nable to load bean: type:com.opensymphony.xwork2.util.ValueStackFactory

严重: Exception starting filter struts2

Unable to load bean: type:com.opensymphony.xwork2.util.ValueStackFactory class:com.opensymphony.xwork2.ognl.OgnlValueStackFactory - bean - jar:file:/C:/Tomcat%206.0/webapps/TestStruts/WEB-INF/lib/struts2-core-2.2.1.1.jar!/struts-default.xml:71:140

at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.Java:428)

at org.apache.struts2.dispatcher.FilterDispatcher.init(FilterDispatcher.java:190)

at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:275)

at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)

at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:108)

at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3709)

at org.apache.catalina.core.StandardContext.start(StandardContext.java:4356)

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:525)

at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:924)

at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:887)

at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)

at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1215)

at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:293)

at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)

at org.apache.catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:1337)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1601)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.processChildren(ContainerBase.java:1610)

at org.apache.catalina.core.ContainerBase$ContainerBackgroundProcessor.run(ContainerBase.java:1590)

at java.lang.Thread.run(Thread.java:619)

Caused by: Unable to load bean: type:com.opensymphony.xwork2.util.ValueStackFactory class:com.opensymphony.xwork2.ognl.OgnlValueStackFactory - bean - jar:file:/C:/Tomcat%206.0/webapps/TestStruts/WEB-INF/lib/struts2-core-2.2.1.1.jar!/struts-default.xml:71:140

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:371)

at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:415)

... 20 more

Caused by: java.lang.IncompatibleClassChangeError: Implementing class

at java.lang.ClassLoader.defineClass1(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:620)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)

at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1819)

at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:872)

at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1327)

at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1206)

at com.opensymphony.xwork2.util.ClassLoaderUtil.loadClass(ClassLoaderUtil.java:139)

at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:180)

... 25 more

2011-4-21 19:22:24 org.apache.catalina.core.StandardContext start

严重: Error filterStart

2011-4-21 19:22:24 org.apache.catalina.core.StandardContext start

严重: Context [/TestStruts] startup failed due to previous errors

2011-4-21 19:22:24 org.apache.catalina.core.ApplicationContext log

信息: Closing spring root WebApplicationContext

上面的问题的解决方案是要确定没有重复的jar包。比如说我复制了一部分jar包到lib下，而且我还Add external jar，这两种情况下只要要重复的，tomcat就不知道如何处理了。就会导致上面的错误。所以，要确定不要有重复的jar包。