How to use Async in Spring Boot?

Below is my code.

With my below code, different thread ids are not getting created.

The output has same thread id.

@Controller
@RequestMapping(value = "/Main")
public class MyController 
{
    @Autowired
    private MyService myService;
   
   @PostMapping("/Sub")
   @ResponseBody
   public String readInput(@RequestBody String name)
   {
       for (int i = 0;i<5;i++)
       {
           myService.asyncMethod();
       }
       return "Success";
   }
}

With my below code, different thread ids are not getting created.

@Repository
@Configuration
@EnableAsync
public class MyService {

    @Bean(name = "threadPoolTaskExecutor")
       public Executor threadPoolTaskExecutor() {
          return new ThreadPoolTaskExecutor();
       }
     
     @Async("threadPoolTaskExecutor")
     public void asyncMethod() {
        System.out.println("Thread " + Thread.currentThread().getId()+ " is running");
     }
}

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