This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
As per my knoweldge , there is no single book to understand whole j2ee technologies. For EJB, Servlets&JSP I sincerely recommend Head First series. They teach you, guide you to understand and implement the technologies.
Happy reading Shiv
Shivu<br />(SCJP1.4,SCBCD(In Progress..)<br />We are what we think.