ControllerService {
  LinkedBlockingQueue<String> queue;
  ExecutorService workers;

  @PostConstruct
  public void init() {
    queue = new LinkedBlockingQueue<>();
    workers = Executors.newFixedThreadPool(10);

    Executors.singleThreadedExecutor().execute(() -> {
      while(true) {
        workers.execute(() -> someAction(queue.take()));
      }
    })
  }

  public void method1(String name) {
    // some actions
    queue.put(name);
    // some actions
  }
}

Controller {
  ControllerService controllerService;

  @PostMapping("/api1")
  public ResponseEntity<String> api1(@PathVariable String name) {
    controllerService.method1(name);
    return ResponseEntity.of("success");
  }
}

问题是 someAction 完成需要5-15秒。还有api /api1 在几毫秒内完成。这里发生的事情有时是 workers 调用线程（负责服务器api调用的线程）返回responseentity并结束后，线程立即挂起。
关于为什么会发生这种情况，有什么线索或解释吗？