Unable to load bean: type: class:com.opensymphony.xwork2.ObjectFactory - bean - jar

昨天我在配置一个ssh项目，启动tomcat时，总是报：

2011-03-16 13:52:56,671 [main] ERROR org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[/testssh1]  - #org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3639)# - Exception starting filter struts2
Unable to load bean: type: class:com.opensymphony.xwork2.ObjectFactory - bean - jar:file:/E:/apache-tomcat-5.5.25/webapps/testssh1/WEB-INF/lib/struts2-core-2.1.8.1.jar!/struts-default.xml:29:72
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:208)
 at org.apache.struts2.config.StrutsXmlConfigurationProvider.register(StrutsXmlConfigurationProvider.java:101)
 at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reload(DefaultConfiguration.java:131)
 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.ng.InitOperations.initDispatcher(InitOperations.java:69)
 at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
 at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:221)
 at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:302)
 at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:78)
 at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3635)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4222)
 at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:760)
 at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:740)
 at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:544)
 at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)
 at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)
 at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
 at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
 at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
 at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:120)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1022)
 at org.apache.catalina.core.StandardHost.start(StandardHost.java:736)
 at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1014)
 at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
 at org.apache.catalina.core.StandardService.start(StandardService.java:448)
 at org.apache.catalina.core.StandardServer.start(StandardServer.java:700)
 at org.apache.catalina.startup.Catalina.start(Catalina.java:552)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:295)
 at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:433)
Caused by: Bean type class com.opensymphony.xwork2.ObjectFactory with the name xwork has already been loaded by bean - jar:file:/E:/apache-tomcat-5.5.25/webapps/testssh1/WEB-INF/lib/struts2-core-2.0.14.jar!/struts-default.xml:30:72 - bean - jar:file:/E:/apache-tomcat-5.5.25/webapps/testssh1/WEB-INF/lib/struts2-core-2.1.8.1.jar!/struts-default.xml:29:72
 at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:193)
 ... 34 more

 

在网上差了一下，可以从一下几个方面考虑解决：

1、清理所有缓存，重新部署 
2、换一只猫也行 
3、网上说的吧struts-pring-plugin.jar插件包给去掉   （有些人成功，但是我却没有成功） 
4、还有些人这样说：很多朋友在使用Struts2时都会遇到这个异常，导致其主要原因还是因为加错了包,大家只要将xwork-2.1.1.jar和struts2-core-2.1.2.jar，换成xwork-2.0.4.jar和struts2-core-2.0.14.jar或者struts2-core-2.0.14.jar 
5,   工程间也会冲突,remove其他的工程可能可以解决问题

我查看了一下我的工程引进的jar发现struts2-core-2.1.8.1.jar 和struts2-core-1.3.10.jar冲突了，把struts2-core-1.3.10.jar移除后，问题解决了。