[Java知识库]No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalanc

> No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalancer

由于SpringCloud Feign在 Hoxton.M2 RELEASED版本之后不再使用Ribbon而是使用spring-cloud-loadbalancer，所以不引入spring-cloud-loadbalancer会报错，

解决方法 加入spring-cloud-loadbalancer依赖并且在nacos中排除ribbon依赖，不然loadbalancer无效

<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-loadbalancer -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-loadbalancer</artifactId>
            <version>2.2.9.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>com.netflix.ribbon</groupId>
                    <artifactId>ribbon</artifactId>
                </exclusion>
            </exclusions>
        </dependency>