code: private void processInitialization() {
          ExecutorService executorService = Executors.newFixedThreadPool(this.maxThread);
          this.postInitializingMethods.entrySet().stream().sorted(Comparator.comparing(Map.Entry::getKey)).forEach(entry -> {
              log.debug("Found {} beans with max threads {} and order {}", entry.getValue().size(), this.maxThread, entry.getKey());
              try {
                  executorService.invokeAll(entry.getValue());
              } catch (InterruptedException e) {
                  log.warn("Failed to invoke {} method(s) on executorService {}", entry.getValue().size(), executorService);
              }
          });
          executorService.shutdown();
      }
docs: Launch the initialization of eligible beans
  
  @since 1.0.2