Re: [ojb-users] OJB in J2EE env

[Jiri L. <jir...@ho...>]

Thomas,

On Thu, 02 May 2002 19:56:06 +0200, you wrote:
>Hi Jiri,
>
>If optimistic locking is sufficient for you, you might also use the=20
>PersistenceBroker API directly. The PB is also thread-safe.

My question was based on the info in FAQ: "The PB has no means to
check whether objects are used by concurrent threads"


>
>The ODMG level provides object transaction (similar to TopLinks=20
>Unit-of-work) that you don't have on the PB level.

I see... I'm familiar with the concept ;-)


>If you need those things (object transations, persistence aware=20
>collections etc.) you should go for ODMG.
>
>If not: use the PB.

Is it possible to combine these two APIs (in one transaction)? I'm
missing the QueryByExample way of work in the ODMG API.

>my ejb sample is rather old. Its also not about session beans, but about=
=20
>using OJB in BMP entity beans.

There is a JTA example using a session bean:
test.ojb.jta.SampleSessionBean


>We are currently working on JTA and JCA integration. Once we have=20
>finished this, we will also provide some documentation about usage in=20
>J2EE containers.

I thought JTA integration is already done... see history.html
I use PersistenceBrokerJ2EEImpl and it seems to work. I'm going to do
thorough tests soon.
Could you just outline what would be the proper way of using ODMG/PB
objects within session bean? Are there any differences comparing to
the "normal" usage described in tutorial2?

>That's intended! Can you imagine how shocked the TOPLink guys are about=20
>this ;-)

Yes, I can. :-)
BTW I was also disapointed by their constant ignorance of the
existence of JBoss. The combination of JBoss + OJB is gonna be the
killer middleware ;-)

Jiri.