Re: BMP/T, optimistic locking and trying to revert a commit

Throw an EJBException from EJBStore. Catch the exception in the SB
and call rollback, then retry.

> -----Original Message-----
> From: A mailing list for Enterprise JavaBeans development
> [mailto:[email protected]]On Behalf Of Pablo Schor
> Sent: Thursday, 15 January 2004 11:35 a.m.
> To: [email protected]
> Subject: BMP/T, optimistic locking and trying to revert a commit
>
>
> I have the following situation: Jboss 3.2.1,  one statless
> session bean, one BMP entity beans. The session bean updates the
> table through _BMT_, but the ejbStore has a "version=v" in the
> where clause and if it fails (no rows updated), it has to throw
> an exception to the session bean.
>
>
> The container executes the ejbStore() method when the session
> bean issues a commit, but if the version is incorrect, the BMP
> throws an exception - trying to rollback since the update clause
> didn't update the required row.
>
>
> Questions:
>
> 1. What Exception should the BMP throw? Can a BMP throw an
> application specific exception? if not, how can the BMP notify
> the session bean the fact no rows were updated?
> 2. In any case, can the commit be reverted?
>
>
> Thanks for any info,
> PS
>
>
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