frankvicky commented on code in PR #17373:
URL: https://github.com/apache/kafka/pull/17373#discussion_r1812297584


##########
connect/runtime/src/test/java/org/apache/kafka/connect/runtime/LoggersTest.java:
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@@ -166,25 +175,32 @@ public void testSetLevel() {
 
     @Test
     public void testSetRootLevel() {
-        Logger root = logger("root");
-        root.setLevel(Level.ERROR);
-
-        Logger p = logger("a.b.c.p");
-        Logger x = logger("a.b.c.p.X");
-        Logger y = logger("a.b.c.p.Y");
-        Logger z = logger("a.b.c.p.Z");
-        Logger w = logger("a.b.c.s.W");
-        x.setLevel(Level.INFO);
-        y.setLevel(Level.INFO);
-        z.setLevel(Level.INFO);
-        w.setLevel(Level.INFO);
+        LoggerContext loggerContext = (LoggerContext) 
LogManager.getContext(false);
+        Configuration config = loggerContext.getConfiguration();
+        LoggerConfig rootConfig = new LoggerConfig("", Level.ERROR, false);
+        config.addLogger("", rootConfig);
+        loggerContext.updateLoggers();
+
+        Logger root = LogManager.getLogger("");

Review Comment:
   In this test case, we focus on setting the level for the root logger. IMHO, 
it would be ideal if we could have a "clean" configuration to conduct this test 
case. If I understand correctly, we can create a new configuration 
programmatically at the beginning in this way to ensure that the test case is 
not affected by existing Log4j configurations.



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