This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
No, because those are what is called Projection Queries, so in that case, then there would be no way to determine what type of object to create. In EJBs for Entity beans, it has to bring back all the fields of the entity beans populated. Now in EJB 3.0 and JPA, you can create project querires that create other types of objects that aren't entity beans.