問題：
往SpringCloud的注冊中心里注冊服務時啟動SpringBoot項目拋出異常。項目啟動報錯。
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APPLICATION FAILED TO START
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Description:
The bean 'dataSource', defined in BeanDefinition defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class], could not be registered. A bean with that name has already been defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class] and overriding is disabled.
Action:
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true
原因：
SpringBoot和SpringCloud的版本不兼容造成。
解決方案:
在配置文件application.yml中添加兩行配置信息即可，配置如下：
spring:main:allow-bean-definition-overriding: true
