转自：https://www.cnblogs.com/kmsfan/p/7189626.html
017-05-04 11:22:54.957 INFO 6164 --- [ main] com.example.GirlApplication : Starting GirlApplication on GOAFJLQVOL9HVXB with PID 6164 (E:girl argetclasses started by Administrator in E:girl)
2017-05-04 11:22:54.959 INFO 6164 --- [ main] com.example.GirlApplication : The following profiles are active: dev
2017-05-04 11:22:55.155 INFO 6164 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@6b4a4e18: startup date [Thu May 04 11:22:55 CST 2017]; root of context hierarchy
2017-05-04 11:22:56.182 INFO 6164 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-05-04 11:22:56.189 INFO 6164 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2017-05-04 11:22:56.190 INFO 6164 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.14
2017-05-04 11:22:56.253 INFO 6164 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-05-04 11:22:56.254 INFO 6164 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1102 ms
2017-05-04 11:22:56.350 INFO 6164 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-05-04 11:22:56.353 INFO 6164 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-05-04 11:22:56.353 INFO 6164 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-05-04 11:22:56.353 INFO 6164 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-05-04 11:22:56.353 INFO 6164 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-05-04 11:22:56.381 WARN 6164 --- [ main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Cannot determine embedded database driver class for database type NONE. If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (the profiles "dev" are currently active).
2017-05-04 11:22:56.383 INFO 6164 --- [ main] o.apache.catalina.core.StandardService : Stopping service Tomcat
2017-05-04 11:22:56.397 INFO 6164 --- [ main] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-05-04 11:22:56.404 ERROR 6164 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Cannot determine embedded database driver class for database type NONE
Action:
If you want an embedded database please put a supported one on the classpath. If you have database settings to be loaded from a particular profile you may need to active it (the profiles "dev" are currently active).
Process finished with exit code 1
您好，这是因为你的 application.yml 文件中关于数据库的配置格式出错导致的。注意：datasource之前要有空格，也就是说完整的配置应该是 spring.datasource.driver-class-name.以下为我的配置：
spring:
profiles:
active: dev
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/ddgirl
username: root
password: root
jpa:
hibernate:
ddl-auto: update
show-sql: true