Spring boot inject EntityManagerFactory in configuration class

Question

I\'m using spring boot and i want to integrate spring with hibernate. I want to make a Session Factory bean for further using. But I can\'t autowire EntityManagerFactory, I can\

Answer 1

I'm not exactly sure why you want to expose both beans because as @chrylis points out, you can easily unwrap the EMF into a SF where needed.

// Some spring component
@Component
public class MyFancyComponent {
  @PersistenceContext
  private EntityManager entityManager;

  public void doSomethingFancy() {
    // public SessionFactory API
    final SessionFactory sf = entityManager
         .unwrap( Session.class ).getFactory();

    // public SessionFactoryImplementor SPI
    final SessionFactoryImplementor sfi = entityManager
         .unwrap( SessionImplementor.class ).getFactory();
  }
}

Answer 2

When you say

But I can't autowire EntityManagerFactory

does it fail to compile or throw an exception at run-time? If the latter, what does the stack-trace say?

One possible solution/work around might be to inject an em into the configuration instead of the em factory, using the @PersistenceContext annotation:

@Configuration
@EnableTransactionManagement
public class DatabaseConfiguration {

    @PersistenceContext
    private EntityManager entityManager;

    @Bean
    public SessionFactory getSessionFactory() {
        // no need to check for null here because if the unwrap fails, it will do
        // so by throwing a PersistenceException rather than returning null.
        return entityManager.unwrap( Session.class ).getFactory();
    }
}