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

Christian Bauer (JIRA) jira-events at lists.jboss.org
Wed Apr 11 06:21:58 EDT 2007

    [ http://jira.jboss.com/jira/browse/JBSEAM-1144?page=comments#action_12358911 ] 
Christian Bauer commented on JBSEAM-1144:

"However, the biggest problem I have with the strict use of JTA in Seam it's dependence on JNDI. There may be many great JTA runtimes available but they become a beast (with the exception of microcontainer) to configure when it comes to trying to correctly expose them with JNDI not to mention your datasources that must be wrapped and exposed through JNDI as well. "

Then let's fix that. We should _not_ wrap a standard API. The "benefits" you list are all just nice words, wrapping does not make things more portable (if what you wrap is by definition already an interface), more lightweight (what does that mean?), easier to configure (making JTA providers easier to configure makes stuff easier to configure) and it does reduce dependencies (on what? jta-api.jar?)

Folks, it is time to put more pressure on vendors who provide JTA services. They need to make their stuff easier to setup and use. The solution is not another layer of transaction wrapping in Seam, you end up with an horrendous stack that you will _never_ be able to deprecate.

And there is no such thing as "applications that don't need JTA". Seriously, realize that this is the standard interface in Java! What else do you want to use? JDBC? EntityTransaction? Spring magic?

If you want to set transaction boundaries, you do this with JTA or you have a container that understands @TransactionAttribute. I even think the addition of @Transactional in Seam was a serious mistake and I don't know why Gavin (who does know better) added it.

> 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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