public void testRun() {
Issue167Parent p = new Issue167Parent(UUID.randomUUID().toString());
EntityManager em = emf.createEntityManager();
try {
p.getChildren().add(new Issue167Child("1"));
p.getChildren().add(new Issue167Child("2"));
p.getChildren().add(new Issue167Child("3"));
em.getTransaction().begin();
em.persist(p);
em.getTransaction().commit();