Get optional transitive dependencies
------------------------------------
Key: MNG-2966
URL: http://jira.codehaus.org/browse/MNG-2966
Project: Maven 2
Issue Type: Improvement
Components: Dependencies
Reporter: Daniel Beland
I would like to be able to add an includes statement on a dependency to get its
optional dependency(ies).
ie:
<dependency>
<groupId>hibernate</groupId>
<artifactId>hibernate</artifactId>
<version>3.2.1.ga</version>
<inclusions>
<inclusion>
<groupId>jgroups</groupId>
<artifactId>jgroups-all</artifactId>
<scope>runtime</scope>
<optional>false</optional>
</inclusion>
</inclusions>
</dependency>
For example, I use hibernate 3.2.1.ga, it has an optional dependency on
jgroups-all-2.2.8.
I would like to be able to add an inclusion statement on the hibernate lib to
tell that I want to include jgroups as well.
The main reason for this is that I want the same version as specified in the
hibernate pom.
This way, upgrading hibernate would also upgrade my version of jgroups at the
same time.
Obviously, we need to be able to define a scope and optional attribute as well
(not inherited)
Or maybe we could set the dependency explicitly in the pom without specifying
the version and have maven resolve the version from the nearest source (as it
does normally) automatically or we specify where to resolve it.
ie something like:
<dependency>
<groupId>jgroups</groupId>
<artifactId>jgroups-all</artifactId>
<! -- either maven resolves the version from the nearest source
automatically or we need to tell maven where to find it -->
<versionLookup>
<groupId>hibernate</groupId>
<artifactId>hibernate</artifactId>
<!-- maven will resolve the version from the hibernate pom as long as
hibernate is already a dependency of my project (no version needed)
or we specify which version from a property (to have it defined
only once in the pom) -->
<version>${hibernate.version}</version>
</versionLookup>
<scope>runtime</scope>
<optional>false</optional>
</dependency>
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