[jira] [Commented] (MNG-7556) Clean up notion between user properties and system properties

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

    [ https://issues.apache.org/jira/browse/MNG-7556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17612431#comment-17612431 ] 

Michael Osipov commented on MNG-7556:
-------------------------------------

[~sjaranowski], this has impact on the changes in Maven Verifier 2.0.0.

> Clean up notion between user properties and system properties
> -------------------------------------------------------------
>
>                 Key: MNG-7556
>                 URL: https://issues.apache.org/jira/browse/MNG-7556
>             Project: Maven
>          Issue Type: Task
>            Reporter: Michael Osipov
>            Assignee: Michael Osipov
>            Priority: Major
>             Fix For: 3.9.0-candidate, 4.0.0-alpha-1, 4.0.0
>
>
> For a very long time we have documented that the user can set system properties via {{mvn -Dfoo=bar}}, but actually those are user properties which are promoted to system properties and it some cases system properties cannot be modified **after* the JVM has been started. To properly set system properties there are basically two ways:
> * use {{MAVEN_OPTS}} environment variable
> * use {{.mvn/jvm.config}} file
> A third option in the future we could introduce, like other Java tools, a {{-J-Dfoo=bar}} option with the restriction of the the paragraph above.



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