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https://issues.apache.org/jira/browse/MDEP-776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17439221#comment-17439221
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Michael Osipov commented on MDEP-776:
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Yes, this is a general problem when artifact ids collide. One issue with a
warning is that the JAR could be from a previous run and how do you detect
that?!
> copy-dependencies overwrites artifacts of the same artifact id
> --------------------------------------------------------------
>
> Key: MDEP-776
> URL: https://issues.apache.org/jira/browse/MDEP-776
> Project: Maven Dependency Plugin
> Issue Type: Bug
> Components: copy-dependencies
> Affects Versions: 3.1.2, 3.2.0
> Reporter: Nikolaos Georgiou
> Priority: Major
>
> We have a project which has 2 dependencies of different groupId but same
> artifactId and version, e.g. com.acme:foo:1.2.3 and com.ecorp:foo:1.2.3
> We use the copy-dependencies goal of the plugin to copy libraries under
> target/lib folder.
> Actual Result:
> * only one foo.jar survives in the target/lib folder. The other one silently
> gets overwritten. This leads to difficult to diagnose runtime errors, as one
> JAR is missing.
>
> Expected Result:
> * it should at least give a warning, if not an error, that it has
> overwritten an artifact during this process
>
> Known workaround:
> * we activated useRepositoryLayout, which allows both artifacts to survive
> under a directory structure, which complicates a bit our classpath building
> process (from target/lib/* we need to find all the JARs with a bit of bash
> glue)
>
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