chia7712 commented on code in PR #18394:
URL: https://github.com/apache/kafka/pull/18394#discussion_r1959192770


##########
core/src/main/scala/kafka/docker/KafkaDockerWrapper.scala:
##########
@@ -219,6 +231,68 @@ object KafkaDockerWrapper extends Logging {
     Files.write(filepath, properties.getBytes(StandardCharsets.UTF_8), mode)
   }
 
+  private def addToYaml(loggerFromEnv: Array[Logger], rootOption: 
Option[Root], filepath: Path): Unit = {
+    val path = filepath
+    if (!Files.exists(path)) {
+      Files.createFile(path)
+    }
+
+    val mapper = new ObjectMapper(new 
YAMLFactory().disable(Feature.WRITE_DOC_START_MARKER))
+      .configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, 
true)
+      .setSerializationInclusion(JsonInclude.Include.NON_EMPTY)
+      .findAndRegisterModules();
+
+    val yaml = try {
+      mapper.readValue(filepath.toFile, classOf[Log4jConfiguration])
+    } catch {
+      case _: MismatchedInputException => new Log4jConfiguration
+      case e: RuntimeException => throw e
+    }
+    val config = yaml.getConfiguration
+
+    if (config == null && loggerFromEnv.isEmpty && rootOption.isEmpty) {

Review Comment:
   we should remove this condition. otherwise, the script used by docker can't 
see the output log4j2 config ...



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