work for web pages with JSP code, and/or web pages using JSF. Does anyone have any suggestions? I am not interested in GUI Builders for Swing or SWT (which is what most of my searching keeps turning up).

Personally, I don't like to use GUI Builders for web pages, because it can lead to some really messy code with distressingly invalid HTML. But this isn't for me. I'm looking for something people with more of a business background can potentially use to update the look of some web pages. The view technology (JSP, JSF, or something else) is not yet set, other than that it will be Java-based.

Thank you for any suggestions.