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java.lang.NullPointerException: 	at com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance(SpringObjectFactory.java:189)	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.verifyResultType(XmlConfigurationProvider.java:479)	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addResultTypes(XmlConfigurationProvider.java:450)	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.addPackage(XmlConfigurationProvider.java:407)	at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.loadPackages(XmlConfigurationProvider.java:239)	at org.apache.struts2.config.StrutsXmlConfigurationProvider.loadPackages(StrutsXmlConfigurationProvider.java:111)	at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:152)	at com.opensymphony.xwork2.config.ConfigurationManager.getConfiguration(ConfigurationManager.java:52)	at org.apache.struts2.dispatcher.Dispatcher.init_PreloadConfiguration(Dispatcher.java:395)	at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:452)	at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:205)	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:295)	at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422)	at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:115)	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3838)	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4488)	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:546)	at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:905)	at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:740)	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:500)	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)	at org.apache.catalina.core.StandardHost.start(StandardHost.java:785)	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)	at org.apache.catalina.core.StandardService.start(StandardService.java:519)	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)	at org.apache.catalina.startup.Catalina.start(Catalina.java:581)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)