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https://issues.apache.org/jira/browse/MNG-8494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17910442#comment-17910442
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Guillaume Nodet commented on MNG-8494:
--------------------------------------

The {{maven-compat}} is required at runtime when building sites for example.  
Maven itself does not use it.

I once had a goal to remove {{maven-compat}} completely, but that's not on my 
radar anymore.

Here again, I think switching plugins to the new API will solve the problem 
automatically, so not sure it's worth pursuing. I'd rather switch them directly 
to the new Maven API.  Maven 5 should drop Maven 3 compatibility and all 
{{/compat/maven-*}} artifacts imho.  Maven 4 currently keeps some level of 
compatibility with Maven 3 and Maven 2...


> Restore Maven 3 compatibility
> -----------------------------
>
>                 Key: MNG-8494
>                 URL: https://issues.apache.org/jira/browse/MNG-8494
>             Project: Maven
>          Issue Type: Task
>          Components: API
>            Reporter: Guillaume Nodet
>            Priority: Critical
>             Fix For: 4.0.0-rc-3
>
>
> The Maven 3 modules have been moved into the  {{/compat/}} directory.
> But before this happened and the new Maven 4 API was introduced, those 
> classes undergo quite some incompatible changes.  Given they are now 
> deprecated, it would make sense to restore them to full Maven 3.9.x 
> compatibility.



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