解決BeanNotOfRequiredTypeException: Bean named 'XXX' must be of type XXX, but was actually of type XXX問題

　　Java新手，困擾了一下午。

　　發布時總是報這樣一個錯誤。

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'XXX': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'XXX' must be of type [XXXX], but was actually of type [XXXXX]
at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:306)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1106)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)

Caused by: org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'XXX' must be of type [XXXX], but was actually of type [XXXXX]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:360)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:269)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)

最后找到原因：action中引用的包名，與spring bean注冊文件中注冊的包不一致，導致action沒有引用到目標包，反而引用一個錯誤的包（舊包）。

解決方法：確定要引用的新的包名，在action中去掉無錯的import，重新import新的包。