Re: [jboss-as7-dev] detecting JPA usage in AS7 applications...
On 06/10/2011 06:24 AM, Scott Marlow wrote:
> The reason I ask this is because if we introduce this feature,
then just
> relying on @PersistenceUnit and @PersistenceContext annotations won't be
> enough, since users might lookup the EntityManagerFactory/EntityManager
> via JNDI and in such cases too we will require the JPA module
> dependencies to be added implicitly.
It would be nice if users had the ability to explicitly mark a
deployment as an EE JPA deployment or not a EE JPA deployment.
I agree with that. I suppose that in those cases, persistence annotation
processing will be completely turned off. This would also help Spring
applications that do not use EE JPA (even if that is what we would
prefer them to do), but are adamant about using a META-INF/persistence.xml.
I was thinking that we could use the jboss-ignore.txt feature, but
right now, even that is not enough for getting those apps to work - even
if the PU will not deploy, @PC/@PU annotations will be processed *and*
validated, which means that the deployment will inevitably fail (no PU
found).
How about having a special deployment descriptor
(jboss-<something>.xml), which can be used for turning off blocks of
features for a particular deployment (rather than not seeing
META-INF/persistence.xml, you could simply have a
<disable-jpa-deployer>true<disable-jpa-deployer/> flag). The presence of
this flag could disable the whole subsystem for this particular
deployment, in a more consistent fashion).