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.
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.