struts2.0入门～出错，急啊～～～～～～～

Question

2008-07-11 16:53:17,156  INFO (org.apache.struts2.config.BeanSelectionProvider:185) - Loading global messages from globalMessages
2008-07-11 16:53:17,296  INFO (com.opensymphony.xwork2.util.ObjectTypeDeterminerFactory:30) - Detected GenericsObjectTypeDeterminer, initializing it...
2008-07-11 16:53:17,296  INFO (com.opensymphony.xwork2.util.XWorkConverter:203) - Detected AnnotationXWorkConverter, initializing it...
log4j:WARN No appenders could be found for logger (com.opensymphony.xwork2.config.providers.XmlConfigurationProvider).
log4j:WARN Please initialize the log4j system properly.
2008-7-11 16:53:18 org.apache.catalina.core.StandardContext filterStart
严重: Exception starting filter struts2
java.lang.NullPointerException
at com.opensymphony.xwork2.spring.SpringObjectFactory.getClassInstance(SpringObjectFactory.java:188)
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:201)
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.start(HostConfig.java:1147)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
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:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:578)
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:413)
2008-7-11 16:53:18 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2008-7-11 16:53:18 org.apache.catalina.core.StandardContext start
严重: Context [/struts2demo] startup failed due to previous errors
2008-7-11 16:53:18 org.apache.coyote.http11.Http11Protocol start
信息: Starting Coyote HTTP/1.1 on http-8080
2008-7-11 16:53:18 org.apache.jk.common.ChannelSocket init
信息: JK: ajp13 listening on /0.0.0.0:8009
2008-7-11 16:53:18 org.apache.jk.server.JkMain start
信息: Jk running ID=0 time=0/15  config=null
2008-7-11 16:53:18 org.apache.catalina.startup.Catalina start
信息: Server startup in 3091 ms

Answer 1

此回复为自动发出,仅用于显示而已，并无任何其他特殊作用
楼主【hailang3810986】截止到2008-07-11 16:59:56的历史汇总数据(不包括此帖)：
发帖的总数量:2                        发帖的总分数:40                       每贴平均分数:20                       
回帖的总数量:1                        得分贴总数量:0                        回帖的得分率:0%                       
结贴的总数量:0                        结贴的总分数:0                        
无满意结贴数:0                        无满意结贴分:0                        
未结的帖子数:2                        未结的总分数:40                       
结贴的百分比:0.00  %               结分的百分比:0.00  %                  
无满意结贴率:---------------------无满意结分率:---------------------
如何结贴请参考这里：http://topic.csdn.net/u/20080501/09/ef7ba1b3-6466-49f6-9d92-36fe6d471dd1.html

Answer 2

给你个最简单的
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
struts.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<package name="struts2" extends="struts-default">
<action name="login" class="com.test.action.LoginAction">
<result name="input">/login2.jsp</result>
<result name="failer">/login2.jsp</result>
<result name="success">/result.jsp</result>
</action>
<action name="pointConverter" class="com.test.action.PointAction">
<result name="success">/output.jsp</result></action>
</package>
</struts>
LoginAction.javapackage com.test.action;import com.opensymphony.xwork2.ActionSupport;public class LoginAction extends ActionSupport {
/**
 * 
 */
private static final long serialVersionUID = -74906200993380354L;
private String username;
private String password; public String getUsername() {
return username;
} public void setUsername(String username) {
this.username = username;
} public String getPassword() {
return password;
} public void setPassword(String password) {
this.password = password;
} public String execute() throws Exception {
if("hello".equals(this.getUsername().trim())&&"world".equals(this.getPassword().trim())){
return this.SUCCESS;
}else{
this.addFieldError("username", "username or password error");
return "failer";
}

} @Override
public void validate() {
if (null == this.getUsername() || "".equals(this.getUsername().trim())) {
this.addFieldError("username", "username required");
}
if (null == this.getPassword() || "".equals(this.getPassword().trim())) {
this.addFieldError("password", "password required");
}

}}
login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'login.jsp' starting page</title>
    
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">    
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->  </head>
  
  <body>
  <form action="login.action" method="post">
  username:<input type="text" name="username"><br>
  password:<input type="password" name="password"><br>
  <input type ="submit" value="submit">
  </form>
  </body>
</html>导入common-logging-1.0.4.jar,freeer=2.3.8.jar
ognl-2.6.11.jar,xwork-2.0.5.jar
struts2-core-2.0.11.2.jar,这五个包就可以了
struts.xml这个文件放在src根目录下

Answer 3

struts.xml文件有错误。仔细检查一下罗！

Answer 4

是Struts2与Spring结合出现的错误喽,检查下在你的Struts.properties文件中是否定义如下两个常量:
struts.objectFactory.spring.autoWire=type
struts.objectFactory=spring当前也可以直接定义到struts.xml文件中,如:
<constant name="struts.objectFactory.spring.autoWire" value="type"></constant>
<constant name="struts.objectFactory" value="spring"></constant>另外检查你Spring的jar包是否添加够了,一定要加上Spring Web Libraries最后再看你的web.xml中是否定义了Spring的Context以及Struts2的FilterDispatcher
参考如下:<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
classpath:applicationContext*.xml
,classpath:com/sinotrans/**/applicationContext-*.xml
</param-value>
</context-param> <filter>
<filter-name>struts2</filter-name>
<filter-class>
org.apache.struts2.dispatcher.FilterDispatcher
</filter-class>
<init-param>
<param-name>actionPackages</param-name>
<param-value>com.sinotrans</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> <listener>
<listener-class>
org.springframework.web.context.ContextLoaderListener
</listener-class>
</listener>
</web-app>