Feign Client 编译失败，它把 BindingResult 作为第二个 Body 参数 [英] Feign Client fails to compile, it treats BindingResult as a second Body parameter

问题描述

我正在学习使用 Spring 的 Feign Client，所以我构建了两个简单的项目(serviceA 和 serviceB)来测试它.我有以下代码:

I'm learning to use Spring's Feign Client, so I've built two simple projects (serviceA and serviceB) to test it out. I have the following code:

serviceA 休息接口:

serviceA rest interface:

@RequestMapping("/users")
public interface UserRest {
    @PostMapping
    public ResponseEntity<User> createUser(@Valid @RequestBody User user, BindingResult br);
}

serviceA REST 接口实现:

serviceA rest interface implementation:

@RestController
public class UserController implements UserRest {
    @Override
    @PostMapping
    public ResponseEntity<User> createUser(@Valid @RequestBody User user, BindingResult br) {
        // validate user
        // persist user
        return ResponseEntity.ok(user);
    }
}

serviceA feign client 声明:

serviceA feign client declaration:

@FeignClient(value = "serviceA", decode404 = true)
public interface UserFeignClient extends UserRest {}

现在，当我将 UserFeignClient 的实例自动装配到我的 serviceB 中时，当我的 REST 方法采用单个参数时，我可以很好地使用它.但是，当我尝试使用上述 BindingResult 验证参数时，出现以下异常:

Now when I autowire an instance of UserFeignClient into my serviceB, I can use it just fine when my REST methods take a single parameter. However, when I then try to validate the parameter using BindingResult like above, I get the following exception:

java.lang.IllegalStateException: Method has too many Body parameters: public abstract org.springframework.http.ResponseEntity com.mypackage.servicea.api.UserRest.createUser(org.apache.catalina.User,org.springframework.validation.BindingResult)

为什么 Feign 认为 BindingResult 是第二个 Body 实体?有什么办法可以解决这个问题吗?

Why does Feign think the BindingResult is a second Body entity? Is there any way to fix this?

推荐答案

一般认为

public ResponseEntity createUser(@Valid @RequestBody User user,绑定结果 br);

public ResponseEntity createUser(@Valid @RequestBody User user, BindingResult br);

作为

public ResponseEntity createUser(@Valid @RequestBody 用户用户，@RequestBody BindingResult br);

public ResponseEntity createUser(@Valid @RequestBody User user, @RequestBody BindingResult br);

OpenFeign 不接受两个 @RequestBody.

OpenFeign doesn’t accept two @RequestBody.

您可以在 feing/Contract.java 文件.

最好的办法是将 Feign 客户端与界面分离.

The best thing is to separate the Feign client from the interface.

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