Spring multithreading

I have a question regarding the thread-safety. For example: I have RestController with two endpoints :

@RestController
class MyController {

    @Autowired
    MyService service;

    @GetMapping
    public void add(int i) {
        service.add(i);
    }

    @GetMapping
    public void delete(int i) {
        service.delete(i);
    }
}

@Component
class MyService {
    
    private List<Integer> list;
    
    public void add(int i) {
        list.add(i);
    }

    public void delete(int i) {
        list.remove(i);
    }
}

As I understand, because MyService has scope singleton, his local variable list will share between threads and not thread-safety? If yes, what are the best practices to resolve this issue?