Same error with this code:

emf =
Persistence.createEntityManagerFactory("person",System.getProperties());
                        EntityManager em = emf.createEntityManager();

                        em.getTransaction().begin();
                        Person p1 = new Person();
                        p1.setIdPerson(1);
                        p1.setMail("mail1");
                        p1.setName("p1");
                        em.persist(p1);
                        em.getTransaction().commit();

                        Person fx = em.find(Person.class, 1);
                        em.getTransaction().begin();
                        if (fx!=null){
                                fx.setMail("ea");
                                em.merge(p1);
                        }

                        em.getTransaction().commit();
                        em.close();
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