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Nested transaction and Session

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keviny

Post subject: Nested transaction and Session

Posted: Wed Nov 05, 2003 5:28 am

Beginner

Joined: Wed Aug 27, 2003 6:15 am
Posts: 22

Hi all

Supposed I have 2 EJB, A and B. Each starts its own transaction by declaring "RequiresNew".

Then, in EJBA, we retreive an object and examine its value. Afterwards we make a call to EJBB, which retrieves the same object and alter its value. When EJBB returns, the new value will be committed to the DB. What happens to the object back in the first transaction?

Will the Session object be smart enough to know this? How can I make sure EJBA does not get stale data?

Thanks a lot.

Regards
Kevin

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steve

Post subject:

Posted: Wed Nov 05, 2003 9:38 am

Hibernate Team

Joined: Tue Aug 26, 2003 3:00 pm
Posts: 1816
Location: Austin, TX

Depends if both of the ejbs are using the same session or not.

If it's the same session, then the initial ejb would see the changes made by the subsequent ejb.

If they use different sessions, then the opposite would be true. You would need to reload or refresh the entity back in the initial ejb.

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