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From "Patrick Linskey" <plins...@bea.com>
Subject RE: Exceptions thrown from callbacks
Date Wed, 07 Feb 2007 02:01:56 GMT
It seems like we've reached consensus around the following behavior at
least:

1. if a callback throws an exception during commit(), wrap in
RollbackException and roll back the transaction.

2. if a callback throws an exception during some non-commit() operation,
do not wrap the exception, and mark the transaction for rollback.

It turns out that this is exactly the current behavior. I just checked
in some test cases to exercise this, since the CTS has an outage here
now.

-Patrick

-- 
Patrick Linskey
BEA Systems, Inc. 

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> -----Original Message-----
> From: Patrick Linskey 
> Sent: Thursday, February 01, 2007 3:27 PM
> To: open-jpa-dev@incubator.apache.org
> Subject: Exceptions thrown from callbacks
> 
> Hi,
> 
> There's a bit of ambiguity in the spec about what should 
> happen when an
> exception is thrown from a callback. 
> 
> I propose that we change OpenJPA's behavior to always wrap exceptions
> thrown from callbacks in a RollbackException. Additionally, I propose
> that if a callback is thrown from a direct flush() call or a find() or
> other data load, we should mark the transaction for rollback 
> instead of
> immediately rolling back the transaction.
> 
> 
> Details:
> 
> Section 3.5 says: 
> 
> "Lifecycle callback methods may throw unchecked/runtime exceptions. A
> runtime exception thrown by a callback method that executes within a
> transaction causes that transaction to be rolled back."
> 
> 3.5.6: 
> 
> "Lifecycle callback methods may throw runtime exceptions. A runtime
> exception thrown by a callback method that executes within a 
> transaction
> causes that transaction to be rolled back. No further 
> lifecycle callback
> methods will be invoked after a runtime exception is thrown."
> 
> 3.7:
> 
> "The PersistenceException is thrown by the persistence provider when a
> problem occurs. [...] All instances of PersistenceException except for
> instances of NoResultException and NonUniqueResultException will cause
> the current transaction, if one is active, to be marked for rollback."
> 
> ...
> 
> "The RollbackException is thrown by the persistence provider when
> EntityTransaction.commit() fails.
> 
> 
> So.... in my opinion, this means that if a callback fails during
> commit(), the exception thrown by the callback clearly should 
> be wrapped
> in a RollbackException. It is less clear to me what should happen if a
> callback fails at some other time, such as during a find() call. In my
> opinion, we should be wrapping the user-thrown exceptions in
> RollbackExceptions all the time.
> 
> Further, I think that 3.7 trumps 3.5.6, so if an exception is thrown
> from a callback during a find(), we should be marking the transaction
> for rollback, rather than actually rolling it back.
> 
> I've got changes in place that implement the behavior I just 
> described.
> The CTS tests surrounding this issue have been excluded, due to the
> ambiguity in the spec.
> 
> Thoughts?
> 
> -Patrick
> 
> -- 
> Patrick Linskey
> BEA Systems, Inc. 
> 
> ______________________________________________________________
> _________
> Notice:  This email message, together with any attachments, 
> may contain
> information  of  BEA Systems,  Inc.,  its subsidiaries  and  
> affiliated
> entities,  that may be confidential,  proprietary,  
> copyrighted  and/or
> legally privileged, and is intended solely for the use of the 
> individual
> or entity named in this message. If you are not the intended 
> recipient,
> and have received this message in error, please immediately 
> return this
> by email and then delete it.
> 

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