This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
I presume you are talking about the Seam book? If your existing EJBs are EJB3 beans, then yes, it will help you reuse those service objects. The book does not specifically address EJB2 beans, but you can easily obtain those objects via JNDI.