[GitHub] [maven-mvnd] oehme commented on pull request #764: Fix core export provider

[GitBox <gi...@apache.org>]

oehme commented on PR #764:
URL: https://github.com/apache/maven-mvnd/pull/764#issuecomment-1372212690

   The underlying reason why the default logic doesn't work is because the [discovery method](https://github.com/apache/maven/blob/fc2d94f0777998000f7b886d45efb88c28fc09cd/maven-core/src/main/java/org/apache/maven/extension/internal/CoreExtensionEntry.java#L83) calls [ClassRealm.loadResourcesFromImport](https://github.com/codehaus-plexus/plexus-classworlds/blob/master/src/main/java/org/codehaus/plexus/classworlds/realm/ClassRealm.java#L526), which does not handle `META-INF` entries from imported realms. It looks up the name `META-INF/maven/extension.xml` and matches that against the import realms. The[ matching logic](https://github.com/codehaus-plexus/plexus-classworlds/blob/b17db1eae685abd72e2f2f0aad5a40c3bc09fd15/src/main/java/org/codehaus/plexus/classworlds/realm/Entry.java#L71) only accounts for classes/resources in packages, but doesn't account for META-INF. So it never never finds the extension.xml entries.
   
   maven-embedder has the [same problem](https://github.com/apache/maven/blob/master/maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java#L594) now.


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