application.yaml报错：Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

从网上找了个开源项目，导入IDEA之后，经过一系列改bug之后，存在报错：
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

可是已经启动了mysql，数据库url也检查了好几遍，还是不行，于是乎在网上找原因，找了好久看到一个博主的帖子最终解决了我的问题。太感谢了。
原因是application.yaml没有成功编译。
指路：https://blog.csdn.net/weixin_64855868/article/details/146684772?spm=1001.2014.3001.5501
这个项目里用的也是application.yaml
原项目pom.xml：

更改之后：

然后删掉了target文件，maven下面执行clean和compile，最后运行成功了。