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From "Alan D. Cabrera" <>
Subject Re: Geronimo specs jars in OSGi
Date Thu, 17 Apr 2008 14:11:59 GMT

On Apr 16, 2008, at 8:49 AM, David Jencks wrote:

> I'd like to see an example in action before I commit myself but so  
> far I don't see any problems with this.  I assume you have already  
> or will soon verify this doesn't cause problems with the tck :-)
> I wonder if a package name with "osgi" in it somewhere would be more  
> appropriate?
> There are some specs (jacc for instance) that use a system property  
> to figure out what to create.  I've always thought this was a less  
> than brilliant idea and wonder if we can do something similar for  
> those.  I also wonder if there is a way to generalize the osgi  
> method so it might work in some non-osgi environments.  I'm looking  
> forward to seeing what you have in mind.
> thanks
> david jencks
> On Apr 16, 2008, at 8:20 AM, Guillaume Nodet wrote:
>> In the past months, I've been working on making the specs jars from  
>> Geronimo working in an OSGi environment.
>> All these jars have been published and work great :-)
>> However, lots of these spec jars define factories (stax, saaj for  
>> example) that use the META-INF/services/ discovery mechanism to  
>> find an implementation of the spec and load it.  This mechanism  
>> does not fit well in OSGi (really, it does not), mainly because  
>> usually, the classloader containing the spec jar will not contain  
>> the implementation.
>> I'd like to work on these spec jars so that they will contain an  
>> OSGi BundleActivator that would change the behavior of these  
>> factories when deployed in an OSGi environment (without changing  
>> the behavior in other case).  The idea is that the activator would  
>> scan OSGi bundles when they are started to find META-INF/services  
>> and populate a map that would be used by the factory when creating  
>> an object before using the standard mechanism.
>> The only real difference compared to what we currently have would  
>> be the addition of a package named org.apache.geronimo.specs.stax  
>> (for example) that would contain the needed classes (i suppose two  
>> classes), and the modification of the factories to delegate to one  
>> of these class before using the standard behavior (the class would  
>> do nothing if not deployed in an OSGi environment).
>> Has anyone any objection with such an enhancement in the specs jar ?

-1 technical veto

These are spec jars and extending the behavior of these jars on an ad  
hoc basis is bad and possibly violates the licenses of the JSRs they  


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