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第一个HelloWorld的Struts2程序出错了。请大家看一下是什么问题。感谢。感谢。：（

miaomiaoga

发贴: 26
积分: 0

于 2008-12-15 02:36

程序在部署后，在TOMCAT里看到的错误是(localhost.2008-12-14.log)：

2008-12-14 19:19:40 org.apache.catalina.core.StandardContext filterStart
严重: Exception starting filter struts2
Unable to load bean: type: class:com.opensymphony.xwork2.ObjectFactory - bean - jar:file:/D:/Java/tomcat6016/webapps/struts2hello/WEB-INF/lib/struts2-core-2.0.14.jar!/struts-default.xml:30:72
  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.FilterDispatcher.init(FilterDispatcher.java:205)
  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.manager.ManagerServlet.start(ManagerServlet.java:1244)
  at org.apache.catalina.manager.HTMLManagerServlet.start(HTMLManagerServlet.java:604)
  at org.apache.catalina.manager.HTMLManagerServlet.doGet(HTMLManagerServlet.java:129)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:690)
  at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
  at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:525)
  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
  at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:856)
  at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:565)
  at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1509)
  at java.lang.Thread.run(Unknown Source)
Caused by: Bean type class com.opensymphony.xwork2.ObjectFactory with the name xwork has already been loaded by bean - jar:file:/D:/Java/tomcat6016/lib/struts2-core-2.0.14.jar!/struts-default.xml:30:72 - bean - jar:file:/D:/Java/tomcat6016/webapps/struts2hello/WEB-INF/lib/struts2-core-2.0.14.jar!/struts-default.xml:30:72
  at com.opensymphony.xwork2.config.providers.XmlConfigurationProvider.register(XmlConfigurationProvider.java:193)
  ... 29 more

以下是程序代码：
struts2.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="default" extends="struts-default">
    
    <action name="HelloWorld" class="example.HelloWorld">
      <result name="success">/HelloWorld.jsp</result>
    </action>
  </package>
</struts>

HelloWorld.jsp:

<%@ page contentType="text/html; charset=GBK"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
  <head>
    <title>Struts 2 示例</title>
  </head>
  <body>
    <h2>
      <s:property value="message" />
    </h2>
    ${message}
  </body>
</html>

HelloWorld.java:

package example;

import com.opensymphony.xwork2.ActionSupport;

public class HelloWorld extends ActionSupport {
  public String execute() throws Exception {
    setMessage("你好！Struts 2！");
    return SUCCESS;
  }

  private String message;

  public String getMessage() {
    return message;
  }

  public void setMessage(String message) {
    this.message = message;
  }
}

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>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

（缩略图，点击图片链接看原图）

作者	Re:第一个HelloWorld的Struts2程序出错了。请大家看一下是什么问题。感谢。感谢。：（ [Re:miaomiaoga]
xuxiaolei ^_^ 发贴: 169 积分: 23	于 2008-12-15 07:57 帮你搜索了下这个问题，http://marc.info/?l=struts-user&m=121364285702256&w=2 http://xuxiaolei.javaeye.com

作者	Re:第一个HelloWorld的Struts2程序出错了。请大家看一下是什么问题。感谢。感谢。：（ [Re:miaomiaoga]
miaomiaoga 发贴: 26 积分: 0	于 2008-12-15 16:24 我看了一下。好像是说我在系统里已经有了另外一个不同版本（或者相同版本）的struts2 core .jar 。的确是这样。但是我把我原来拷贝到TOMCAT\LIB下的struts2的那些jar删除后。也不行哦。究竟是什么回事呢？郁闷ing...

作者	Re:第一个HelloWorld的Struts2程序出错了。请大家看一下是什么问题。感谢。感谢。：（ [Re:miaomiaoga]
miaomiaoga 发贴: 26 积分: 0	于 2008-12-15 17:03 成功了成功了，我用MYECLIPSE CLEAN了一下。然后再重新部署。再把TOMCAT重起一下。就好了。（访问的文件名还分大小写的哦？）谢谢。：）

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