前言
今天再寫完一個業務，部署服務器項目時報錯:
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'deviceShelfProductController': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'deviceShelfProductServiceImpl': Bean with name 'deviceShelfProductServiceImpl' has been injected into other beans [tradeServiceImpl] in its raw version as part of a circular reference, but has eventually been wrapped. This means that said other beans do not use the final version of the bean. This is often the result of over-eager type matching - consider using 'getBeanNamesOfType' with the 'allowEagerInit' flag turned off, for example.
其中，紅色標註英文的意思爲循環引用，也就是說我在deviceShelfProductServiceImpl中引用注入了tradeServiceImpl，而在tradeServiceImpl中又引用注入了deviceShelfProductServiceImpl，這種情況叫做循環依賴。
解決辦法的話：
1.可以將業務代碼轉移至其中一個業務類中，不要兩個類互相引用
2.業務代碼可能過於繁瑣，不好轉移，那麼可以使用註解@Lazy進行延遲加載，即可避免循環依賴