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https://issues.apache.org/jira/browse/MNG-7852?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Sitnikov updated MNG-7852:
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Summary: Use all the versions for dependency resolution rather than
"nearest first" or "declared first" (was: Use all the versions for dependency
resolution rather than "the first ones")
> Use all the versions for dependency resolution rather than "nearest first" or
> "declared first"
> ----------------------------------------------------------------------------------------------
>
> Key: MNG-7852
> URL: https://issues.apache.org/jira/browse/MNG-7852
> Project: Maven
> Issue Type: Improvement
> Components: Dependencies
> Reporter: Vladimir Sitnikov
> Priority: Major
>
> Currently, Maven uses "nearest first", "declared first" rules for conflict
> resolution:
> https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html
> I suggest those rules are removed since they produce hard to reason
> resolutions for transitive dependencies.
> Here are some examples:
> 1) "Nearest first". Even though the rule sounds easy, it is not something the
> users can control. For instance, if the project does not use Guava library,
> some of the transitive dependencies could add a dependency on Guava. The user
> has no control which dependency would be "the nearest" to declare Guava, so
> user has literally no way to tell which Guava version will be used.
> The only workaround I see for the users is to declare Guava dependency
> explicitly even though the project does not need it directly. It sounds like
> Maven requires users to re-declare all the possible dependencies, including
> the runtime-only ones.
> 2) "declared first". Of course, dependency order matters for classpath order,
> however, it is not predictable in practice, and it might result in
> downgrading dependencies. Imagine the project does not use Guice. However,
> transitive dependencies might use Guice. At the same time, they might start
> using Guice and stop using Guice, so the user can never tell which will be
> the first project that uses Guice. Unfortunately, in Maven, the first project
> that declares dependency wins, so it might easily be the case that the first
> mention of Guice will reference outdated version that would be incompatible
> with the newer one required in another dependency.
> 3) Here's a real-life case: Maven downgrades protobuf-java dependency causing
> something like NoSuchMethodError at the runtime. The steps to reproduce is to
> add dependency on dev.sigstore:sigstore-java:0.4.0. See [~hboutemy] analysis
> in https://github.com/hboutemy/sigstore-maven-plugin/blob/import/analysis.md
> Long story short, sigstore-java does not depend on protobuf-java directly,
> however, sigstore-java depends on several third-party libraries that
> eventually depend on protobuf-java. Maven's "the first wins" behaviour
> results in incoherent set of protobuf dependencies on the classpath.
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