No transactional entitymanager available in @PostConstruct

Question

Problem: entityManager.unwrap(SessionImplementor.class) cause no transactional entitymanager available exception.

Code

Answer 1

According to this excelent answer:

In the @PostConstruct (as with the afterPropertiesSet from the InitializingBean interface) there is no way to ensure that all the post processing is already done, so (indeed) there can be no Transactions.

As I see, you do not need a transaction nor an entity manager bean, but rather an entity manager factory bean. I think you should simply autowire the EntityManagerFactory and then unwrap the Hibernate SessionFactory from it.

@Autowired
private EntityManagerFactory entityManagerFactory;

@PostConstruct
public void registerListeners() {
    SessionFactory sessionFactory = entityManagerFactory.unwrap(SessionFactory.class);
    ...
}