java - 运行我的 Spring Boot 应用程序时出现 Feign UnsatisfiedDependecyException

Question

我有一些为 Spring Boot 应用程序编写的假客户端

这是我的代码

首先这是一个 Controller ，我在其中使用我的 feign 客户端

package demo.notification;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import demo.shema.Feign.NotifFeignClient;
import demo.shema.dto.NotificationDTO;

@RestController
@RequestMapping(NotificationRestMediator.API)
public class NotificationRestMediator {
    public static final String API ="notif";

    @Autowired
    private NotifFeignClient notifFeignClient;

    @GetMapping
    List<NotificationDTO> getAllNotifications(){
        return notifFeignClient.getAll();
    }
}

那么我的假客户端如下

package demo.shema.Feign;

import java.util.List;

import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestParam;

import demo.shema.dto.NotificationDTO;

@FeignClient("Notification")
public interface NotifFeignClient {

    public static final String NOTIF = "notif";

    @GetMapping(NOTIF)
    List<NotificationDTO> getAll();

    @PutMapping(NOTIF)
    Boolean setNotif(@RequestBody NotificationDTO notif,@RequestParam String principal);

    @PostMapping(NOTIF)
    NotificationDTO createNotif(@RequestBody NotificationDTO notif,@RequestParam String principal);

    @DeleteMapping(NOTIF)
    Boolean deleteNotif(@RequestParam Long notifID,@RequestParam String principal);

}

我的 feign 配置位于主类上，使用注释和另一个配置类，如下所示

@SpringBootApplication
@EnableOAuth2Sso
@EnableEurekaClient
@EnableDiscoveryClient
@EnableFeignClients(basePackageClasses = { AppClientFeign.class })
@RibbonClients({ @RibbonClient(name = "COMPONENTS"), @RibbonClient(name = "USERS-MANAGER") })
@ComponentScan(basePackageClasses = { ClientApplication.class , AppClientFeign.class })

那么类配置是

@Configuration
@EnableFeignClients
@ImportAutoConfiguration({RibbonAutoConfiguration.class, FeignRibbonClientAutoConfiguration.class, FeignAutoConfiguration.class})
public class FeignConfig {

}

那么异常错误详细信息如下

Error creating bean with name 'notificationRestMediator': Unsatisfied dependency expressed through field 'notifFeignClient'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'demo.shema.Feign.NotifFeignClient': FactoryBean threw exception on object creation; nested exception is java.lang.IllegalStateException: RequestParam.value() was empty on parameter 1

要做什么？

Answer 1

这是一个错误 here ，正如你所说，对于最新版本不需要指定值，但对于旧版本需要指定值

@PutMapping(NOTIF)
Boolean setNotif(@RequestBody NotificationDTO notif,@RequestParam("principal") String principal);