前言 

今天再写完一个业务，部署服务器项目时报错:
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，红色标注英文的意思为循环引用，也就是说我在deviceShelfProductServiceImpl中引用注入了tradeServiceImpl，而在tradeServiceImpl中又引用注入了deviceShelfProductServiceImpl，这种情况叫做循环依赖。

解决办法的话：

1.可以将业务代码转移至其中一个业务类中，不要两个类互相引用

2.业务代码可能过于繁琐，不好转移，那么可以使用注解@Lazy进行延迟加载，即可避免循环依赖