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https://issues.apache.org/jira/browse/MNG-7556?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Osipov updated MNG-7556:
--------------------------------
    Description: 
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.

  was:
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.


> 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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