程式之前都运行正常，忽然一天运行报错：
*************************** 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).
也不知道是什么原因，配置文件不起作用了，
所以在 Project Structure中查看一下 Modules，发现果然，src -> main -> resources这个文件夹，不是Resources的类型
修改其为 Resources，然后重新运行即可