This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Is there a particular reason you want to set the VO in the response? This is somewhat counter to S2's philosophy--in general S2 espouses creating an action property to expose data to the view layer and avoid any coupling to the servlet spec.