public void initData() {
// Revision 1
EntityManager em = getEntityManager();
em.getTransaction().begin();
ComponentSetTestEntity cte1 = new ComponentSetTestEntity();
em.persist(cte1);
em.getTransaction().commit();
// Revision 2
em = getEntityManager();
em.getTransaction().begin();
cte1 = em.find(ComponentSetTestEntity.class, cte1.getId());
cte1.getComps().add(new Component1("a", "b"));
em.getTransaction().commit();
id1 = cte1.getId();
}