[seam-dev] Re: Seam 2.1.0.GA testing on AS 5 CR2 status

[Pete Muir]

On 22 Oct 2008, at 06:12, Dan Allen wrote:

>
>
> It's actually the WarStructure that understands it. ;-)
> - http://anonsvn.jboss.org/repos/jbossas/trunk/server/src/main/org/jboss/web/deployers/WARStructure.java
>
> Ok, then we're going need different components.xml for JBoss 4.2 and  
> JBoss 5.
>
> https://jira.jboss.org/jira/browse/JBSEAM-3579
>
> Yes, in fact with any Java EE 5 container, we should make it a  
> policy in the examples to assume that the container is taking care  
> of the persistence unit rather than Seam. Seam should only step in  
> when the container isn't willing or able (such as with JBoss AS 4.2).

What? This isn't something that is mandated by the EE5 spec so how  
does this work? Looking up the EMF over JNDI only works in JBoss. The  
problem here isn't about EMF lookup, it's about whether the container  
deploys the PU or not (JBoss 4.2 doesn't for a war, whilst JBoss 5  
does).

>
>
> Just as a side note, it would be really cool if we could have a way  
> to configure the persistence in Seam such that Seam will look for  
> the JNDI name and if that fails, it falls back to having Seam  
> bootstrap the PU. This is a matter of putting both in place and  
> letting Seam pick.
>
> <persistence:managed-persistence-context name="entityManager"
>   auto-create="true"
>   persistence-unit-jndi-name="java:/appNamePU"
>   entity-manager-factory="#{entityManagerFactoryUsedIfNecessary}"/>
>
> <persistence:entity-manager-factory  
> name="entityManagerFactoryUsedIfNecessary"
>   persistence-unit-name="appNamePU"
>   persistence-unit-jndi-name="java:/appNamePU"/>
>
> This is not vetted yet, but by adding the persistence-unit-jndi-name  
> to the entity manager factory, it could disable Seam bootstrapping  
> if the JNDI lookup returns a hit. Then, the managed persistence  
> context goes through similar logic when it is being created.
>
> -Dan
>
> -- 
> Dan Allen
> Software consultant | Author of Seam in Action
>
> http://mojavelinux.com
> http://mojavelinux.com/seaminaction
>
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