Funkcja

public String addToUser(Plyta plyta)
	{
		HttpSession session = (HttpSession) FacesContext.getCurrentInstance()
				.getExternalContext().getSession(true);
		String user = FacesContext.getCurrentInstance().getExternalContext().getRemoteUser();
		Katalog katalog = new Katalog();
		katalog.setUzytkownik(user);
		katalog.setPlyta(plyta);
		em.persist(katalog);
		return PAGE_STAY_AT_THE_SAME;
	}