struts2.2+spring 2.5+hibernate3 Exception!

本地运行米有问题，传到服务器报以下异常：
500 Servlet Exception
java.lang.NullPointerException
at com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance(SpringObjectFactory.java:220)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.verifyResultType(XmlConfigurationProvider.java:530)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addResultTypes(XmlConfigurationProvider.java:501)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:457)
at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:275)
at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:111)
at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:204)
at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:66)
at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:371)
at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:415)
at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:69)
at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
at com.caucho.server.dispatch.FilterManager.createFilter(FilterManager.java:134)
at com.caucho.server.dispatch.FilterMapper.buildDispatchChain(FilterMapper.java:169)
at com.caucho.server.webapp.Application.buildInvocation(Application.java:1830)
at com.caucho.server.webapp.ApplicationContainer.buildInvocation(ApplicationContainer.java:728)
at com.caucho.server.host.Host.buildInvocation(Host.java:459)
at com.caucho.server.host.HostContainer.buildInvocation(HostContainer.java:353)
at com.caucho.server.resin.ServletServer.buildInvocation(ServletServer.java:653)
at com.caucho.server.dispatch.DispatchServer.buildInvocation(DispatchServer.java:198)
at com.caucho.server.hmux.HmuxRequest.handleRequest(HmuxRequest.java:415)
at com.caucho.server.port.TcpConnection.run(TcpConnection.java:514)
at com.caucho.util.ThreadPool.runTasks(ThreadPool.java:520)
at com.caucho.util.ThreadPool.run(ThreadPool.java:442)
at java.lang.Thread.run(Thread.java:595)
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Resin-3.0.24 (built Thu, 16 Aug 2007 09:38:29 PDT)