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From "Davanum Srinivas" <>
Subject Re: Annotation processing
Date Tue, 12 Dec 2006 18:09:02 GMT

We have some in Axis2's JAX-WS module as well. i need to dig into that..

-- dims

On 12/12/06, David Jencks <> wrote:
> I think we have a lot of work to do for annotation processing, and I
> don't recall seeing any discussion of the steps involved.  I haven't
> read most of the specs involved so what I say is probably full of
> errors, but this provides a great opportunity to correct me :-)
> I think there are 2 kinds of annotations: some describe something
> about the class that is exposed to the outside world, such as
> @WebService, and some describe something supplied to the class from
> its environment, such as @Resource.   The @Resource type annotations
> result in something getting bound in the components java:comp/env
> jndi context, and then that thing getting assigned to the annotated
> field.
> I believe all of these need to be translated to the xml in the spec
> deployment descriptor and made available through jsr-77.  This is a
> pretty major change to jsr-77 since previously we were supposed to
> provide the dd unchanged as a string.
> I think that there is no further information needed for the
> "exposing" annotations: once they are in the xml, we can just deploy
> from the xml and we're done.  However for the "resource injection"
> annotations, we still need some code to get the object out of jndi
> and put it into the field.
> So, here's how I imagine this working:
> Deploy time:
> 1. scan all the classes for annotations
> 2. process them into the xml descriptor
> 3. deploy from the modified xml descriptor, includiing constructing
> the jndi tree (as done currently)
> 4. add objects to inject resources
> Run time:
> start up just like we do now
> So, I don't think we have any of this code in geronimo.  I suspect
> there is a bunch of simliar code in other projects such as openejb,
> openjpa, and cxf (at least)  How much can we crib from elsewhere?
> Comments desperately needed :-)
> thanks
> david jencks

Davanum Srinivas : (Oxygen for Web Service Developers)

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