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http://jira.codehaus.org/browse/MDEP-245?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=202391#action_202391
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Mirko Friedenhagen commented on MDEP-245:
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Just a link to the discussion:
http://old.nabble.com/Maven-Plugin-to-detect-duplicate-class-files-in-a-e.g.-WAR-ts26658458.html
> goal to check classpath for duplicate resources/classes
> -------------------------------------------------------
>
> Key: MDEP-245
> URL: http://jira.codehaus.org/browse/MDEP-245
> Project: Maven 2.x Dependency Plugin
> Issue Type: New Feature
> Reporter: Joerg Schaible
> Assignee: Brian Fox
> Priority: Minor
>
> The classpath sometimes contains unintended duplicate resources and classes
> e.g.:
> # an artifact is present in two different versions at the same time, because
> it changed its groupId or artifactId, but no relocation POM has been provided
> by the artifact's author
> # an artifact has been split into several artifacts (avalon-famework =>
> avalon-framework-api and avalon-framework-impl)
> # an artifact has a collection of "foreign" classes (CGLIB 2.x contains stuff
> from ASM 1.5)
> A new goal of the dependency plugin might detect such cases. Obviously there
> are cases, when this is expected (stax-api implements stuff provided also by
> JDK 6) or cannot be avoided in general (even xpp3_min contains two classes
> from xmlpull-api) or is even part of the spec (SPI files in
> META-INF/services).
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