@SessionScoped components cannot make use of non Serializable producer beans like EntityManager producers

Reported at Pete's request

public class Databases {
@Produces
@PersistenceContext(unitName = "users")
@Users
EntityManager userDatabaseEntityManager;
}

@Named
@SessionScoped
public class Identifier implements Serializable {
private boolean logged;
private User user = new User();
@Inject @Users private EntityManager usersEntityManager;