frankvicky commented on code in PR #17373:
URL: https://github.com/apache/kafka/pull/17373#discussion_r1825368063


##########
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Loggers.java:
##########
@@ -174,43 +175,50 @@ private synchronized List<org.apache.log4j.Logger> 
loggers(String namespace) {
     }
 
     // visible for testing
-    org.apache.log4j.Logger lookupLogger(String logger) {
+    org.apache.logging.log4j.Logger lookupLogger(String logger) {
         return LogManager.getLogger(logger);
     }
 
-    @SuppressWarnings("unchecked")
-    // visible for testing
-    Enumeration<org.apache.log4j.Logger> currentLoggers() {
-        return LogManager.getCurrentLoggers();
+    List<org.apache.logging.log4j.Logger> currentLoggers() {
+        LoggerContext context = (LoggerContext) LogManager.getContext(false);
+        Collection<LoggerConfig> loggerConfigs = 
context.getConfiguration().getLoggers().values();
+        Set<String> loggerNames = loggerConfigs.stream()
+            .map(LoggerConfig::getName)
+            .collect(Collectors.toSet());
+
+        List<org.apache.logging.log4j.Logger> loggers = new ArrayList<>();
+        for (String name : loggerNames) {
+            loggers.add(LogManager.getLogger(name));
+        }
+        return loggers;
     }
 
     // visible for testing
-    org.apache.log4j.Logger rootLogger() {
+    org.apache.logging.log4j.Logger rootLogger() {
         return LogManager.getRootLogger();
     }
 
-    private void setLevel(org.apache.log4j.Logger logger, Level level) {
-        Level currentLevel = logger.getLevel();
-        if (currentLevel == null)
-            currentLevel = logger.getEffectiveLevel();
+    private void setLevel(org.apache.logging.log4j.Logger logger, Level level) 
{
+        String loggerName = logger.getName();
+        LoggerContext context = (LoggerContext) LogManager.getContext(false);
+        LoggerConfig loggerConfig = 
context.getConfiguration().getLoggerConfig(loggerName);
+        Level currentLevel = loggerConfig.getLevel();

Review Comment:
   Hi @ppkarwasz 
   Currently, AK 4.0 release is scheduled at January 29th 2025.
   For further details, you can refer to the release plan:
   https://cwiki.apache.org/confluence/display/KAFKA/Release+Plan+4.0.0
   



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