Access denied for user ‘‘@‘localhost‘ (using password: NO)（史上最坑爹的一次）

我在idea的properties文件中使用

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.name=root
spring.activemq.password=cao1567283

连接数据库总是报如下这个错误

我还以为是驱动，mysql版本，以及时区的问题，改了好久一直没有弄好。
最后我把连接数据库的语句改成如下这样就可以了

spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=cao1567283

就是把下划线去掉，真是无语了

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