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From Guillaume Nodet <gno...@gmail.com>
Subject Re: [all] OSGI - POOL-160
Date Thu, 25 Feb 2010 16:17:46 GMT
What is the best practices for libraries wrt to importing their own
exported packages.

On Thu, Feb 25, 2010 at 17:15, Karl Pauls <karlpauls@gmail.com> wrote:
> On Thu, Feb 25, 2010 at 5:11 PM, Guillaume Nodet <gnodet@gmail.com> wrote:
>> Guys, can we discuss that and come back with a statement we all agree on ?
>
> Discuss what?
>
> regards,
>
> Karl
>
>> ---------- Forwarded message ----------
>> From: Niall Pemberton <niall.pemberton@gmail.com>
>> Date: Thu, Feb 25, 2010 at 16:26
>> Subject: Re: [all] OSGI - POOL-160
>> To: Commons Developers List <dev@commons.apache.org>
>>
>>
>> On Thu, Feb 25, 2010 at 3:17 PM, Jörg Schaible <joerg.schaible@gmx.de> wrote:
>>> Hi Guillaime,
>>>
>>> Guillaume Nodet wrote at Donnerstag, 25. Februar 2010 15:49:
>>>
>>>> I just had a lively chat with Peter who kinda agreed that
>>>> substitutability issue is mostly important for APIs.
>>>>
>>>> Please have a look at the Felix FAQ entry:
>>>>   http://felix.apache.org/site/apache-felix-osgi-
>>> faq.html#ApacheFelixOSGiFAQ-Shouldabundleimportitsownexportedpackages%253F
>>>> I haven't written it, so I can't be blame for that one.
>>>> The last paragraph says:
>>>>     "The main time you want to export only, is if your bundle is
>>>> purely a library bundle, then its packages will only be used if they
>>>> are needed."
>>>
>>> what we are saying is, that none of us is an OSGi expert and before we
>>> published the first artifact with such information, we took the advice of
>>> the Apache Felix community. If they recommend now something different, we'd
>>> like to get some "official" blessing for the changes, simply because we
>>> cannot really review it.
>>
>> +1
>>
>> Niall
>>
>>
>>>> In all cases, the current imports *are* wrong and need to be fixed,
>>>> because the way they are written will fail if there is any
>>>> incompatible change ever introduced (whatever the version).  And I
>>>> don't think we should guarantee that, especially across major
>>>> versions.
>>>
>>> What has been released is final. We're not able to change that anymore. All
>>> we can do is to change the OSGi information for new releases.
>>>
>>>> Anyway, the problem is the following.
>>>> You install commons-pool 1.5 in the osgi framework.
>>>> Then you install commons-pool 1.4 later.
>>>> What you end up with is:
>>>>
>>>> karaf@root> osgi:list -l | grep commons-pool
>>>> [ 100] [Active     ] [            ] [       ] [   60]
>>>> mvn:commons-pool/commons-pool/1.5.4
>>>> [ 124] [Active     ] [            ] [       ] [   60]
>>>> mvn:commons-pool/commons-pool/1.4
>>>> karaf@root> packages:exports 100
>>>> Commons Pool (100): org.apache.commons.pool.impl; version=1.5.4
>>>> Commons Pool (100): org.apache.commons.pool; version=1.5.4
>>>> karaf@root> packages:exports 124
>>>> Apache Commons Pool Bundle (124): No active exported packages.
>>>> karaf@root> packages:imports 124
>>>> Commons Pool (100): org.apache.commons.pool.impl; version=1.5.4
>>>> Commons Pool (100): org.apache.commons.pool; version=1.5.4
>>>> karaf@root> osgi:start 170
>>>> Error executing command: Unresolved constraint in bundle
>>>> org.apache.activemq.activemq-pool [129]: package;
>>>> (&(package=org.apache.commons.pool.impl)(version>=1.4.0)(!
>>> (version>=1.5.0)))
>>>
>>> While I see an error, it does not tell me a lot ;-)
>>>
>>> - Jörg
>>>
>>>
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>>>
>>>
>>
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>>
>>
>>
>> --
>> Cheers,
>> Guillaume Nodet
>> ------------------------
>> Blog: http://gnodet.blogspot.com/
>> ------------------------
>> Open Source SOA
>> http://fusesource.com
>>
>
>
>
> --
> Karl Pauls
> karlpauls@gmail.com
>



-- 
Cheers,
Guillaume Nodet
------------------------
Blog: http://gnodet.blogspot.com/
------------------------
Open Source SOA
http://fusesource.com

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