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http://jira.codehaus.org/browse/MNG-2548?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=204472#action_204472
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Jason van Zyl commented on MNG-2548:
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Duplicate dependencies are called out as errors.
> Duplicate dependencies with different scope causes confusion
> ------------------------------------------------------------
>
> Key: MNG-2548
> URL: http://jira.codehaus.org/browse/MNG-2548
> Project: Maven 2 & 3
> Issue Type: Bug
> Components: Dependencies
> Affects Versions: 2.0.4
> Environment: Win XP
> Reporter: Andre Ranvik
> Priority: Minor
> Fix For: 3.0-alpha-6
>
>
> When having duplicate dependencies, where one has a scope of compile, and
> another has a scope of runtime, Maven 2 will use the last scope (I think),
> and if this is the runtime, then the compile dependency is ignored. This can
> be confusing because there *is* a compile dependency provided in the pom, and
> if anything - both dependencies should be in use (meaning: compile, since it
> also includes runtime). An even better approach would be to halt the
> operation with a nice, sweet error message explaining the problem. I can't
> see any reason why one would want to have two dependencies, so it is better
> to ask the user to fix it, as opposed to having some kind of default
> behavior..?
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