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

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

Michael Osipov created MNG-7556:
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             Summary: 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
             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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