[seam-dev] automatic loading of persistence units in JBoss AS 5

[Gavin King]

If you dont want a PC in that deployment, dont put the persistence.XML  
file in the ear. I dont get the problem.

Sent from my iPhone

On Dec 1, 2008, at 4:22 PM, "Dan Allen" <dan.j.allen at gmail.com> wrote:

> One of the changes in JBoss AS 5 that comes as a surprise for many
> Seam developers/users familiar with the behavior of JBoss AS 4 is the
> automatic loading of persistence units from /META-INF/persistence.xml.
> (As expected, we had to change several of the Seam examples to
> accommodate this change). This is one of those configuration by
> exception features in Java EE 5, with one significant exception. While
> the container will locate the /META-INF/persistence.xml file on its
> own, a container that goes by the book will only deploy the
> persistence unit if a resource reference is declared in the descriptor
> file (web.xml or ejb-jar.xml). JBoss AS does not wait for this signal.
>
> In my opinion, there is a problem with the JBoss AS approach. What if
> you have persistence units that you don't want to deploy? One use case
> is that you have persistence units for different environments and a
> configuration file can toggle between them. Another use case is that
> you have another library, such as Spring or Seam, which bootstraps the
> persistence unit instead. Sure, you could rename the file, but then
> you break all the IDE behavior that expects the file to be named
> persistence.xml. Personally, I think there should be some way to
> disable the behavior in JBoss AS and make it look for the persistence
> unit references. I agree to keep the automatic loading as the default,
> but it is pretty inconvenient not to be able to disable it.
>
> Anyone else agree? Disagree? Why?
>
> -Dan
>
> -- 
> Dan Allen
> Software consultant | Author of Seam in Action
>
> http://mojavelinux.com
> http://mojavelinux.com/seaminaction
>
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