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From "Lonnie Pryor (JIRA)" <j...@apache.org>
Subject [jira] Created: (FELIXM2-5) Enable support for inter-bundle transitive dependencies
Date Thu, 23 Mar 2006 01:41:02 GMT
Enable support for inter-bundle transitive dependencies
-------------------------------------------------------

         Key: FELIXM2-5
         URL: http://issues.apache.org/jira/browse/FELIXM2-5
     Project: Felix M2 Plugin
        Type: New Feature
    Versions: 0.1.2, 0.1.3    
 Environment: Multi-bundle build environemnt
    Reporter: Lonnie Pryor
 Assigned to: Timothy Bennett 
    Priority: Minor


The OSGi R4 specification supports transitive dependencies via the "visibility:=reexport"
directive on the "Require-Bundle" manifest header (see OSGi Service Platform Core Specification,
Release 4, Chapter 3, Section 13). Unfortunately, the Felix M2 Plugin does not support declaring
this kind of relationship in the POM.

By only using the dependency scope setting, developers can declare that a specific dependency
is not to be embedded in the bundle, but that dependency is then never transitively passed
on to other projects. It would be optimal if the Maven transitive dependency mechanism could
be configured to mirror the one provided by OSGi.

Since the OsgiJarMojo class only embeds dependencies with the "jar" type, a transitive, non-embedded
dependency can be declared by giving it a type of "osgi-bundle". There are, however, a couple
of issues with this approach:

1.) The ArtifactHandler implementation configured in META-INF/plexus/components.xml specifies
"includesDependencies" as true. This makes any dependencies inherited through an "osgi-bundle"
typed dependency unavailable to other phases of the build life cycle. Setting "includesDependencies"
to false will resolve this issue. While this change will create more overhead during bundle
builds (a bundle dependency and all of its embedded dependencies will be downloaded separately),
this is required if any of the transitive dependencies are needed on the compile or test class
paths.

2.) The OsgiJarMojo class currently embeds any dependency with the type "jar" that is on the
runtime or compile scope. With transitive dependencies as described above enabled, all jars
embedded in bundle dependencies will also be embedded in the dependent bundle. To resolve
this, the OsgiJarMojo class should be changed to only embed dependencies with the type "jar",
on the runtime or compile scope, and not inherited from a dependency with the "osgi-bundle"
type. The latter can be accomplished by analyzing the the contents of the getDependencyTrail()
method for each candidate "jar" artifact.

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