目录
一、问题现象
bash
Description:
Field autoServiceRegistration in org.springframework.cloud.client.serviceregistry.AutoServiceRegistrationAutoConfiguration required a single bean, but 2 were found:
- eurekaAutoServiceRegistration: defined by method 'eurekaAutoServiceRegistration' in class path resource [org/springframework/cloud/netflix/eureka/EurekaClientAutoConfiguration.class]
- nacosAutoServiceRegistration: defined by method 'nacosAutoServiceRegistration' in class path resource [com/alibaba/cloud/nacos/registry/NacosServiceRegistryAutoConfiguration.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
二、解决办法
检查pom文件中,是不是同时添加了Nacos和Eureka的依赖?如果是,选择一个不必要的去掉即可。比如这次异常,我保留了Nacos,去掉了Eureka。
bash
<!--Eureka客户端-->
<!--<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>2.2.6.RELEASE</version>
</dependency>-->
<!--nacos客户端-->
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
<version>2.2.6.RELEASE</version>
</dependency>
三、原因分析
Spring Boot项目启动时,AutoServiceRegistrationAutoConfiguration类需要注入一个类型为AutoServiceRegistration的bean。但是,在容器中却出现了两个Bean,其父类均为AutoServiceRegistration,就是异常中打印出的nacosAutoServiceRegistration和eurekaAutoServiceRegistration。
异常中还顺便给出了解决方案:即为其中一个bean添加注解@Primary或@Qualifier。其实,简单的解决办法就是去掉无用的依赖即可。如果其他大佬有不同看法,可以留言讨论。