CrazyHZM commented on code in PR #2042:
URL: https://github.com/apache/maven/pull/2042#discussion_r1913284064


##########
impl/maven-cli/src/main/java/org/apache/maven/cling/logging/impl/MavenSimpleConfiguration.java:
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@@ -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:
   For example, we run the command  `mvn clean install -Dorg 
slf4j.SimpleLogger.DefaultLogLevel -X`, it will lead to effective `-X`, and 
`-Dorgslf4j.SimpleLogger.DefaultLogLevel` failure (I think I said against the 
above)



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