Hi,
when we start requiring Maven 3.0 for our plugins, IMO they should all
work *without* depending on Maven Compat.
I've tried to do this for the maven-invoker-plugin and hit the first issue.
They all have to do with artifacts: ArtifactInstaller, ArtifactRepository,
ArtifactRepositoryFactory, ArtifactResolver.
The original code doesn't describe what to do, but after some digging I
found this:
https://cwiki.apache.org/confluence/display/MAVEN/Compatibility+with+Maven+2.x
bq.
Maven Artifact
Maven Artifact will be entirely extricated from the core of Maven 3.x and
replaced with Mercury, but we will make a best effort to
ensure the compatibility of plugins that use Maven Artifact. There are,
however, components and classes that are just so broken or conflict
with standard ways of doing resolution and conflict reduction that we
can't support them.
Supported Compatibility
•org.apache.maven.artifact.deployer.ArtifactDeployer
•org.apache.maven.artifact.factory.ArtifactFactory
•org.apache.maven.artifact.handler.ArtifactHandler
•org.apache.maven.artifact.installer.ArtifactInstaller
•org.apache.maven.artifact.manager.WagonManager (1)
•org.apache.maven.artifact.repository.ArtifactRepository
•org.apache.maven.artifact.repository.ArtifactRepositoryPolicy
•org.apache.maven.artifact.repository.ArtifactRepositoryFactory
•org.apache.maven.artifact.repository.layout.ArtifactRepositoryLayout
•org.apache.maven.artifact.resolver.ArtifactResolver
•org.apache.maven.artifact.resolver.filter.ArtifactFilter
•org.apache.maven.artifact.resolver.filter.Artifact
(1) In r746285 various methods have been removed from the WagonManager
which breaks the maven-project-info-reports-plugin, the
maven-site-plugin and the maven-stage-plugin, e.g. due to a linkage
error on getAuthentaticationInfo().
Unsupported Compatibility
•org.apache.maven.artifact.metadata.ArtifactMetadataSource
•org.apache.maven.artifact.metadata.ResolutionGroup
•org.apache.maven.artifact.repository.metadata.*
•org.apache.maven.artifact.resolver.ResolutionNode
•org.apache.maven.artifact.resolver.ResolutionListener
•org.apache.maven.artifact.resolver.metadata.*
•org.apache.maven.artifact.resolver.transform.*
•org.apache.maven.artifact.resolver.versioning.*
Mercury? I guess some of it is now part of Aether, but I think we should
keep the abstraction layer (remember the issues we got Aether moved from
Sonatype to Eclipse and the amount of workarounds).
What to do? Move them back, make new APIs for Maven4, like
ArtifactTransferor?
My first conclusion is that we can't make these plugins Maven3 compatible
without the maven-compat, unless we embed the classes in the plugin.
thanks,
Robert
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