[jbossseam-issues] [JBoss JIRA] Commented: (JBSEAM-1144) Make org.jboss.seam.util.Transactions a seam component

Thu Apr 12 02:11:01 EDT 2007

    [ http://jira.jboss.com/jira/browse/JBSEAM-1144?page=comments#action_12359040 ] 

Christian Bauer commented on JBSEAM-1144:
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There are two sides to this:

- I have nothing against exposing the transaction service as a Seam component if that is what fits best into the overall architecture. Whatever makes the system more cohesive is fine.

- How will users perceive and use this extension (independent from how it's implemented) and what are the long term effects. They will continue using whatever legacy code they have. Our component will wrap it. There is no migration path because we do everything for them, wrap and hide their legacy code. They will not realize that they should use JTA - from a users perspective everything works fine. They will start new projects using org.hibernate.Transaction and Spring transaction management. The JTA vendors will not realize their stuff should be made easier to use because nobody is using it. You will never be able to remove these components. The time is _now_ to break this circle, we only get a chance like this every 5 years.

Michael, note that I am not saying that we should not implement what you have done, it will certainly be integrated into Seam. The question is how we communicate it to users. IMO it should be hidden as good as possible behind a "migrate to JTA" manual. But, from experience I know that if we all forget to agree on this at this stage, it will not happen and the wrapper will just creep into the documentation with the negative effects I describe.

Btw, some colleagues are currently working on an extension to the main Hibernate tutorial that describes how to install JBoss TS with JTA, right after Hello World. The overview for the other JTA providers posted yesterday on the forum is also a great resource we need to leverage for this kind of documentation. Let's do what we can on this front before this component is committed.

> Make org.jboss.seam.util.Transactions a seam component
> ------------------------------------------------------
>
>                 Key: JBSEAM-1144
>                 URL: http://jira.jboss.com/jira/browse/JBSEAM-1144
>             Project: JBoss Seam
>          Issue Type: Feature Request
>          Components: Core
>    Affects Versions: 1.2.1.GA
>            Reporter: Michael Youngstrom
>             Fix For: 1.3.0.BETA1
>
>         Attachments: seam-tx-2.zip, seam-tx.patch
>
>
> I know this is probably a loaded issue but please hear me out. :)  It would be nice if org.jboss.seam.util.Transactions was replaced with a Seam Component just like everything else in Seam.  This would allow for pluggable Transaction Management providers and pave the way for support for Spring Managed Transactions, JPA Local Transactions, and true Hibernate Local Transactions.  This will allow Seam applications to run without a dependency on microcontainer in tomcat and allow for tighter Framework integration with spring and others.
> I would personally be more than willing to do the work of making the an initial JTATransaction component(s) as a replacement for org.jboss.seam.util.Transactions and would also create a SpringTransaction component as a proof of concept for extending the Transaction component.
> One problem I can see off hand is we may have to interact with a transaction in some places where a Seam ApplicationContext is not available.  However, I wonder if confining Seam transactions to a seam call might help simplify matters anyway?  For example transaction cleanup could take place in the @Destroy of the transaction component instead of in the ExceptionFilter?
> Also, this wouldn't be looked at as a JTA replacement but rather a service abstraction.  Just like any other java webapp if you're using enterprise services such as EJBs or JCA JTA would be required.  if you're running on tomcat or some other simple web container a resource local transaction manager (Spring's abstraction, JPA's, or Hibernate's) can be used.
> I'm sure there are tons of other problems I'm not looking at but worst case scenario this issue would be a great place to document them and to refer rejected feature requests. (for example JBSEAM-1118)
> What do you think?
> Mike

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