private void createReaderData() {
EntityManager em = emf.createEntityManager();
em.getTransaction().begin();
em.persist(new Reader("Anton", "Bernolak", "10.4.1875", "Bernolakovo 453, SR",
"anton.bernolak@gmail.com", "0903 560 987", "aaa"));
em.persist(new Reader("Martin", "Skrecok", "5.10.1990", "Jurkovicova 16, SR",
"martin.skrecok@gmail.com", "903 875 349", "bbb"));
em.persist(new Reader("Leon", "Powe", "20.5.1950", "Golden Street, Boston, USA",
"leon.powe@gmail.com", "740 320 853", "ccc"));
em.getTransaction().commit();
if (em != null) {
em.close();