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https://issues.apache.org/jira/browse/MNG-7222?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17653179#comment-17653179
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Michael Osipov commented on MNG-7222:
-------------------------------------

I have been working in some properties related improvement recently. Which 
dominant/recessive sources should be evaluted to override properties? 
* Model properties overwrite system properties?
* User properties overwriting system properties?

I think enumeration of combos is complete.

> Validate and warn for naming collisions between Maven and System properties
> ---------------------------------------------------------------------------
>
>                 Key: MNG-7222
>                 URL: https://issues.apache.org/jira/browse/MNG-7222
>             Project: Maven
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Konrad Windszus
>            Priority: Major
>
> As properties referenced via {{${x}}} are first being resolved against system 
> properties and only afterwards against Maven properties according to 
> https://maven.apache.org/pom.html#properties. As this is often not noticed  
> such collisions should be detected by Maven and lead to a WARN.
> An example for such a collision can be seen at 
> https://github.com/adobe/aem-core-wcm-components/blob/6a294b0483c711a0283474f962a4643234e47c6e/parent/pom.xml#L64
>  which is never effective as this is always overridden by 
> https://docs.oracle.com/javase/tutorial/essential/environment/sysprop.html
> At least the mandatory properties (available on all JREs) outlined at 
> https://docs.oracle.com/javase/8/docs/api/java/lang/System.html#getProperties--
>  should always lead to a WARN.



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