private void fillDbTables() throws Exception {
    for (Category cat : categories) categoryDAO.create(cat);

    for (Producer p : producers) producerDAO.create(p);

    Long idProducer = producerDAO.getByName("Apple").getId();
    Long idCategory = categoryDAO.getByName("Tablet").getId();

    commodity.setIdProducer(idProducer);
    commodity.setIdCategory(idCategory);
    commodityDAO.create(commodity);
    commodity = commodityDAO.getByName("Ipad4");

    commodityView.setIdCommodity(commodity.getId());
  }