Caused by: Cannot locate the chosen ObjectFactory implementation: spring - [unknown location]

今天在做struts和Spring框架整合的时候当我把项目部署到tomcat服务器上之后控制台报了一个错误：

Caused by: Unable to load configuration. - [unknown location]
 at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:70)
 at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:429)
 at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:471)
 ... 19 more

Caused by: Cannot locate the chosen ObjectFactory implementation: spring - [unknown location]

   at org.apache.struts2.config.BeanSelectionProvider.alias(BeanSelectionProvider.java:391)
 at org.apache.struts2.config.BeanSelectionProvider.alias(BeanSelectionProvider.java:362)
 at org.apache.struts2.config.BeanSelectionProvider.register(BeanSelectionProvider.java:288)
 at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:215)
 at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)
 ... 21 more

当然，问题的解决是在第二个提示信息：

Caused by: Cannot locate the chosen ObjectFactory implementation: spring - [unknown location]

出现问题的原因是：

       缺少struts2-spring-plugin-2.1.8.1.jar，该文件是Spring与struts整合时必须要用到的一个jar文件！导入lib文件夹下问题解决了！