昨天把spring boot升级到2.1.0版本，但是报错如下

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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

查了下，原来和spring cloud版本不兼容，更改如下：

<spring-cloud.version>Finchley.SR1</spring-cloud.version>
改成
<spring-cloud.version>Greenwich.M1</spring-cloud.version>

但是spring boot 2.1 和Greenwich.M1搭配仍然有部分问题，有人建议用2.1的snapshot版本，考虑稳定性问题，我有回退到2.0.6 + Finchley.SR1 了，可以看出spring boot是用版本的第二个数字保证兼容性的。