How to inject EntityManager in EntityListeners

Question

I need to inject EntityManager in EntityListener class so that I can perform CRUD operation on it.

POJO:

@Entity
@EntityListner(AuditLogging.class)
c         


        

Answer 1

Anyways, I got this done by getting entityManager reference from EntityManagerFactory bean which is configured in my jdbc-config.xml. But again this is not what I wanted. I wanted to work around with @PersistenceContext.

  @Autowired
  EntityManagerFactory entityManagerFactory;

  private static EntityManager entityManager;

  public void setEntityManagerFactory(EntityManagerFactory entityManagerFactory) {
    entityManager=entityManagerFactory.createEntityManager();
    this.entityManagerFactory = entityManagerFactory;
  }

Here are few notes that we need to keep in mind:

1. We can't inject an EntityManager into an EntityListener (through @PersistenceContext). EntityListener is not managed by any of the containers
2. @PersistenceContext class cannot be static. So we cant attain the instance while class loading.
3. EntityListeners are instantiated by JPA, so Spring does not have an opportunity to inject EntityManager