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APPLICATION FAILED TO START
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Description:

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

Reason: Failed to determine a suitable driver class


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).


How to solve this error:


I add "implementation 'org.springframework.boot:spring-boot-starter-data-jpa:2.5.8'" dependency in build.gradle.

But, I did not register datatsource.

So, this is my practice of Spring Boot.

I delete "spring-boot-starter-data" dependency in my build.gradle