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.
The request parameter name and values represent key-value pairs and hence I would imagine that it would be stored as a Map in the request object. And being a Map, there is no order guaranteed. Neither should it be of any consequence.