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java.lang.NullPointerException: 	at com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance(SpringObjectFactory.java:245)	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.verifyResultType(XmlConfigurationProvider.java:608)	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addResultTypes(XmlConfigurationProvider.java:578)	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:534)	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:295)	at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:112)	at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:264)	at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:67)	at org.apache.struts2.dispatcher.Dispatcher.getContainer(Dispatcher.java:967)	at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:435)	at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:479)	at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:74)	at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:57)	at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:279)	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:260)	at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:105)	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4583)	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5207)	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)	at java.util.concurrent.FutureTask.run(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)