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https://issues.apache.org/jira/browse/MSHADE-286?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17003368#comment-17003368
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Peter De Maeyer commented on MSHADE-286:
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I'm working on a solution on a branch in my fork.
> Shading fails when a dependency's main artifact does not exist
> --------------------------------------------------------------
>
> Key: MSHADE-286
> URL: https://issues.apache.org/jira/browse/MSHADE-286
> Project: Maven Shade Plugin
> Issue Type: Bug
> Affects Versions: 3.1.0
> Reporter: Peter De Maeyer
> Assignee: Mark Struberg
> Priority: Minor
>
> Shading fails when a dependency's main artifact does not exist, see the
> methods {{ShadeMojo.invalidMainArtifact/createErrorOutput}} and their caller.
> A similar existence check (luckily) does not exist for the other artifacts:
> test jar, sources, and test sources.
> This was done intentionally, but it's overly strict because it prohibits a
> legitimate use case: some projects don't produce a main artifact, but only
> e.g. a test artifact.
> Such projects can't be shaded because of this existence check.
> It would be better to:
> - Get rid of this check, or at least relax it, such that shading also works
> for projects that don't have a main artifact.
> - Complete the symmetry between jar, test jar, sources and test sources by
> adding a {{shadeJar}} boolean with default value {{true}}, which disables
> shading of main artifacts in a similar way {{shadeTestJar}},
> {{createSourcesJar}} and {{createTestSourcesJar}} work. This will allow
> shading to disable creation of a main artifact altogether, even when the
> dependencies _do_ have a main artifact.
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