[jsr-314-open] request for listeners to support container injection and life-cycle callbacks

[Dan Allen]

On Tue, Jul 21, 2009 at 1:08 PM, Kito Mann <kito.mann at virtua.com> wrote:

> On Tue, Jul 21, 2009 at 12:42 AM, Dan Allen <dan.j.allen at gmail.com> wrote:
>
>> One of the questions that is often raised when discussing Java EE
>> integration (JSR-299 and EJB) is how to get a reference to a
>> container-managed resource from within a JSF listener (e.g., EJB session
>> bean, BeanManager, EntityManager). While Java EE certainly provides
>> mechanisms to lookup up a resource, such as through JNDI, I think we need to
>> restate the question at hand. Why is it that JSF listeners don't support
>> Java EE resource injection like managed beans. Requiring this functionality
>> in a Java EE environment would go a long way towards making JSF extensions
>> (such as Seam or ADF) portable and generally make the effort of integration
>> w/ container-managed resources easier.
>>
>> With that said, I would like to propose for the next rev of the JSF
>> specification that listeners, in addition to managed beans, support
>> container injection and life-cycle callbacks when JSF is run in a Java EE
>> environment (the rule for servlet containers would parallel that of managed
>> beans today).
>>
>> Listeners include:
>>
>> PhaseListener
>> SystemEventListener
>> BehaviorListener? (not sure)
>
>
> So the easiest way to do this would be to accept an expression any time a
> listener is declared, correct? This is possible today with the <f:view> tag
> for PhaseListeners, but not in faces-config.xml. In the other cases, we do
> have support for expressions.
>

I think you may be looking at it too narrowly. What we really want is for
listeners to be managed beans, since most of the Java EE platform is going
in that direction (and in some regards already there). We don't want
something JSF-specific like EL expressions being passed in. What we really
want is @PostConstruct, resource injection, etc. In other words, we want
these classes to work within the context of the Java EE environment, rather
than as outliers.

-Dan

-- 
Dan Allen
Senior Software Engineer, Red Hat | Author of Seam in Action
Registered Linux User #231597

http://mojavelinux.com
http://mojavelinux.com/seaminaction
http://in.relation.to/Bloggers/Dan
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