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。：（

显示全部楼层 · 2008-12-14 19:19:40

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.(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:

/HelloWorld.jsp

HelloWorld.jsp:

Struts 2 示例

${message}

HelloWorld.java:
package example;
import com.opensymphony.xwork2.ActionSupport;
public class HelloWorld extends ActionSupport {

public String execute() throws Exception {

setMessage("你好！Struts 2！&quot

;

return SUCCESS;

}

private String message;

public String getMessage() {

return message;

}

public void setMessage(String message) {

this.message = message;

}
}

web.xml:

struts2

org.apache.struts2.dispatcher.FilterDispatcher

struts2

/*

index.jsp

千问 · 2008-12-14 19:19:40

从报错信息看应该是缺少xwork2的jar包

千问 · 2008-12-14 19:19:40

自己学这看看，不要以为是新手，就可以随便问
Unable to load bean: type: class:com.opensymphony.xwork2.ObjectFactory 不是告诉你了吗？

千问 · 2008-12-14 19:19:40

自己要有troubleshooting的能力

千问 · 2008-12-14 19:19:40

Caused by: Bean type class com.opensymphony.xwork2.ObjectFactory with the name xwork has already been loaded by bean
D:/Java/tomcat6016/lib/struts2-core-2.0.14.jar
D:/Java/tomcat6016/webapps/struts2hello/WEB-INF/lib/struts2-core-2.0.14.jar
删除其中一个jar文件试试

千问 · 2008-12-14 19:19:40

to justforregister: 对不起。我对JAVA现在还处于混乱当中。你是老手是否应该多点包容心呢？你的英语很厉害。我要向你学习。谢谢。
感谢baggio0105和ning0629，
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？
谢谢三位。
[ 本帖最后由 miaomiaoga 于 2008-12-15 17:04 编辑 ]

千问 · 2008-12-14 19:19:40

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。：）
再次谢谢三位。：）

千问 · 2008-12-14 19:19:40

03年就注册了，怎么还是新手

千问 · 2008-12-14 19:19:40

这。。。偶。。。一直。。。玩。。。ASP.NET.。。所以。。。。
更郁闷了....

千问 · 2008-12-14 19:19:40

和猪谈问题!没意思!虽然本人也是....