Jpa ViewerSupport.bind不能正确处理实体

在我的RCP应用程序中，我有一个绑定到可写人员列表的TableViewer：

input = new WritableList(ModelProvider.INSTANCE.getPersons(), Person.class);
ViewerSupport.bind(viewer, input, BeanProperties.values(new String[] { "firstName", "lastName", "married" }));

如果我在getPersons中创建persons，那么在我的tableviewer中一切都很好。我可以修改一个条目，修改后，新值将在表中标记。 getPersons：

persons = new ArrayList<Person>();
persons.add(new Person("Rainer", "Zufall", "male", true));
persons.add(new Person("Reiner", "Babbel", "male", true));
persons.add(new Person("Marie", "Dortmund", "female", false));
return persons;

factory = persistenceProvider.createEntityManagerFactory(PERSISTENCE_UNIT_NAME,map);
entityManager = factory.createEntityManager();
Query q = entityManager.createQuery("select p from Person p");
List<Person> persons = q.getResultList();
entityManager.close();
return persons;

但是，如果persons将从EntityManager返回，则修改的条目将不会在表中标记，尽管Person对象中的字段将被设置。 getPersons：

persons = new ArrayList<Person>();
persons.add(new Person("Rainer", "Zufall", "male", true));
persons.add(new Person("Reiner", "Babbel", "male", true));
persons.add(new Person("Marie", "Dortmund", "female", false));
return persons;

factory = persistenceProvider.createEntityManagerFactory(PERSISTENCE_UNIT_NAME,map);
entityManager = factory.createEntityManager();
Query q = entityManager.createQuery("select p from Person p");
List<Person> persons = q.getResultList();
entityManager.close();
return persons;