Hibernate 3 and StatelessSession

[aaime]

Hi,
I've developed my dao layer using Hibernate 3, HibernateDaoSupport and transaction/session managed by Spring at the service layer (I do have services that do use daos, but only services are wrapped to automatically open transactions and sessions).

Now, for a very few calls I'd need to work with StatelessSessions, basically to improve performance since I have to load a ton of objects that I need to send directly to a rich client without modifications.

Is there a suggested approach to use stateless sessions in daos that otherwise would use HibernateTemplate?

[Costin Leau]

The current Hibernate support relies only on HB session. Since StatelessSession and Session are totally different there isn't any sharing that can be done between them.
One quick solution is to create StatelessSessions based on the underlying connection of an normal Session class. This way, the StatelessSession will be enlisted in the undergoing transaction.
Please raise an issue on JIRA so such functionality can be incorporated in future Spring releases.

[aaime]

I tried that already, but Hibernate wasn't happy about it, and threw an error complaining about a possible concurrent modification of some internal data structure (there was none, it was a simple unit test).

It seems the two cannot be mixed easily...

[springer83]

Hi aaime,

I also tried Costin's suggestion but it gives the session conflict as you mentioned.

So finally did you manage to find any way to open statelessSession with hibernate template?

whats else is the solution for this problem?
Any idea?

Thanks.

[dma_k]

aaime, see SPR-6202 for more information about the progress for this feature.

[aquariusjanak]

The current Hibernate support relies only on HB session. Since StatelessSession and Session are totally different there isn't any sharing that can be done between them.
One quick solution is to create StatelessSessions based on the underlying connection of an normal Session class. This way, the StatelessSession will be enlisted in the undergoing transaction.
Please raise an issue on JIRA so such functionality can be incorporated in future Spring releases.

Really good posting.
Quite useful.
Thanks for sharing this here.