SpringBoot掃描不到類，注入失敗A component required a bean of type 'XXService' that could...
SpringBoot項目的Bean裝配默認規則是根據Application類所在的包位置從上往下掃描！
「Application類」是指SpringBoot項目入口類。
這個類的位置很關鍵：
若是Application類所在的包爲：com.boot.app，則只會掃描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，則不會被掃描！
即, 把Application類放到dao、service所在包的上級，com.boot.Application
知道這一點很是關鍵，大多數狀況下bean沒法注入進來都是這個緣由引發的。
java
本人的錯誤緣由是：entity，service，serviceImpl，controller等這些包和Application.java SpringBoot程序的入口不在同一個包且不在Application.java的子包中。app
緣由是：SpringBoot運行時所加載的包是Application.java本包及其子包的代碼。因此根本掃描不到其餘包，你怎麼改註解都是錯誤的。it
緣由之二:就是bean加載順序不對,比方說你的攔截器是在service加載以前就生成了,application在生成攔截器bean的時候怎麼能找到service這個bean呢.
io
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