使用openfeign服务调用时报错：

For 'mall-coupon' URL not provided. Will try picking an instance via load-balancing.

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'umsMemberController': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'com.biienu.mallshop.member.feign.CouponAll': Unexpected exception during bean creation; nested exception is java.lang.IllegalStateException: No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalancer?

原因：最新版OpenFeign不包含LoadBalancer

解决：

pom文件加入LoadBalancer依赖:

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-loadbalancer</artifactId>
    <version>3.1.1</version>
</dependency>