SpringBoot扫描不到类，注入失败A component required a bean of type 'XXService' that could...
SpringBoot项目的Bean装配默认规则是根据Application类所在的包位置从上往下扫描！
“Application类”是指SpringBoot项目入口类。
这个类的位置很关键：
若是Application类所在的包为：com.boot.app，则只会扫描com.boot.app包及其全部子包，若是service或dao所在包不在com.boot.app及其子包下，则不会被扫描！
即, 把Application类放到dao、service所在包的上级，com.boot.Application
知道这一点很是关键，大多数状况下bean没法注入进来都是这个缘由引发的。
java
本人的错误缘由是：entity，service，serviceImpl，controller等这些包和Application.java SpringBoot程序的入口不在同一个包且不在Application.java的子包中。app
缘由是：SpringBoot运行时所加载的包是Application.java本包及其子包的代码。因此根本扫描不到其余包，你怎么改注解都是错误的。it
缘由之二:就是bean加载顺序不对,比方说你的拦截器是在service加载以前就生成了,application在生成拦截器bean的时候怎么能找到service这个bean呢.
io
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