When does hibernate detatch persistent objects from session

hsaha · **Joined:** Mon Jul 21, 2008 3:13 am **Posts:** 3

Hi,
I would like to know when hibernate detaches persistent objects from session. Is it :
- session.clear()
- session.close()
- session.flush()

I am facing a problem where objects are still attached to the hibernate session even after a session.close(). The same behavior is also observed even if i set the hibernate.transaction.flush_before_completion to true.

FYI .. the transaction factory used in my application is the default JDBCTransactionFactory.

Following is my code snippet.

Code:

Transaction tx = session.beginTransaction();
xxx.....
session.save(transientObject);
tx.commit();
session.close()

Help would be greatly appreciated.

Regards,
Himadri

amersohail794 · **Joined:** Wed Sep 21, 2005 8:18 am **Posts:** 31

objects are detached when session.clear or session.close() is called or when objects are written to any stream.

How did u know that objects are still attached even if session.close() is called?

hsaha · **Joined:** Mon Jul 21, 2008 3:13 am **Posts:** 3

I profiled my application and observed the same.
Any clues on whether the transactionmanager and anything else that might cause the issue.

Forgot to mention something- our application is using the Hibernate Connection pool. Is this causing an issue. I know that Hibernate connection pool is not recommended, but i would like to solve this problem before proceeding with configuration change in my application.

Thanks
Himadri

amersohail794 · **Joined:** Wed Sep 21, 2005 8:18 am **Posts:** 31

Well i don't think so that objects are still attached with same session. Do one thing to confirm it:

After closing session, create new object and assign it same id as of saved object. Then open a session and save this new object. If you recieve error "a different object with same identifier already exists", then you are right otherwise don't worry everything is ok and objects are attached.

Cameron McKenzie · **Posted:** Mon Jul 21, 2008 7:37 am

Are you using openSession or getSession?

Once that Hibernate Session is closed, then the objects are detached, and I've never seen them reattach themselves. Something strange is going on.

Check out this tutorial on How Hibernate Works. It might give you a bit more insight on what's going on:

http://www.hiberbook.com/HiberBookWeb/learn.jsp?tutorial=07howhibernateworks

hsaha · **Joined:** Mon Jul 21, 2008 3:13 am **Posts:** 3

I am using factory.openSession()

Cameron McKenzie · **Posted:** Fri Jul 25, 2008 4:46 pm

Do you have a compelling reason to use openSession over getSession? Are you aware of the differences?

If a serious decisions wasn't made behind the use of openSession, you will probably avoid some of these issues by using getSession.

Give it a try.