You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@geronimo.apache.org by Vamsavardhana Reddy <c1...@gmail.com> on 2008/12/11 16:12:01 UTC

Dependency injection in HttpSessionBindingListener

As part of SCA JavaEE Integration, I am looking at dependency injection into
HttpSessionBindingListener's in web apps.  HttpSessionBindingListener is
different from other listeners in that HttpSessionBindingListener need not
be specified in web.xml.  HttpSessionBindingListener gets activated
automatically when an object of that type (implementing
HttpSessionBindingListener actually) is bound to HttpSession. Other
listeners are specified in web.xml and their instantiation is done by the
web container.  Because of this, at deployment time, the web builder does
not even know if there is any HttpSessionBindingListener that it should
process to support dependency injection.  Any thing I am failing to see?

Vamsi

Re: Dependency injection in HttpSessionBindingListener

Posted by David Jencks <da...@yahoo.com>.
On Dec 11, 2008, at 8:58 PM, Vamsavardhana Reddy wrote:

> Section 5.4.1 in SCA JEE Integration spec v1.0, the table at line  
> 484 lists HttpSessionBindingListener.  Do you think we should get  
> rid of that entry?

Yes.  IMO the only things that can plausibly have container mediated  
dependency injection are the objects the container creates.

thanks
david jencks

>
>
> ++Vamsi
>
> On Thu, Dec 11, 2008 at 11:15 PM, David Jencks  
> <da...@yahoo.com> wrote:
> Why do you think that HttpSessionBindingListeners should support  
> dependecy injection?  They aren't managed objects AFAICT and as you  
> state.  Is there something I've overlooked in the spec?
>
> thanks
> david jencks
>
> On Dec 11, 2008, at 7:12 AM, Vamsavardhana Reddy wrote:
>
>> As part of SCA JavaEE Integration, I am looking at dependency  
>> injection into HttpSessionBindingListener's in web apps.   
>> HttpSessionBindingListener is different from other listeners in  
>> that HttpSessionBindingListener need not be specified in web.xml.   
>> HttpSessionBindingListener gets activated automatically when an  
>> object of that type (implementing HttpSessionBindingListener  
>> actually) is bound to HttpSession. Other listeners are specified in  
>> web.xml and their instantiation is done by the web container.   
>> Because of this, at deployment time, the web builder does not even  
>> know if there is any HttpSessionBindingListener that it should  
>> process to support dependency injection.  Any thing I am failing to  
>> see?
>>
>> Vamsi
>
>
>
>
> -- 
> Vamsi

Re: Dependency injection in HttpSessionBindingListener

Posted by Vamsavardhana Reddy <c1...@gmail.com>.
Section 5.4.1 in SCA JEE Integration spec v1.0, the table at line 484 lists
HttpSessionBindingListener.  Do you think we should get rid of that entry?

++Vamsi

On Thu, Dec 11, 2008 at 11:15 PM, David Jencks <da...@yahoo.com>wrote:

> Why do you think that HttpSessionBindingListeners should support dependecy
> injection?  They aren't managed objects AFAICT and as you state.  Is there
> something I've overlooked in the spec?
> thanks
> david jencks
>
> On Dec 11, 2008, at 7:12 AM, Vamsavardhana Reddy wrote:
>
> As part of SCA JavaEE Integration, I am looking at dependency injection
> into HttpSessionBindingListener's in web apps.  HttpSessionBindingListener
> is different from other listeners in that HttpSessionBindingListener need
> not be specified in web.xml.  HttpSessionBindingListener gets activated
> automatically when an object of that type (implementing
> HttpSessionBindingListener actually) is bound to HttpSession. Other
> listeners are specified in web.xml and their instantiation is done by the
> web container.  Because of this, at deployment time, the web builder does
> not even know if there is any HttpSessionBindingListener that it should
> process to support dependency injection.  Any thing I am failing to see?
>
> Vamsi
>
>
>


-- 
Vamsi

Re: Dependency injection in HttpSessionBindingListener

Posted by David Jencks <da...@yahoo.com>.
Why do you think that HttpSessionBindingListeners should support  
dependecy injection?  They aren't managed objects AFAICT and as you  
state.  Is there something I've overlooked in the spec?

thanks
david jencks

On Dec 11, 2008, at 7:12 AM, Vamsavardhana Reddy wrote:

> As part of SCA JavaEE Integration, I am looking at dependency  
> injection into HttpSessionBindingListener's in web apps.   
> HttpSessionBindingListener is different from other listeners in that  
> HttpSessionBindingListener need not be specified in web.xml.   
> HttpSessionBindingListener gets activated automatically when an  
> object of that type (implementing HttpSessionBindingListener  
> actually) is bound to HttpSession. Other listeners are specified in  
> web.xml and their instantiation is done by the web container.   
> Because of this, at deployment time, the web builder does not even  
> know if there is any HttpSessionBindingListener that it should  
> process to support dependency injection.  Any thing I am failing to  
> see?
>
> Vamsi