[RESOLVIDO] Problema ao instalar o Struts da apostila fj21 Caelum

Front-end
#1

Oolá, estou usando a apostila da caelum e esta dando erro quando eu instalo o Struts 2
estou colocando esses jar no lib do projeto:
commons-fileupload-1.x.x.jar, commons-io-1.x.x.jar, commons-logging-1.0.4.jar, freemarker-
2.3.15.jar, ognl-2.7.3.jar, struts2-convention-plugin-2.1.8.1.jar, struts2-core-2.1.8.1.jar e xwork-core-
2.1.6.jar.

essas são as classes:

package br.com.caelum.tarefas.action;

import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.*;


public class OlaMundoAction {
    @Action(value = "olaMundoStruts", results = {
        @Result(location = "/olaMundoStruts.jsp", name = "ok") }
	)
	
	public String execute() {
		System.out.println("Executando a lógica com Struts2");
		return "ok";
	}
}
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h2>Olá mundo com Struts2!</h2>
</body>
</html>
<web-app xmlns:javaee="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

 
</web-app>

Esta dando esse erro:

GRAVE: 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.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
	at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:269)
	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:250)
	at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:368)
	at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:98)
	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4193)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4792)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:138)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:990)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:772)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:138)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:990)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:275)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:138)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:424)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:138)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:648)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:138)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:576)
	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:288)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:415)
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.<clinit>(OgnlRuntime.java:165)
	... 45 more
Caused by: java.lang.ClassNotFoundException: javassist.ClassPool
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1664)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1509)
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Unknown Source)
	at ognl.OgnlRuntime.<clinit>(OgnlRuntime.java:162)
	... 45 more
17/09/2010 17:21:07 org.apache.catalina.core.StandardContext filterStart
GRAVE: Exception starting filter struts2
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.filter.StrutsPrepareAndExecuteFilter.init(StrutsPrepareAndExecuteFilter.java:51)
	at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:269)
	at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:250)
	at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:368)
	at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:98)
	at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4193)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4792)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:138)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:990)
	at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:772)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:138)
	at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:990)
	at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:275)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:138)
	at org.apache.catalina.core.StandardService.startInternal(StandardService.java:424)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:138)
	at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:648)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:138)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:576)
	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:288)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:415)

Obrigada

#2 
Caused by: java.lang.IllegalArgumentException: Javassist library is missing in classpath! Please add missed dependency!

parece que esta faltando a biblioteca “javassist”

#3

Olá everjava, obrigada era isso mesmo funcionou, só fica aqui a duvida:
esse jar é do JBOSS, certo? porque ele é necessário para o struts funcionar? e caso alguem tenha usando essa apostila para estudar, porque ela não estaria na lista de JAR do struts?
Obrigada, funcionou, mas ficou essa dvida.

#4