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https://issues.apache.org/jira/browse/MNG-7373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17465073#comment-17465073
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Michael Osipov commented on MNG-7373:
-------------------------------------
I think the first problem here is that you did wrong and changed the packaging
type of a plugin from {{maven-plugin}} to {{pom}} which leads to undefined
behavior. The guide is horribly outdated. I think what likely should be done,
independent of the relocation is that if the packaging fo the plugin is not
what expected it should yield a warn/error.
> Maven should not attempt to download the jar when <packaging>pom</packaging>
> ----------------------------------------------------------------------------
>
> Key: MNG-7373
> URL: https://issues.apache.org/jira/browse/MNG-7373
> Project: Maven
> Issue Type: Improvement
> Reporter: S L
> Priority: Major
>
> Hello,
> maybe a corner case of what exactly should be part of a "relocation pom"
> ([https://maven.apache.org/guides/mini/guide-relocation.html]), but I created
> a release just consisting of the relocation-info
> ([https://repo1.maven.org/maven2/pl/project13/maven/git-commit-id-plugin/4.9.9/git-commit-id-plugin-4.9.9.pom])
> as type `<packaging>pom</packaging>` (since I only wanted to publish the
> relocation information).
> Using this depdendency.e.g. via:
> {code}
> <build>
> <plugins>
> <plugin>
> <groupId>pl.project13.maven</groupId>
> <artifactId>git-commit-id-plugin</artifactId>
> <version>4.9.9</version>
> </plugin>
> </plugins>
> </build>
> {code}
> yields in the incorrect attempt of downloading a JAR-File from the new
> repository location:
> {code}
> [INFO] Building Git Commit Id Plugin Maven Mojo Debugging 0.0.3-SNAPSHOT
> [1/3]
> [INFO] --------------------------------[ pom
> ]---------------------------------
> Downloading from central-secure:
> https://repo.maven.apache.org/maven2/io/github/git-commit-id/git-commit-id-maven-plugin/4.9.9/git-commit-id-maven-plugin-4.9.9.pom
> [WARNING] The POM for
> io.github.git-commit-id:git-commit-id-maven-plugin:jar:4.9.9 is missing, no
> dependency information available
> Downloading from central-secure:
> https://repo.maven.apache.org/maven2/io/github/git-commit-id/git-commit-id-maven-plugin/4.9.9/git-commit-id-maven-plugin-4.9.9.jar
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Reactor Summary for Git Commit Id Plugin Maven Mojo Debugging
> 0.0.3-SNAPSHOT:
> [INFO]
> [INFO] Git Commit Id Plugin Maven Mojo Debugging .......... FAILURE [ 0.850
> s]
> [INFO] submodule-one ...................................... SKIPPED
> [INFO] submodule-two ...................................... SKIPPED
> [INFO]
> ------------------------------------------------------------------------
> [INFO] BUILD FAILURE
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Total time: 1.000 s
> [INFO] Finished at: 2021-07-12T21:42:15+02:00
> [INFO]
> ------------------------------------------------------------------------
> [ERROR] Plugin pl.project13.maven:git-commit-id-plugin:4.9.9 or one of its
> dependencies could not be resolved: Could not find artifact
> io.github.git-commit-id:git-commit-id-maven-plugin:jar:4.9.9 in
> central-secure (https://repo.maven.apache.org/maven2) -> [Help 1]
> {code}
> IMHO Maven should not even try to search for a jar when
> `<packaging>pom</packaging>`. Simply raise an error that the package was
> relocated. the new location is at least detected, since it tries to download
> the artifact from a new location.
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