Obtaining handle to EntityManager in Spring Boot

Question

Is there any way to get a handle to the EntityManager for a given entity object? I\'m using spring boot 1.2.3 with JPA starter and i\'m further explicitly configuring multiple d

Answer 1

It depends how you've been configuring this but have you tried to inject the EntityManager with a qualifier that corresponds to the factory that created it?

Here is a sample project with two data sources. If you want to inject the EntityManager for order, just do the following in any Spring bean of the project

@Service
public class FooService {

    private final EntityManager entityManager;

    @Autowired
    public FooService(@Qualifier("orderEntityManager") EntityManager entityManager) {
        ...
    }

}

For customer, use the customerEntityManager.

Of course you can use the persistent unit name instead, that is

@PersistenceContext(unitName = "customers")
private EntityManager entityManager;

@PersistenceContext(unitName = "orders")
private EntityManager entityManager;

Check the configuration of the project for more details.