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From Timothy Ward <>
Subject RE: Blueprint and annotations
Date Wed, 08 Sep 2010 08:19:46 GMT

Hi Bengt,

As with many of the Aries projects, we're working to extend standards or introduce new ones
where we feel there are current gaps. An "Application" concept doesn't really exist in OSGi,
but the Aries application work will be fed back into the OSGi standardisation process. We
certainly hope to see a number of Aries technologies (or something very similar) standardised
over the next OSGi releases.



> Date: Wed, 8 Sep 2010 09:07:51 +0200
> Subject: Re: Blueprint and annotations
> From:
> To:;
> Justin,
> Yes, I agree, many options is a good thing. I'm just trying to get some
> overview on things to make it possible to decide on a direction.
> I'm a bit surprised, though, that the OSGi Alliance hasn't standardised
> the annotations - it would make sense I think. But I guess a viable
> path is to use blueprint (XML or annotations) to publish services and
> then use iPojo to consume them?
> I'm also evaluating the concept of an Aries application vs Karaf
> features. Seems like a similar concept to me. Is this Aries specific of
> OSGi standard?
> /Bengt
> 2010/9/7 Justin Edelson
> On 9/7/10 11:32 AM, Bengt Rodehav wrote:
>> Justin,
>> Yes I did actually see this but was unsure of its status. Is the
>> annotations specified by OSGi or are they specific to Aries? I'm
>> guessing the former which makes it interesting for portability reasons.
> The Blueprint spec only covers XML. I would hope that the OSGi alliance
> standardizes annotations.
>> Functionality wise it is very similar to iPojo. However, iPojo does not
>> seem related to blueprint at all (I might be wrong here) but seems to
>> solve the same problem. iPojo, however, has a lot more functionality and
>> also seems to be more mature.
> You are free to use iPojo and Blueprint within the same application.
> This is, to me, one of the best parts about OSGi - how a service is
> published has no bearing on how it is consumed.
>> Have you had any contact with Clement Escoffier at the Felix/iPojo
>> project? Seems like iPojo would be a natural candidate for the blueprint
>> annotation functionality. I'm a bit confused as to what path I should
>> choose and also why there are two different paths regarding this within
>> Apache.
> There's more than 2 within Apache. :)
> There's also an implementation of the Declarative Services spec in the
> Felix project (Felix SCR). The Felix SCR Maven plugin supports
> annotations at compile time to produce the DS descriptor file.
> Justin
>> Do you have more information on this matter?
>> Also, what is the status of Aries blueprint annotation support? Is it
>> being used in production? When will it be released?
>> /Bengt
>> 2010/9/7 Justin Edelson
>> Did you see
>> On 9/7/10 2:57 AM, Bengt Rodehav wrote:
>>> Is it possible to publish and consume blueprint services using
>>> annotations? I've been using iPojo in Karaf before which has
> been very
>>> convenient.
>>> /Bengt
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