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From j...@codehaus.org
Subject [jira] Commented: (MAVEN-1084) Composition of dependencies from many projects (a route round multiple inheritance)
Date Thu, 18 Dec 2003 10:00:54 GMT
The following comment has been added to this issue:

     Author: Mike Melia
    Created: Thu, 18 Dec 2003 3:58 AM
       Body:
I'm not sure I completely understand your comment. I think you agreed that currently you can
only inherit dependencies from one source but you didn't say whether it was a planned (or
required) future feature. If it is desirable then I'll upload a patch.

I'll try to explain more the scenario a bit better this time. 
Dependencies can be inherited from the parent but sometimes you want to inherit dependencies
from more than one source - usually to cut down on the duplication of dependency declaration.

e.g.
if an EJB project declares dependencies on jars A, B and C with the ejb.manifest.classpath
value set to true then the chances are that the EAR project will declare the same dependencies
(A, B and C) with the ear.bundle value set to true. 
A third project (the utility jar project) will have dependencies D and E - which, consequently,
will also be ear.bundle dependencies for the EAR project.

The scenario I would prefer would be the following:

Master project.xml defines the usual project properties.
--Util
   project.xml extends the Master project.xml and defines the dependencies for the utility
project
--EJB
   project.xml extends the Master project.xml and defines the dependencies for the EJB project
--EAR   
   project.xml extends the Master project.xml and also indicates that it is inheriting the
dependencies from the Util and EJB project.xml files.

So, the solution would allow inheritance of dependencies from more than one source which cuts
down on duplication. This is a good thing if, like me, you are setting up project.xml files
for 80+ inter-related projects.
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View the issue:

  http://jira.codehaus.org/secure/ViewIssue.jspa?key=MAVEN-1084


Here is an overview of the issue:
---------------------------------------------------------------------
        Key: MAVEN-1084
    Summary: Composition of dependencies from many projects (a route round multiple inheritance)
       Type: New Feature

     Status: Unassigned
   Priority: Minor

 Original Estimate: 4 hours
 Time Spent: Unknown
  Remaining: 4 hours

    Project: maven
 Components: 
             core

   Assignee: 
   Reporter: Mike Melia

    Created: Wed, 17 Dec 2003 12:40 AM
    Updated: Thu, 18 Dec 2003 3:58 AM

Description:
I have an EAR project that has (mostly) the same dependencies as an EJB project. 
The EAR project includes the dependent jars in the EAR artifact. 
The EJB project requires the dependent jars for compilation and for them to be included in
the manifest classpath.
I also have another project that builds a utility jar for use by both the EAR and EJB project.

All projects extend a base project with the usual info defined (developers names etc.). This
single inheritance forces me to duplicate the common dependency declarations in each subproject.

Ideally I would like an include tag in the dependencies section.

I have coded a workaround which allows for a space separated list of project files in the
<extend> tag. e.g <extend>../project.xml ../common_dependencies.xml</extend>
The first file would be the parent project and the subsequent files would contain common dependencies.
i.e. inherit from the parent and have dependencies composed from siblings.

I will submit a patch for that functionality as soon as I get away from the corporate firewall.

Please let me know if this sort of functionality has already been planned. TIA.


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