我正计划处理一些交易数据，并请求检索一些我希望存储在mysql中的市场数据。
从昨天起，我就被困在一个 NullPointerException 在我的密码里。在stackoverflow上，我经常看到尝试示例化服务的错误，例如忘记注解。
对我来说，每当我尝试使用自动连线服务时，它似乎都会出错。我现在从main方法调用这个方法（在控制器中发出数据请求）。这意味着我必须示例化才能到达那里。这可能就是问题所在。我可能缺少如何正确处理这个问题或如何将数据保存到dao的概念。希望有人能把我引向正确的方向。
请参见下面的代码：

@SpringBootApplication
public class DesktopAutoTradingApplication {

    public static void main(String[] args) throws JsonProcessingException {

        SpringApplication.run(DesktopAutoTradingApplication.class, args);
        MarketsBinanceController marketsBinanceController = new MarketsBinanceController();
        marketsBinanceController.saveListOfMarketsBinance();
    }

@Controller
public class MarketsBinanceController{

    @Autowired
    RequestServices requestService;

    public void saveListOfMarketsBinance() throws JsonProcessingException {
        String resourceURL;
        RestTemplate restTemplate = new RestTemplate();
        ObjectMapper mapper = new ObjectMapper();
        ResponseEntity<String> response;
        MarketsBinance marketsBinance;

        resourceURL = "https://api.cryptowat.ch/markets/binance";
        response = restTemplate.getForEntity(resourceURL, String.class);
        JsonNode root = mapper.readTree(response.getBody());
        JsonNode result = root.get("result");
        System.out.println(result);
        List<MarketsBinance> markets = new ArrayList<>();
        for(JsonNode item : result){
            marketsBinance = new MarketsBinance();
            MarketsBinanceDto marketsBinanceDto;
            marketsBinanceDto = mapper.treeToValue(item,MarketsBinanceDto.class);
            marketsBinance.setId(marketsBinanceDto.getId());
            marketsBinance.setExchange(marketsBinanceDto.getExchange());
            marketsBinance.setPair(marketsBinanceDto.getPair());
            marketsBinance.setActive(marketsBinanceDto.getActive());
            marketsBinance.setRoute(marketsBinanceDto.getRoute());
            markets.add(marketsBinance);
            requestService.saveMarketsBinance(markets);
        }
    }
}

@Service
@Transactional
public class RequestServices {

    @Autowired
    private MarketsBinanceDAO marketsBinanceDAO;

    public void saveMarketsBinance(List<MarketsBinance> markets){
        marketsBinanceDAO.saveAll(markets);
    }
}

@Component
public interface MarketsBinanceDAO extends CrudRepository<MarketsBinance, Long> {

}

@Entity
public class MarketsBinance {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long tableId;
    private Long id;
    private String exchange;
    private String pair;
    private Boolean active;
    private String route;

//getters and setters

public class MarketsBinanceDto {

    private Long id;
    private String exchange;
    private String pair;
    private Boolean active;
    private String route;

//getters and setters

Exception in thread "main" java.lang.NullPointerException
    at Controller.MarketsBinanceController.saveListOfMarketsBinance(MarketsBinanceController.java:46)
    at com.DAT.DesktopAutoTrading.DesktopAutoTradingApplication.main(DesktopAutoTradingApplication.java:16)

下面是运行程序时收到的错误消息，在第一个答案中添加了建议的解决方案。

Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'Controller.MarketsBinanceController' available
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:352)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:343)
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1127)
    at com.DAT.DesktopAutoTrading.DesktopAutoTradingApplication.main(DesktopAutoTradingApplication.java:15)
2020-09-07 12:24:03.545  INFO 22756 --- [         task-1] o.h.e.t.j.p.i.JtaPlatformInitiator       : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2020-09-07 12:24:03.553  INFO 22756 --- [         task-1] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'