SpringCloud微服务（Fegin负载均衡遇到的问题和解决方案）

Completed shut down of DiscoveryClient

You already have RibbonLoadBalancerClient on your classpath. It will be used by default. As Spring Cloud Ribbon is in maintenance mode. We recommend switching to BlockingLoadBalancerClient instead. In order to use it, set the value of `spring.cloud.loadbalancer.ribbon.enabled` to `false` or remove spring-cloud-starter-netflix-ribbon from your project.

原因：缺少web依赖

<dependency>

   <groupId>org.springframework.boot</groupId>

   <artifactId>spring-boot-starter-web</artifactId>

</dependency>

负载均衡失败

2020-08-11 14:37:20.331 ERROR 17764 --- [nio-8083-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is feign.codec.DecodeException: Could not extract response: no suitable HttpMessageConverter found for response type [java.util.List<java.lang.Object>] and content type [text/plain;charset=UTF-8]] with root cause

原因：编写逻辑代码返回类型未对应

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