@Before
  public void prepareDb() throws Exception {
    getTransactionManager().begin();
    EntityManager em = getFactory().createEntityManager();

    husband = new Husband("frederic");
    husband.setName("Frederic Joliot-Curie");

    wife = new Wife("wife");
    wife.setName("Irene Joliot-Curie");
    wife.setHusband(husband);
    husband.setWife(wife);
    em.persist(husband);
    em.persist(wife);

    commitOrRollback(true);
    em.close();
  }