code: public static void logExceptionsAfterExecute(Runnable r, Throwable t)
      {
          Throwable hiddenThrowable = extractThrowable(r);
          if (hiddenThrowable != null)
              handleOrLog(hiddenThrowable);
  
          // ThreadPoolExecutor will re-throw exceptions thrown by its Task (which will be seen by
          // the default uncaught exception handler) so we only need to do anything if that handler
          // isn't set up yet.
          if (t != null && Thread.getDefaultUncaughtExceptionHandler() == null)
              handleOrLog(t);
      }
docs: Send @param t and any exception wrapped by @param r to the default uncaught exception handler,
  or log them if none such is set up