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

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).

Database에 연결할 때 필요한 정보가 없기 때문이다

1. application.properties 에서 db 정보를 추가하거나

spring.datasource.url=
spring.datasource.username=
spring.datasource.password=
spring.datasource.driver-class-name=

2. exclude={DataSourceAutoConfiguration.class}) 을 @SpringBootApplication에 추가를 하여 DB과정을 제외시키자

SpringBootApplication(exclude={DataSourceAutoConfiguration.class})
public class AftmApplication {

	public static void main(String[] args) {
		SpringApplication.run(AftmApplication.class, args);
	}

}