本文档介绍了在Spring Boot应用中遇到的Feign客户端bean注册问题，错误信息显示不允许bean定义覆盖。解决方法是在配置文件中设置`spring.main.allow-bean-definition-overriding=true`，允许bean定义的覆盖。这将允许Feign客户端多次调用服务。
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
Description: //错误
The bean 'tokenClient.FeignClientSpecification' could not be registered. A bean with that name has already been defined and overriding is disabled.
Action: //提示
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true
yml文件里面配置：
spring:
main:
allow-bean-definition-overriding: true //feing默认只允许调用一次服务 开启允许多次调用
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