application.properties文件没有叶子图标，springboot项目启动的时候也报错

错误日志：

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-07-13 16:04:26.339 ERROR 21144 --- [           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).

Disconnected from the target VM, address: '127.0.0.1:7870', transport: 'socket'

Process finished with exit code 1

解决办法：

我一直没有注意到我的文件夹不是resources目录，将它重新设置为resources即可

启动项目的时候一定要检查一下,有时候IDEA会出bug把之前标记为资源文件的目录给取消标记，导致项目启动的时候，项目找不到配置文件，因为它都找不到你资源文件的目录。