一次服务器CPU占用100%的问题排查

@Component
public class TestComponent {

    @Autowired
    private UserService userService;

    @PostConstruct
    public void init() {
        new Thread(()->{
            while (true) {
                if ( userService.getUser() !=null) {
                    // do something 
                }
            }
        }).start();
    }
}