Did you forget to include spring-cloud-starter-loadbalancer

问题描述
项目环境
解决方案
- 1、引入eureka依赖——无效
- 2、降低spring cloud版本——无效
- 3、添加ribbon——无效
- 4、加入spring-cloud-loadbalancer并在nacos中排除ribbon依赖——问题解决
参考链接

问题描述

最近在使用最新版本的nacos和feign的过程中，启动时遇到一个错误：

Caused by: java.lang.IllegalStateException: No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalancer?

百思不得其解，之前的spring cloud版本没有遇到这样的问题。花了将近几个小时，终于解决，记录一下，希望能给大家带来一点帮助。

项目环境

项目中的父pom文件版本依赖管理如下：

 <parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.4.4</version></parent><properties><spring-cloud.version>2020.0.2</spring-cloud.version></properties><dependencyManagement><dependencies><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-alibaba-dependencies</artifactId><version>2.2.0.RELEASE</version><type>pom</type><scope>import</scope></dependency><!--spring cloud --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>${spring-cloud.version}</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement>

用的是最新版本的springboot 和springcloud，然后在子项目中，我用到了feign和nacos，依赖如下：

 <dependencies><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-openfeign</artifactId></dependency></dependencies>

解决方案

1、引入eureka依赖——无效

第一时间想到的，spring cloud和springboot版本不兼容。查看spring cloud官网，发现spring boot版本号和spring cloud版本号可以对应：

说明项目是没问题的，就上网查找了一下，结果参考了这两位仁兄说的：

在项目中加入eureka依赖：

<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-eureka-client</artifactId></dependency>

再次启动，报错：

Field autoServiceRegistration in org.springframework.cloud.client.serviceregistry.AutoServiceRegistrationAutoConfiguration required a single bean, but 2 were found:- nacosAutoServiceRegistration: defined by method 'nacosAutoServiceRegistration' in class path resource [com/alibaba/cloud/nacos/registry/NacosServiceRegistryAutoConfiguration.class]- eurekaAutoServiceRegistration: defined by method 'eurekaAutoServiceRegistration' in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration.class]Action:Consider marking one of the beans as @Primary, updating the consumer to accept multiple beans, or using @Qualifier to identify the bean that should be consumed

这是因为项目中已经用到了nacos，再次引入eureka，会造成有两个注册中心的问题，说明这种解决方案无效。

2、降低spring cloud版本——无效

既然之前的版本没问题，那我就降级回去不就完事了，于是乎，我把项目的父pom中spring cloud版本降级到Hoxton SR1，spring boot版本也随之降级到2.2.1，即：

 <parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.2.1.RELEASE</version></parent>
<dependencyManagement><dependencies><dependency><groupId>com.alibaba.cloud</groupId><artifactId>spring-cloud-alibaba-dependencies</artifactId><version>2.2.0.RELEASE</version><type>pom</type><scope>import</scope></dependency><!--spring cloud --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Hoxton.SR1</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement>

maven clean后再次启动，仍然报错：

错误信息：


Caused by: java.lang.IllegalStateException: No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalancer?at org.springframework.cloud.openfeign.FeignClientFactoryBean.loadBalance(FeignClientFactoryBean.java:333) ~[spring-cloud-openfeign-core-3.0.2.jar:3.0.2]at org.springframework.cloud.openfeign.FeignClientFactoryBean.getTarget(FeignClientFactoryBean.java:360) ~[spring-cloud-openfeign-core-3.0.2.jar:3.0.2]at org.springframework.cloud.openfeign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:339) ~[spring-cloud-openfeign-core-3.0.2.jar:3.0.2]at org.springframework.cloud.openfeign.FeignClientsRegistrar.lambda$registerFeignClient$0(FeignClientsRegistrar.java:230) ~[spring-cloud-openfeign-core-3.0.2.jar:3.0.2]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainFromSupplier(AbstractAutowireCapableBeanFactory.java:1231) ~[spring-beans-5.3.5.jar:5.3.5]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1173) ~[spring-beans-5.3.5.jar:5.3.5]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564) ~[spring-beans-5.3.5.jar:5.3.5]at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.5.jar:5.3.5]... 34 common frames omitted

这次的错误信息跟第一次一样，可见降低版本这事已经行不通了，于是我复原了父pom。

3、添加ribbon——无效

在stackoverflow上看到了这两种解决方案：

因为不想在feign上加url，显得比较麻烦，于是我选择了第二种方案，加ribbon并配置了相关属性，启动还是报错：

Caused by: java.lang.IllegalStateException: No Feign Client for loadBalancing defined. Did you forget to include spring-cloud-starter-loadbalancer?

但是其中的第一种方案，我还是有点感兴趣，于是就根据第一种方案中的关键字spring-cloud-loadbalancer，搜索了一下。

4、加入spring-cloud-loadbalancer并在nacos中排除ribbon依赖——问题解决

继续搜索，发现如下结果：

根据这位大佬的说法，这是因为：

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

问题突然有了点头目，于是乎，加入如下依赖：

//我是在这引入了spring-cloud-starter-alibaba-nacos-discovery
<dependency><groupId>com.oyz.gulimall</groupId><artifactId>gulimall-common</artifactId><version>0.0.1-SNAPSHOT</version><exclusions><exclusion><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-netflix-ribbon</artifactId></exclusion></exclusions>
</dependency>
//加入spring-cloud-loadbalancer依赖<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-loadbalancer</artifactId>
</dependency>

之后，再次启动项目：

问题完美解决，还是得关注问题报错点：Did you forget to include spring-cloud-starter-loadbalancer，一开始没有注意到这个点，浪费了许多时间。

参考链接

Caused by: java.lang.IllegalStateException: No Feign Client for loadBalancing defined
stackoverflow
SpringCloud OpenFeign报错
No Feign Client for loadBalancing defined

spring cloud整合feign和nacos报错：No Feign Client for loadBalancing defined. Did you forget to include相关推荐

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