gnodet commented on code in PR #2042:
URL: https://github.com/apache/maven/pull/2042#discussion_r1916014733


##########
impl/maven-cli/src/main/java/org/apache/maven/cling/logging/impl/MavenSimpleConfiguration.java:
##########
@@ -37,7 +40,16 @@ public void setRootLoggerLevel(Level level) {
                     case INFO -> "info";
                     default -> "error";
                 };
-        System.setProperty("org.slf4j.simpleLogger.defaultLogLevel", value);
+
+        String defaultLogLevelKey = "org.slf4j.simpleLogger.defaultLogLevel";
+        String current = System.getProperty(defaultLogLevelKey);
+        if (current == null) {
+            System.setProperty(defaultLogLevelKey, value);
+        } else {

Review Comment:
   The `-X` option will ultimately call 
`MavenSimpleConfiguration#setRootLoggerLevel` which will set the 
`org.slf4j.simpleLogger.defaultLogLevel` system property to the value, see 
https://github.com/apache/maven/blob/99777ace0226034f82299898e598a7f977d525ef/impl/maven-cli/src/main/java/org/apache/maven/cling/logging/impl/MavenSimpleConfiguration.java#L40



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