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https://issues.apache.org/jira/browse/MNG-7556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17613974#comment-17613974
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ASF GitHub Bot commented on MNG-7556:
-------------------------------------

michael-o commented on code in PR #810:
URL: https://github.com/apache/maven/pull/810#discussion_r989865835


##########
maven-core/src/main/java/org/apache/maven/internal/aether/DefaultRepositorySystemSessionFactory.java:
##########
@@ -288,14 +289,15 @@ else if ( !MAVEN_RESOLVER_TRANSPORT_AUTO.equals( 
transport ) )
                     + MAVEN_RESOLVER_TRANSPORT_NATIVE + ", " + 
MAVEN_RESOLVER_TRANSPORT_AUTO );
         }
 
-        session.setTransferListener( request.getTransferListener() );
-
-        session.setRepositoryListener( eventSpyDispatcher.chainListener( new 
LoggingRepositoryListener( logger ) ) );
-
+        // TODO This duplicates 
org.apache.maven.repository.internal.MavenRepositorySystemUtils.newSession()

Review Comment:
   @gnodet pushed a potential cleanup in 
ee91544d7e2ff4bdf96075e12da3a1d1abd10d28. In fact, the previous approach did 
even ignore env vars, FWIW.





> 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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