Is it thead safe to make query to the same EntityManager from multiple threads?

[anfernee.xu]

Hello,

Maybe it's not Spring specific question, but as it gains a lot of attention and a lot of guru around it, so my question could be answered here without confusion.

I'm using Spring and Hibernate in my DAO layer, below is my a DAO code snippets.

@Service("SomeDao")
@Repository
public class SomeDaoImpl implements SomeDao {

@PersistenceContext
private EntityManager em;

public Collection loadSomething(String query) {
Query query = em.createQuery(...);
return query.getResultList();
}
}

Per http://static.springsource.org/sprin...m-jpa-straight, the EntityManager is bound to a transaction, and thus it's thread safe, but in my application the 'loadSomething' can be called by multiple threads, though it's read-only, I'm not sure if it's thead safe or not having any other issues?

Thanks for your advice.

[dr_pompeii]

Hello

use code tags the next time


About this

the EntityManager is bound to a transaction, and thus it's thread safe,

In your same provided link Implementing DAOs based on plain JPA (BTW 2.5.x version) said

While EntityManagerFactory instances are thread-safe, EntityManager instances are not