JTA transaction unexpectedly rolled back

Question

I have a Spring Java web app deployed on OC4J 10.1.3.3 using Toplink as the container managed persistence. When my app is launched a named query is executed that uses JPQL to load up collections of objects. It is failing with the subject line exception.
org.springframework.transaction.UnexpectedRollbackException: JTA transaction unexpectedly rolled back (maybe due to a timeout); nested exception is javax.transaction.RollbackException: Timed out
If, however, I then modify the URL and force an action that will re-execute the same query, it works fine.
Any ideas on which configuration settings I should investigage/change to enable this to work the first time through?
I am not dealing with large collections here. At this point, there are 11 main objects that have children/parents. Re-execution of the query happens very fast.
Thank you!
Ginni

Answer 1

Hello,
It sounds like its not the query itself that is taking too long, but all the processing done before the query in the same transaction scope. The error is that the transaction is timing out, so you should start by checking when the transaction is started and if the timeout value needs to be increased to cover the time this process is taking, or if the transaction can be made smaller or broken up into smaller peices. Or, if the query is just returning data that isn't going to be modified, if a transaction is required at all.
Best Regards,
Chris