[spring boot] Reason: Failed to determine suitable jdbc url 또는 jdbcUrl is required with driverClassName 발생시

***************************
APPLICATION FAILED TO START
***************************

Description:

Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

Reason: Failed to determine suitable jdbc url


Action:

Consider the following:
	If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
	If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).

위 처럼 오류 발생시, application.properties 또는 yml 파일내 url 네이밍을 아래처럼 변경해보라!

( driver-class-name은 보나스 )

#before

spring.datasource.driverClassName =  org.mariadb.jdbc.Driver
spring.datasource.jdbcUrl =  jdbc:mariadb://localhost:3306/study
...
...

#after
spring.datasource.driver-class-name =  org.mariadb.jdbc.Driver
spring.datasource.jdbc-url =  jdbc:mariadb://localhost:3306/study
...
...

spring boot 예전엔 저렇게 네이밍을 썼나봐... (참고로 spring boot 2.6.2  사용중)