If you're Java beginner, I'm with Jeroen. There is much else to learn first.
If you're an EJB beginner, look for "Mastering EJBs" online book. Don't know if it's the best, but it's free. You can buy a printed version if you like it.
A good question is never answered. It is not a bolt to be tightened into place but a seed to be planted and to bear more seed toward the hope of greening the landscape of the idea. John Ciardi