removeTownsEx13()

    private void removeTownsEx13() throws IOException {
        System.out.println("Addresses in Sofia will be more if you don't clean DB before");
        System.out.println("Type a town name:");
        String townName = reader.readLine();
        entityManager.getTransaction().begin();
        Town townDelete = this.entityManager.createQuery("SELECT t  FROM Town t "
                + "WHERE t.name = :town", Town.class)
                .setParameter("town", townName)
                .getSingleResult();

        List<Address> addressesToDelete = this.entityManager
                .createQuery("SELECT a FROM Address a WHERE a.town.id= :id", Address.class)
                .setParameter("id", townDelete.getId())
                .getResultList();

        addressesToDelete
                .forEach(t -> t.getEmployees()
                        .forEach(em -> em.setAddress(null)));

        addressesToDelete.forEach(this.entityManager::remove);
        this.entityManager.remove(townDelete);
        entityManager.getTransaction().commit();
        int countDeletedAddresses = addressesToDelete.size();
        System.out.printf("%d address%s in %s deleted",
                countDeletedAddresses,
                countDeletedAddresses == 1 ? "" : "es",
                townName);
    }