public static carrental.model.jpa.entities.Customer convertCustomerToEntity( Customer customer, EntityManager manager) { carrental.model.jpa.entities.Customer entity = new carrental.model.jpa.entities.Customer(); entity.setId(customer.getId()); entity.setFirstName(customer.getFirstName()); entity.setLastName(customer.getLastName()); entity.setIdCode(customer.getIdCode()); entity.setRegisterDate(customer.getRegisterDate().getTime()); if (manager != null) manager.merge(entity); return entity; }