为了练习自己的敲代码的能力，对一个小module，又写了一次
里面的dao接口，实体类，以及mapper文件都使用了一个相同的name，只是P大小写问题
导致出现了：Failed to instantiate [com.powernode.dao.PaymentDao]: Specified class is an interface，指定的类是一个接口。
解决办法：将第二个module中的dao接口，实体类和mapper文件改名。
SpringBoot学习中出现：Failed to instantiate [com.powernode.dao.PaymentDao]: Specified class is an interface的错误
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