Is OperazioniUtenti an EJB component ?
If so, then u have to deploy it as EJB project.
As fare as I know, when u put it in WEB-INF/lib direcory the EJB Container doesn't deploy it.
Could you show me the source code of OperazioniUtenti (just declaration and annotations)
@RemoteBinding - define your own JNDI name to component (e.g. EJB, MBean)