private Stat getExpediceData(Vykladka vykladka, Date datum)
         queryString = "select datum, ks from vykaz v join expedice e on v.idexpedice=e.idexpedice where e.datum = ? and v.idvykladka=?";
        Query q = em.createNativeQuery(queryString, Stat.class);
        q.setParameter(1, datum, TemporalType.DATE);
        q.setParameter(2, vykladka.getIdvykladka());
        Stat stat = (Stat) q.getSingleResult();
        return stat;

@Entity
public class Stat implements Serializable {
    @Id
    @Temporal(TemporalType.DATE)
    @Column(name = "datum")
    private Date datum;
    @Column(name = "ks")
    private Integer ks;
    @Column(name = "remitenda")
    private Integer remitenda;
    @Column(name = "cas_zavozu")
    private String casZavozu;

    getters and setters
    }

private Stat getExpediceData(Vykladka vykladka, Date datum) {
        String queryString = "select datum, ks from vykaz v join expedice e on v.idexpedice=e.idexpedice where e.datum = ? and v.idvykladka=?";
        Query q = em.createNativeQuery(queryString);
        q.setParameter(1, datum, TemporalType.DATE);
        q.setParameter(2, vykladka.getIdvykladka());

        List<Object[]> result = q.getResultList();
        for (Object[] o : result){
            System.out.println(o[0]);
            System.out.println(o[1]);
        }