首先我报这个错误的原因是：idea没有识别出来application.properties是配置文件，因为没有叶子图标。解决办法很简单：
1.右键你的resources文件夹
2.选择“Mark Directory as”
3.再选择Resources Root
这样就可以了，你会发现application.properties文件变成叶子图标了
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