[ http://jira.codehaus.org/browse/MNG-2059?page=comments#action_58274 ] 

Mike Whittemore commented on MNG-2059:
--------------------------------------

Yes, and I do it wherever I can. Here's why I feel the "grouping" funtionality 
would be beneficial:

We organize our projects based on their relationships and not the relationships 
of their dependencies. So, for example, if projects A, B, and C are related 
they will have a common parent pom, and if projects X, Y, and Z are related 
they will have a common parent pom, and both parent poms will have a shared 
parent at some higher level. Projects A, B, and C though closely related, may 
not have the same direct dependencies.

Where my suggestion comes into play is if projects A and Z both need 12 ORB 
dependencies, I'd like to not have to duplicate all 12 in both poms. I'd also 
like to not have to place them in a common parent pom as "regular" dependencies 
because then other projects that don't need those dependencies will inherit 
them. I could move A and Z under a shared parent by themselves, but then I lose 
the logical grouping of the projects (for example A and Z might be totally 
unrelated except that deep down inside they happen to both use CORBA). I feel 
some grouping mechanism is the best way to deal with this, but I'm definitely 
interested in alternate suggestion.

Your suggestion is a good workaround in that it removes the duplication in the 
pom files, but it feels wrong to me in that it makes projects depend on things 
they don't truly depend on.



> Add ability to depend on a group of dependencies with a single dependency 
> element.
> ----------------------------------------------------------------------------------
>
>          Key: MNG-2059
>          URL: http://jira.codehaus.org/browse/MNG-2059
>      Project: Maven 2
>         Type: New Feature

>  Environment: n/a
>     Reporter: Mike Whittemore
>     Priority: Minor

>
>
> It would be convenient and reduce maintenance if Maven2 has the ability to 
> create a group of dependencies and then reference them via a single 
> dependency entry. Something like this:
> In master pom:
> <dependencyGroups>
> &nbsp;&nbsp;<dependencyGroup>
> &nbsp;&nbsp;&nbsp;&nbsp;<name>logging</name>
> &nbsp;&nbsp;&nbsp;&nbsp;<dependencies>
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<dependency>
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<groupId>apache</groupId>
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<artifactId>commons-logging</artifactId>
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</dependency>
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<dependency>
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<groupId>apache</groupId>
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<artifactId>log4j</artifactId>
> &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</dependency>
> &nbsp;&nbsp;&nbsp;&nbsp;<dependencies>
> &nbsp;&nbsp;</dependencyGroup>
> </dependencyGroups>
> In child pom:
> <dependencies>
> &nbsp;&nbsp;<dependency>
> &nbsp;&nbsp;&nbsp;&nbsp;<group>logging</group>
> &nbsp;&nbsp;</dependency>
> </dependencies>
> In my particular case, we have a large software project with a large 
> hierarchy of sub-projects that is continually growing. Many of the projects 
> share the same dependencies, but do not necessarily have a parent-child 
> relationship. If I have several projects that need, for example, the same 12 
> ORB implementation dependencies, it would be nice to declare that group of 12 
> dependencies as a "group" and then reference it from each project.

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