slawekjaranowski commented on code in PR #1595:
URL: https://github.com/apache/maven/pull/1595#discussion_r1720809505


##########
maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java:
##########
@@ -1624,20 +1635,65 @@ static void populateProperties(
         String mavenBuildVersion = 
CLIReportingUtils.createMavenVersionString(buildProperties);
         systemProperties.setProperty("maven.build.version", mavenBuildVersion);
 
-        BasicInterpolator interpolator =
-                createInterpolator(paths, systemProperties, userProperties, 
userSpecifiedProperties);
-        for (Map.Entry<Object, Object> e : userSpecifiedProperties.entrySet()) 
{
-            String name = (String) e.getKey();
-            String value = interpolator.interpolate((String) e.getValue());
-            userProperties.setProperty(name, value);
-            // 
----------------------------------------------------------------------
-            // I'm leaving the setting of system properties here as not to 
break
-            // the SystemPropertyProfileActivator. This won't harm embedding. 
jvz.
-            // 
----------------------------------------------------------------------
-            if (System.getProperty(name) == null) {
-                System.setProperty(name, value);
-            }
+        // 
----------------------------------------------------------------------
+        // Options that are set on the command line become system properties
+        // and therefore are set in the session properties. System properties
+        // are most dominant.
+        // 
----------------------------------------------------------------------
+
+        Properties userSpecifiedProperties =
+                
commandLine.getOptionProperties(String.valueOf(CLIManager.SET_USER_PROPERTY));
+        userProperties.putAll(userSpecifiedProperties);
+
+        // 
----------------------------------------------------------------------
+        // Load config files
+        // 
----------------------------------------------------------------------
+        Function<String, String> callback =
+                or(paths::getProperty, prefix("cli.", 
commandLine::getOptionValue), systemProperties::getProperty);

Review Comment:
   it is necessary



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