Spring boot 启动报错 Failed to auto-configure a DataSource

Spring Boot 2.0正式版发布，寻思着搭个小demo尝试一下Spring Boot的新特性，使用idea创建项目。在选择组件时添加了mysql、mybatis 然后在第一次启动的时候启动报错，错误信息如下：

2018-03-29 22:09:30.459  INFO 10016 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2018-03-29 22:09:30.876  WARN 10016 --- [           main] ConfigServletWebServerApplicationContext : 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$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class
2018-03-29 22:09:30.879  INFO 10016 --- [           main] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2018-03-29 22:09:30.920  INFO 10016 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2018-03-29 22:09:30.924 ERROR 10016 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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

Description:

Failed to auto-configure a DataSource: 'spring.datasource.url' is not specified and no embedded datasource could be auto-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).


Process finished with exit code 1

解决方法  1：

              注解这样写：   

        @SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})

解决方案 2：

1,。添加如下依赖
     
            org.springframework.boot
            spring-boot-starter-web
           
           
               
                    org.springframework.boot
                    spring-boot-starter-tomcat
               
           
       

2.必须要加否则启动

            javax.servlet
            javax.servlet-api