Struts的action自动装配到spring.doc
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Struts在与Spring整合是要实现Struts的action自动装配到spring容器中,我们经常遇到的问题是:java.lang.NullPointException这个空指针异常,我碰到的有这么几种解决方案:
1.看一下你的set方法是否存在。
2.是否在web.xml中配置了“当web项目启动的时候,让spring扫描整个项目。”,当然也要加上一个名为:struts-spring-plugin***.jar的包,这个包实现了action装配到spring的功能。(如果已经加了这个包,也配置了web.xml还出现空指针异常,那么可能是你的struts-spring-plugin***.jar的版本不配套,还几个版本试试)
web.xml中添加的配置(添加在Struts配置的前面):
[html]?view plaincopy
span?style=font-size:24px;??listener??
????????listener-classorg.springframework.web.context.ContextLoaderListener/listener-class??
????/listener??
????context-param??
?????????param-namecontextConfigLocation/param-name??
?????????param-valueclasspath:bean.xml/param-value??
????/context-param/span??
当你已经完成上面描述的配置的时候,还可能出现下面的这个异常,异常信息如下(这个是浏览器报的异常,后台没有异常,服务器启动正常):
[plain]?view plaincopy
span?style=font-size:24px;Struts?Problem?Report??
??
Struts?has?detected?an?unhandled?exception:??
??
Messages:?????
Cannot?convert?value?of?type?[xy.$Proxy8?implementing?com.zsq.wxssh.service.UserService,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised]?to?required?type?[com.zsq.wxssh.serviceimpl.UserServiceImpl]?for?property?userServiceImpl:?no?matching?editors?or?conversion?strategy?found??
Failed?to?convert?property?value?of?type?[xy.$Proxy8?implementing?com.zsq.wxssh.service.UserService,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised]?to?required?type?[com.zsq.wxssh.serviceimpl.UserServiceImpl]?for?property?userServiceImpl;?nested?exception?is?java.lang.IllegalArgumentException:?Cannot?convert?value?of?type?[xy.$Proxy8?implementing?com.zsq.wxssh.service.UserService,org.springframework.aop.SpringProxy,org.springframework.aop.framework.Advised]?to?required?type?[com.zsq.wxssh.serviceimpl.UserServiceImpl]?for?property?userServiceImpl:?no?matching?editors?or?conversion?strategy?found??
Unable?to?instantiate?Action,?com.zsq.wxssh.action.LoginAction,?defined?for?Login?in?namespace?/Failed?to?convert?property?value?of?type?[xy.$Proxy8?implementing?com.zsq.wxssh.
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