This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
You *can* write validation in your action, but it's a bit unwieldy in 1.1, IIRC (it's been awhile). If you're not doing *any* validation in the ActionForm/etc. then you should just be able to create an ActionErrors, add errors to it, and use saveErrors().