This week's giveaway is in the EJB and other Java EE Technologies forum. We're giving away four copies of EJB 3 in Action and have Debu Panda, Reza Rahman, Ryan Cuprak, and Michael Remijan on-line! See this thread for details.
In your action declaration, just include an additional result element of type "input". In the action code, if you notice validation errors on the input values, just return Action.INPUT ("input") and the framework will forward to the input page.