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.
Valerio, Pardon me if I am stating the obvious, but first of all, in order to lookup an EJB from a servlet, both the EJB and servlet usually need to be in the same EAR, i.e. same JEE application. Also, it looks like you are using the EJB's local interface, in which case I believe your lookup string is wrong. I don't recall the correct format, but I believe it is detailed in the OC4J documentation, which is available from: