openFeign调用问题：required a bean of type 'xxx' that could not be found.

场景：

服务B是一个公共的服务，打包成jar后给其他服务使用

package com.testB.seviceB.remote;
//服务B中定义的feign接口
@FeignClient(value = "service-c", path = "/service-c")
public interface ServiceBClient {
    xxxx
}

服务A中引用服务B中定义的Feign接口

package com.testA.serviceA.service;
@Service
public class CallServcieB {
    //引用服务B中的Feign接口
    @Autowired
    private ServiceBClient serviceBClient;
​
}

启动服务A 是报错：声明的 ServiceBClient 找不到

2024-07-19 17:39:58.008 ERROR 47544 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 
​
***************************
​
APPLICATION FAILED TO START
​
***************************
​
Description:
​
Field serviceBClient in com.testA.serviceA.service.CallServcieB required a bean of type 'com.testB.seviceB.remote.ServiceBClient' that could not be found.
​
The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Autowired(required=true)
​
​
Action:
​
Consider defining a bean of type 'com.testB.seviceB.remote.ServiceBClient' in your configuration.

报错原因： 

上面的报错是因为，启动类中Feign默认扫描的是当前服务A的包，需要将引用的服务B的类所在包的路径，也加入Feign的扫描路径中

解决：

修改启动类上Feign的扫描路径，将服务B的中的Feign路径加进来，这样就可以识别到引入的服务B的接口了。

com.testA.serviceA 是服务A的路径

com.testB.seviceB.remote  是服务B的Feign接口路径

package com.testA.serviceA;
​
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
​
@EnableDiscoveryClient
//加入引用的包路径
@EnableFeignClients(basePackages = {"com.testA.serviceA", "com.testB.seviceB.remote"})
@SpringBootApplication
public class ServiceAApplication {
​
    public static void main(String[] args) {
        SpringApplication.run(ServiceAApplication.class, args);
    }
​
}