错误提示：Failed to configure a DataSource: ‘url’ attribute is not specified and no embedded datasource could be configured.

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 0

此方法只针对以下情况：application.properties配置确保没有错误

application.properties图标是这样的证明没有加载

这样才是正确的

解决办法：
选中包，右键，按下F4（或者点击Open Module Setting）

看图操作，选中application.properties所在的resource

成功解决！