如果我们使用Feign定义了两个接口，但是目标服务是同一个，那么在SpringBoot启动时就会遇到一个问题：

Description:
The bean ‘optimization-user.FeignClientSpecification’, defined in null, could not be registered. A bean with that name has already been defined in null and overriding is disabled.
Action:
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true

解决方案有两个：

1.修改yml配置：spring.main.allow-bean-definition-overriding=true

spring:main:allow-bean-definition-overriding: true

2.在每个Feign的接口中，在注解上加 contextId属性

contextId在Feign Client的作用是在注册Feign Client Configuration的时候需要一个名称，名称是通过getClientName方法获取的

@FeignClient(name = "sale-service",contextId= "saleservice1")public interface saleClient{@RequestMapping(value = "/sale/add", method = RequestMethod.GET)String add(@RequestParam("saleNum") String queryStr);}