@BeforeClass(dependsOnMethods = "init") public void initData() { EntityManager em = getEntityManager(); em.getTransaction().begin(); PropertyAccessTypeEntity pate = new PropertyAccessTypeEntity("data"); em.persist(pate); id1 = pate.getId(); em.getTransaction().commit(); em.getTransaction().begin(); pate = em.find(PropertyAccessTypeEntity.class, id1); pate.writeData("data2"); em.getTransaction().commit(); }