Determining the full implications will need to be done but I think this road is worth pursuing.
I'd like to get some use cases from the sponsors though :)
All in all, I think we should think about this from both the SE and EE angle. It's very likely that the specification will stay silent as CDI is only spec'ed for EE and @Inject does not have a way to be started nor looked up. But if we can have a decent integration point to ensure objects like EntityListeners could be provided by a third-party framework and of course have a native integration in EE 7, that will be a big win.
Emmanuel
PS: Bean Validation is in the same situation for Constrain Validators for which we have a ConstraintValidatorFactory customizable component.
On 21 juin 2011, at 22:50, Linda DeMichiel wrote:
> Assuming you all have read the message from Pete Muir which I
> forwarded earlier.....
>
> Entity listeners are not container-managed objects in the sense of
> EJBs or CDI managed beans, and do not have their own independent
> component environment. They are managed by the persistence provider,
> and when they are invoked within JavaEE their naming environment is
> that of the calling component.
>
> To support injection in them, they would presumably need to become
> container-managed objects (as well), and we would need to define their
> lifecycle, add support for PostConstruct, PreDestroy, etc.
>
> While I think I can understand your motivation for wanting this
> functionality, I'm not convinced of the tradeoff in terms of the
> added complexity.
>
> I'd like to hear from others on this point though.
>
> thanks,
>
> Linda
>
>
> On 6/21/2011 5:18 AM, Adam Bien wrote:
>> Hi *
>>
>> EntityListeners should be integrated with CDI / EJB 3.2. It means: Java EE 7 DI should work in EntityListener classes.
>> An EntityListener could be annotated with @Singleton / @Stateless / @RequestScoped etc. (everything what is stateless)
>>
>> We should extend the sentence: "Entity listeners are stateless. The lifecycle of an entity listener is unspecified" at
>> the page 95 of the Expert Group Draft 2. to "The lifecycle of an entity listener is unspecified in unmanaged
>> environments. An EJB 3.2 @Stateless, @Singleton or CDI managed bean can also receive callback events",
>>
>> What do you think?
>>
>> adam