springboot启动报错：Cannot determine embedded database driver class for database type NONE.

 package cn.zb.test;

 import org.springframework.boot.SpringApplication;

 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;

 import org.springframework.boot.autoconfigure.SpringBootApplication;

 import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

 @SpringBootApplication

 public class Application {

 public static void main(String[] args) {

 SpringApplication.run(Application.class, args);

    }

 }

点击run启动后报错如下：

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::       (v1.5.10.RELEASE)

-- ::25.294  INFO  --- [           main] cn.zb.test.Application                   : Starting Application on C300ZA8PPUJ5JRS with PID  (F:\eclipse\workspace\springboot_parent\springboot_web\target\classes started by ABO in F:\eclipse\workspace\springboot_parent\springboot_web)
-- ::25.303  INFO  --- [           main] cn.zb.test.Application                   : No active profile set, falling back to default profiles: default
-- ::25.361  INFO  --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@f08448: startup date [Sun Jun  :: CST ]; root of context hierarchy
-- ::25.914  WARN  --- [           main] o.m.s.mapper.ClassPathMapperScanner      : No MyBatis mapper was found in '[cn.zb.test]' package. Please check your configuration.
-- ::27.616  INFO  --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s):  (http)
-- ::27.628  INFO  --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat
-- ::27.629  INFO  --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.
-- ::27.736  INFO  --- [ost-startStop-] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
-- ::27.736  INFO  --- [ost-startStop-] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in  ms
-- ::27.900  INFO  --- [ost-startStop-] o.s.b.w.servlet.ServletRegistrationBean  : Mapping servlet: 'dispatcherServlet' to [/]
-- ::27.905  INFO  --- [ost-startStop-] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2019-06-02 10:13:27.905  INFO 10868 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2019-06-02 10:13:27.905  INFO 10868 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2019-06-02 10:13:27.905  INFO 10868 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2019-06-02 10:13:28.412  INFO 10868 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@f08448: startup date [Sun Jun 02 10:13:25 CST 2019]; root of context hierarchy
2019-06-02 10:13:28.501  INFO 10868 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/index/{name}]}" onto public java.lang.String cn.zb.test.HelloWorldController.index(java.lang.String)
2019-06-02 10:13:28.506  INFO 10868 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2019-06-02 10:13:28.507  INFO 10868 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2019-06-02 10:13:28.541  INFO 10868 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2019-06-02 10:13:28.541  INFO 10868 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2019-06-02 10:13:28.582  INFO 10868 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
-- ::28.634  WARN  --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: 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 (no profiles are currently active).
-- ::28.637  INFO  --- [           main] o.apache.catalina.core.StandardService   : Stopping service Tomcat
-- ::28.648  WARN  --- [ost-startStop-] o.a.c.loader.WebappClassLoaderBase       : The web application [ROOT] appears to have started a thread named [Abandoned connection cleanup thread] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread:
 java.lang.Object.wait(Native Method)
 java.lang.ref.ReferenceQueue.remove(Unknown Source)
 com.mysql.jdbc.AbandonedConnectionCleanupThread.run(AbandonedConnectionCleanupThread.java:)
-- ::28.660  INFO  --- [           main] utoConfigurationReportLoggingInitializer : 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
-- ::28.665 ERROR  --- [           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 (no profiles are currently active).

这是因为spring boot默认会加载org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration类，DataSourceAutoConfiguration类使用了@Configuration注解向spring注入了dataSource bean。因为工程中没有关于dataSource相关的配置信息，当spring创建dataSource bean因缺少相关的信息就会报错。

因为我仅仅只是使用spring boot来写一些很简单的例子来学习它，在Application类上增加@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})

阻止spring boot自动注入dataSource bean

package cn.zb.test;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
@SpringBootApplication
@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
public class Application {

    public static void main(String[] args) {

         SpringApplication.run(Application.class, args);
    }

}

这样就可以正常启动啦！

.