struts2做项目报错：java.lang.RuntimeException: java.lang.reflect.InvocationTargetException 的解决方法

com.opensymphony.xwork2.util.logging.commons.CommonsLogger error
严重: Dispatcher initialization failed
java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
 at com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:295)
 at com.opensymphony.xwork2.inject.ContainerImpl$ConstructorInjector.construct(ContainerImpl.java:431)
 at com.opensymphony.xwork2.inject.ContainerBuilder$5.create(ContainerBuilder.java:207)
 at com.opensymphony.xwork2.inject.Scope$2$1.create(Scope.java:51)
 at com.opensymphony.xwork2.inject.ContainerBuilder$3.create(ContainerBuilder.java:93)
 at com.opensymphony.xwork2.inject.ContainerBuilder$7.call(ContainerBuilder.java:487)
 at com.opensymphony.xwork2.inject.ContainerBuilder$7.call(ContainerBuilder.java:484)
 at com.opensymphony.xwork2.inject.ContainerImpl.callInContext(ContainerImpl.java:574)
 at com.opensymphony.xwork2.inject.ContainerBuilder.create(ContainerBuilder.java:484)
 at com.opensymphony.xwork2.config.impl.DefaultConfiguration.createBootstrapContainer(DefaultConfiguration.java:252)
 at com.opensymphony.xwork2.config.impl.DefaultConfiguration.reloadContainer(DefaultConfiguration.java:193)
 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.listener.StrutsListener.contextInitialized(StrutsListener.java:47)
 at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)
 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.deployDirectory(HostConfig.java:1041)
 at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:964)
 at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:502)
 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:445)
 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)
Caused by: java.lang.reflect.InvocationTargetException
 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 com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector.inject(ContainerImpl.java:293)
 ... 39 more
Caused by: java.lang.ExceptionInInitializerError
 at com.opensymphony.xwork2.ognl.OgnlValueStackFactory.setContainer(OgnlValueStackFactory.java:85)
 ... 44 more
Caused by: java.lang.IllegalArgumentException: Javassist library is missing in classpath! Please add missed dependency!
 at ognl.OgnlRuntime.(OgnlRuntime.java:165)
 ... 45 more
Caused by: java.lang.ClassNotFoundException: javassist.ClassPool
 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645)
 at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491)
 at java.lang.ClassLoader.loadClassInternal(Unknown Source)
 at java.lang.Class.forName0(Native Method)
 at java.lang.Class.forName(Unknown Source)
 at ognl.OgnlRuntime.(OgnlRuntime.java:162)
 ... 45 more
2010-12-31 15:41:23 org.apache.catalina.core.StandardContext listenerStart
严重: Exception sending context initialized event to listener instance of class org.apache.struts2.dispatcher.ng.listener.StrutsListener
java.lang.reflect.InvocationTargetException - Class: com.opensymphony.xwork2.inject.ContainerImpl$MethodInjector
File: ContainerImpl.java
Method: inject
Line: 295 - com/opensymphony/xwork2/inject/ContainerImpl.java:295:-1
 at org.apache.struts2.dispatcher.Dispatcher.init(Dispatcher.java:428)
 at org.apache.struts2.dispatcher.ng.InitOperations.initDispatcher(InitOperations.java:69)
 at org.apache.struts2.dispatcher.ng.listener.StrutsListener.contextInitialized(StrutsListener.java:47)
 at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4135)
 at org.apache.catalina.core.StandardContext.start(StandardContext.java:4630)
 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.deployDirectory(HostConfig.java:1041)
 at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:964)
 at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:502)
 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)

......

在项目中添加javassist-3.7.ga.jar包就OK了。