"kalyan", You've already been warned twice about your name. Your name does not fit the Naming Policy. Read it carefully, and please change your name accordingly. You need both first and last names set. And Obviously fictitious names may be locked out, especially after three warnings. Thank you.
The concepts (for Session Beand and MDB) still hold good from the Head First EJB book. But I'd suggest you better pick up the O'Reilly's EJB book or the Manning's book (EJB 3 in Action) and the Apress book (Pro EJB3 - has a good deal on Entity Beans) for the SCBCD 5. [ February 19, 2008: Message edited by: Jothi Shankar Kumar Sankararaj ]