Re: EJB Transaction

Hi,
Forget about POJO. Calling a POJO method is like calling a local method.

best regards
Hardy Henneberg

Karen Low wrote:

> Hi,
>
> I was trying to find out what will be the transaction like for the
> following scenario:
>
> Imagine a servlet method get invokes and it's a deep request which
> does 2 db calls, one is insert, another one is update.
>
> Action class (Servlet):
>      ---> Stateless Session Bean (1)  ---> POJO ---> Stateless Session
> Bean (2) ---> POJO (DAO) ==> DB (insert)
>      ---> Stateless Session Bean (1)  ---> POJO ---> Stateless Session
> Bean (2) ---> POJO (DAO) ==> DB (update)
>
> Legend:
> ---> calls a method
> ==> DB sql execution
>
> All EJBs are container managed with transaction attribute set to
> "Required". All classes mentioned above are packaged into one ear and
> deployed into 1 app server.
>
> Considering the above scenario, will all the method calls above falls
> into 1 transaction? Is rollback possible in this scenario? Are they
> consider in the same session? If the ear is deployed into the same
> application server, even to different container (serlvet deployed to
> servlet container, EJBs deployed to EJB container), are the objects
> sharing the same JVM?
>
> I have read about EJB transactions, but the information that I found
> are mainly for EJB to local/remote EJB kind, is there any information
> that you can recommend me to read about transaction behaviour that
> relates to EJB to POJO or vice versa?
>
> Any thoughts and experience shared are much appreciated.
>
> Thank you very much.
>
> Regards,
> Karen
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--
Hardy Henneberg
Henneberg Consult
http://www.hhenne.dk

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