记一次Spring boot集成mybatis错误修复过程 Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.

最近自己写了一份代码签入到github，然后拉下来运行报下面的错误

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
-- ::02.246 ERROR  --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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APPLICATION FAILED TO START
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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 

调试了很久发现是配置文件没有生效，找到一篇文章（https://blog.csdn.net/ht_kasi/article/details/82259860）后来才发现根本原因

resouce文件夹失效 ，图标与正常的不一样

解决方法，右键resouces文件夹，设置为resouces root即恢复正常