SSH-service错误

最新推荐文章于 2024-11-17 21:57:18 发布

原创最新推荐文章于 2024-11-17 21:57:18 发布 · 622 阅读

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本文介绍了一个关于Struts2框架下Spring注入错误导致的Bean类型异常问题及解决方案。具体表现为尝试注入BookServiceImpl接口的具体实现时，却得到了一个代理对象。文中详细解释了问题的原因在于使用了实现类而非接口进行注入，并给出了正确的修改方式。

type Exception report

message Unable to instantiate Action, book.action.BookAction, defined for 'user' in namespace '/'Error creating bean with name 'book.action.BookAction': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'bookService' must be of type [book.service.impl.BookServiceImpl], but was actually of type [com.sun.proxy.$Proxy85]

description The server encountered an internal error that prevented it from fulfilling this request.

exception

Unable to instantiate Action, book.action.BookAction,  defined for 'user' in namespace '/'Error creating bean with name 'book.action.BookAction': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'bookService' must be of type [book.service.impl.BookServiceImpl], but was actually of type [com.sun.proxy.$Proxy85]
	com.opensymphony.xwork2.DefaultActionInvocation.createAction(DefaultActionInvocation.java:316)
	com.opensymphony.xwork2.DefaultActionInvocation.init(DefaultActionInvocation.java:397)
	com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:194)
	org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
	org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:37)
	com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
	org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:552)
	org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
	org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)

原因是 private BookServiceImpl bookService;

不能直接用实现类，要用接口

改为： private BookService bookService;