We've used different groupIds for GMF Tooling and we are pretty happy with it.
So we have groupIds:
* org.eclipse.gmf.tooling for artifactId "parent" (root pom.xml)
* org.eclipse.gmf.tooling.plugins for all artifacts in folder "plugins"
* org.eclipse.gmf.tooling.tests for all artifacts in folder "tests"
* org.eclipse.gmf.tooling.features for all artifcts in folder "features"
and so on...

Then it is quite easy to map an artifact with a location in the codebase, and everything is under the org/eclipse/gmf/tooling folder in M2_REPO. It's easy to clean.

My 2c.
Regards,

On 13/12/2011 13:19, Sievers, Jan wrote:
there was discussion on tycho-dev

http://dev.eclipse.org/mhonarc/lists/tycho-dev/msg00369.html

we don't want to push established projects to break API.
At the same time tycho needs a mapping of OSGi/eclipse artifact ids to maven 
artifact ids.
For now I think your only option is to use a different groupId.

Feel free to comment on the proposal above which would allow to use the same 
groupId
for features and bundles with the same id and instead append ".feature.group"
to the maven artifactId of the feature (inspired by how p2 solved a similar 
problem for the IU namespace)

Regards,
Jan


From: [email protected] 
[mailto:[email protected]] On Behalf Of Oberhuber, 
Martin
Sent: Dienstag, 13. Dezember 2011 13:04
To: Cross project issues ([email protected])
Subject: [cross-project-issues-dev] Tycho and FeatureID == BundleID

Hi all,

As our TM/RSE project is starting migration to Tycho, we're running into the 
Tycho limitation that some of our features include a branding plugin with the 
same name; and featureID == bundleID needs to be treated specially for 
Maven/Tycho. From what I've seen so far,

- New / incubating projects typically rename their features e.g. by appending a 
".feature" postfix, e.g. "org.eclipse.rse.feature"
- But this is a breaking change for consumers including features, so some projects rename 
the branding plugin instead (e.g. appending a ".core" postfix)
- But this is a breaking change for consumers which depend on the bundle, so 
some (particularly older) projects use a special Maven groupID for the features 
as per https://bugs.eclipse.org/bugs/show_bug.cgi?id=353384#c7

I'm leaning towards the 3rd option (special Maven GroupID for features) since I don't 
want to break existing adopters. I've seen comments saying that two groupID's in one 
project is confusing when cleaning a repo, but on the other hand I understand that the 
groupID translates into a directory hierarchy in Maven. So appending a 
".features" to the groupID ends up as a subdirectory which seems OK to me.

Any comments on the approach ?
What have others done ?

Regarding the groupID itself, there was discussion [1] between "org.eclipse" flat for all, or 
"org.eclipse.(3rdBundleSegment)", or "org.eclipse.(projectID)" . we have never officially 
resolved the original question, but it seems to me that the de-facto trend goes towards the 2nd option with 
very few exceptions. So it looks like in TM/RSE we're going to get 5 groupIDs in total:
- org.eclipse.dstore
- org.eclipse.rse
- org.eclipse.rse.features
- org.eclipse.tm
- org.eclipse.tm.features

Does that sound acceptable, or should we rather fold the .dstore groupID into 
the .rse namespace ?

[1] https://bugs.eclipse.org/bugs/show_bug.cgi?id=288644

Thanks,
Martin
--
Martin Oberhuber, SMTS / Product Architect - Development Tools, Wind River
direct +43.662.457915.85  fax +43.662.457915.6

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