Failed to determine a suitable driver class——SpringCloud常见问题

问题背景：SpingCloud在启动Eureka服务时报如下错误：

`在这里插入代码片Error starting ApplicationContext. To display the conditions report re-run your application with ‘debug’ enabled.
2020-11-13 16:18:34.509 ERROR 10004 — [ main] o.s.b.d.LoggingFailureAnalysisReporter :
APPLICATION FAILED TO START
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).
Process finished with exit code 1

原因
在新建Eureka的module时，引入了mybatis依赖

SpingBoot会默认加载org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration这个类，而DataSourceAutoConfiguration类使用了@Configuration注解向spring注入了dataSource
bean，又因为项目（eureka-server模块和短信模块）中并没有关于dataSource相关的配置信息，所以当spring创建dataSource
bean时因缺少相关的信息就会报错。

解决方式

• 1、在@SpringBootApplication注解上加上exclude，解除自动加载DataSourceAutoConfiguration。
  注：验证过，但是没有成功
• 2、在依赖中拿掉mybatis依赖：