This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
You'd have to have at least one Struts tag: an <html:errors> or <html:messages> tag to show any errors that might be caught by the validator. You could probably get by with using regular HTML input tags instead of html:text tags as long as you used name attributes that matched your ActionForm properties.
I must say, though, that I just don't get picking Struts as a framework and then choosing not to use some of its most important features. It's a little like walking into a restaurant and saying "I'll have a hamburger, but hold the meat and hold the bun".