问题
java.lang.AbstractMethodError: org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient.choose(Ljava/lang/String;Lorg/springframework/cloud/client/loadbalancer/Request;)Lorg/spring

原因
会出现这个问题是导入 spring-cloud-loadbalancer后nacos中 pring-cloud-starter-netflix-ribbon会与它冲突，造成loadbalanc包失效。所以在pom文件中剔除掉nacos中的spring-cloud-starter-netflix-ribbon

解决方案

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