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.
参考：https://www.jianshu.com/p/91376ce67c72
这是因为添加了数据库组件，所以autoconfig会去读取数据源配置，而我新建的项目还没有配置数据源，所以会导致异常出现。
即：@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
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