Question

我在项目中使用的是Spring-boot的较新版本，因此，我使用的是getOne（Long id）（而不是findById（Long id））（可选的findById对我不起作用）。我的“保存新表单”方法可以正常工作，并且SQL数据库为提交的表单（也称为代理）创建了一个ID。但是，在编辑表单时，我无法访问现有的ID，并且收到空错误。有人可以在这里向我指出正确的方向。是因为我正在使用getOne方法使它返回null，还是导致此问题的其他原因？

这是跟踪堆栈，显示具有空ID的500错误。

2019-03-08 14:58:32.416 DEBUG 988 --- [p-nio-64-exec-1] o.s.web.servlet.DispatcherServlet        : "ERROR" dispatch for POST "/error", parameters={masked}
2019-03-08 14:58:32.417 DEBUG 988 --- [p-nio-64-exec-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped to public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2019-03-08 14:58:32.418 DEBUG 988 --- [p-nio-64-exec-1] o.s.w.s.m.m.a.HttpEntityMethodProcessor  : Using 'application/json', given [*/*] and supported [application/json, application/*+json, application/json, application/*+json]
2019-03-08 14:58:32.418 DEBUG 988 --- [p-nio-64-exec-1] o.s.w.s.m.m.a.HttpEntityMethodProcessor  : Writing [{timestamp=Fri Mar 08 14:58:32 PST 2019, status=500, error=Internal Server Error, message=The given id must not be null!; nested exception is java.lang.IllegalArgumentException: The given id must not be null!, path=/saveBroker}]
2019-03-08 14:58:32.419 DEBUG 988 --- [p-nio-64-exec-1] o.s.web.servlet.DispatcherServlet        : Exiting from "ERROR" dispatch, status 500

这是我的控制器功能：

 @RequestMapping(value="/newBroker")
    public String newBroker(Model model){
        model.addAttribute("broker",new Broker());
        return "brokerProfile";
    }

    @RequestMapping(value="/addBroker")
    public String addBroker(Model model, @ModelAttribute(value="broker") Broker broker)
    {
        Long id=null;
        try{
            Broker newBroker = brokerRepository.save(broker);
            id = newBroker.getId();
            if (broker.getStatus().equals("active"))
                broker.setOnboardedDate(LocalDate.now());
            brokerRepository.save(newBroker);
        }catch (DataAccessException e){
            e.printStackTrace();
        }

        return "redirect:/edit/"+id;
    }

    @RequestMapping(value="/edit/{id}")
    public String editbroker(Model model, @PathVariable("id") Long id, Broker broker){
        Broker existing= brokerRepository.getOne(id);
        model.addAttribute("broker",existing);
        return "brokerProfile";
    }


    @RequestMapping(value="/saveBroker")
    @ResponseBody
    public JSONObject saveBroker(Model model, @ModelAttribute(value="broker") Broker broker)
    {
        Boolean saved=false;
        JSONObject response=new JSONObject();
        Broker brokerBeforeUpdate = brokerRepository.getOne(broker.getId());

        if (brokerBeforeUpdate!=null && !brokerBeforeUpdate.getStatus().equals("active") && broker.getStatus().equals("active"))
            broker.setOnboardedDate(LocalDate.now());
        else if (!broker.getStatus().equals("active"))
            broker.setOnboardedDate(null);
            try{
                brokerBeforeUpdate=brokerRepository.save(broker);
                saved=true;
                response.put("brokerId",broker.getId());

            }catch (DataAccessException e) {
                e.printStackTrace();
                response.put("error",e.getLocalizedMessage());
                response.put("cause",e.getLocalizedMessage());
            }
        response.put("success",saved);
        return response;
    }
}

我的存储库保留为getOne（）/ findById

public interface BrokerRepository extends CrudRepository<Broker,Long>, JpaSpecificationExecutor {

    Broker save(Broker entity);

//    <Optional>Broker findById(Long id);

    Broker getOne(Long id);


    void delete(Broker entity);

    List<Broker> findAll();

}

经纪人。与ID有关的Java片段

@Entity
@Table(name="Broker")
public class Broker {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "brokerId")
    private Long id;

        public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

}

Answer 1

我认为您需要指定@RequestMethod中使用的方法，因为它没有默认值

@RequestMapping(path="/",method=RequestMethod.GET or POST)

但是您使用它代替@RequestMethod

@PostMethod(path='/')
@GetMethod(path='/')

Spring getOne（id）问题-现有ID为空

1 个答案: