Child threads of an unmanaged call back thread does not have MDC context and cannot be set neither

[zhihao-talkdesk]

I recently encounter this issue that, I am using SpeechRecognizer of microsoft.cognitiveservices.speech to help me to recognize voice, and the call back thread of it is an unmanaged thread (Thread-xxxxx). I am able to reset MDC context to this thread, however, I am not able to pass to or set MDC for the child threads going foward

code example:

final Map<String, String> contextMdc = MDC.getCopyOfContextMap();
sessionRecognizer.recognizing.addEventListener((s, e) -> {
       // call back runs in a unmanaged thread (Thread-xxx)
          if(contextMap != null) {
                           MDC.setContextMap(contextMap);
                 }
          log.info("MDC Context Map: {}", MDC.getCopyOfContextMap());    // shows MDC map have contents
          postGreClient.preparedQuery(.....)      // a vert.x thread created
                 .thenApply( context -> {
                 if(contextMap != null) {
                           MDC.setContextMap(contextMap);
                 }
                 MDC.put("testKey", "testValue");
                 log.info("child threadMDC Context Map: {}", MDC.getCopyOfContextMap());    // not thing shows for MDC
            });
} 

I also try to used MangedExecutor, still not working

final Map<String, String> contextMdc = MDC.getCopyOfContextMap();
sessionRecognizer.recognizing.addEventListener((s, e) -> {
       // call back runs in a unmanaged thread (Thread-xxx)
          if(contextMap != null) {
                           MDC.setContextMap(contextMap);
                 }
          log.info("MDC Context Map: {}", MDC.getCopyOfContextMap());    // shows MDC map have contents
          postGreClient.preparedQuery(.....)      // a vert.x thread created
                 .thenApplyAsync( context -> {.      //  run in execcutor thread
                 if(contextMap != null) {
                           MDC.setContextMap(contextMap);
                 }
                 MDC.put("testKey", "testValue");
                 log.info("child threadMDC Context Map: {}", MDC.getCopyOfContextMap());    // still not thing shows for MDC
            }, managedExecutor);
} 

I have also tried wrap the code block in
vertx.runOnContext
or threadContext.contextualRunnable suggested by chatgpt. But none of them works
Appreciate for any advice. Thanks!