[jira] [Commented] (MNG-7563) Java system properties now override user properties in dependencies

["Michael Osipov (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/MNG-7563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17645485#comment-17645485 ] 

Michael Osipov commented on MNG-7563:
-------------------------------------

I ran now your sample and understand its structure. Here is my verdict: The system absolutely behave the way it should be. Your summany and description are plain wrong. What you have in your setup: project b uses a dependecy where the artifact id is interpolated witha property. The default value is provided through a *model* property. When both c and b are installed, you use a *user* property to override the *model* property and this is exactly what the system is supposed to do. User properties take precende over model properties. There are no Java system properties involved.

Please read MNG-7556 and rephrase your request.

> Java system properties now override user properties in dependencies
> -------------------------------------------------------------------
>
>                 Key: MNG-7563
>                 URL: https://issues.apache.org/jira/browse/MNG-7563
>             Project: Maven
>          Issue Type: Bug
>          Components: Dependencies, POM
>    Affects Versions: 3.8.5, 3.8.6
>            Reporter: Hervé Guillemet
>            Assignee: Michael Osipov
>            Priority: Major
>         Attachments: poms.zip
>
>
> An important change has been introduced in 3.8.5 that breaks some existing builds: Java system properties now take precedence over default values of user properties in dependency POMs. This look like a bug since it's now easy to affect dependency behaviors with system properties, a practice that has been discouraged. But maybe do you consider this as a new feature ?
> As an example, 3 poms are attached to this ticket.
> After installing projects b and c, building project a with:
> {{mvn package -Ddep=x}}
> used to succeed until 3.8.4 (-D is ignored) but throws error with 3.8.5 and 3.8.6 (-D override the default).
> Note that without the setting of the default value for property {{dep}} in project b, the build fails with any version of Maven.



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