No problem :)
Try to use:
@Stateless
@LocalBinding(jndiBinding = "myProject/OperazioniUtenti/local")
public class OperazioniUtentiBean implements OperazioniUtenti
then you'll be able to write in your servlet:
lookup("myProject/OperazioniUtenti/local")
For remote:
@Remote
@Stateless
@RemoteBinding(jndiBinding = "myProject/OperazioniUtenti/remote")
public class OperazioniUtentiBean implements OperazioniUtenti
Remember to use @Remote while using @RemoteBinding.
Good idea (in my opinion) is to create two separated jars:
1. BookShop.jar or BookShopImpl.jar to keep Beans' implementations (EJB)
2. BookShopApi.jar to keep only interfaces
After that you can safely put BookShopApi to WEB-INF/lib dir or include to other client's application.