小弟拼死也弄不明白关于

usebean出错了

<%@ page language="java" contentType="text/html;charset=gb2312"%>
<jsp:useBean id="user" scope="page" class="com.jspdev.ch3.TestBean"/>
<jsp:setProperty name="user" property="userName" param="UserName"/>
<jsp:setProperty name="user" property="password" param="password"/>
<jsp:setProperty name="user" property="age" param="age"/>


注册成功：<br>
<hr>
使用bean属性方法：<br>
用户名：<%=user.getUserName() %><br>
密码：<%=user.getPassword() %><br>
年龄：<%=user.getAge()%><br>
<hr>
使用getProperty:<br>
用户名：<jsp:getProperty name="user" property="userName"/><br>
密码：<jsp:getProperty name="user" property="password"/><br>
年龄：<jsp:getProperty name="user" property="age"/><br>





这是网业,usebean为

ackage com.jspdev.ch3;

public class TestBean
{
public String userName;
public String password;
public int age;

public void setUserName(String name)
{
this.userName=name;
}
public void setPassword(String password)

{
this.password=password;
}
public String getUserName()
{
return this.userName;
}
public String getPassword()
{
return password;
}
public int getAge()
{
return this.age;
}
public void setAge(int age)
{
this.age=age;
}
}








可是结果为:

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: com.jspdev.ch3.TestBean
at org.apache.jasper.compiler.BeanRepository.getBeanType(BeanRepository.java:135)
at org.apache.jasper.compiler.Generator＄GenerateVisitor.visit(Generator.java:650)
at org.apache.jasper.compiler.Node＄GetProperty.accept(Node.java:507)
at org.apache.jasper.compiler.Node＄Nodes.visit(Node.java:983)
at org.apache.jasper.compiler.Node＄Visitor.visitBody(Node.java:1025)
at org.apache.jasper.compiler.Node＄Visitor.visit(Node.java:1031)
at org.apache.jasper.compiler.Node＄Root.accept(Node.java:187)
at org.apache.jasper.compiler.Node＄Nodes.visit(Node.java:983)
at org.apache.jasper.compiler.Generator.generate(Generator.java:1891)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:427)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:142)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
at org.apache.catalina.core.StandardPipeline＄StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
at org.apache.catalina.core.StandardPipeline＄StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
at org.apache.catalina.core.StandardPipeline＄StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
at org.apache.catalina.core.StandardPipeline＄StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
at org.apache.catalina.core.StandardPipeline＄StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
at org.apache.catalina.core.StandardPipeline＄StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol＄Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool＄ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Unknown Source)


root cause

java.lang.ClassNotFoundException: com.jspdev.ch3.TestBean
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1407)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1252)
at org.apache.jasper.compiler.BeanRepository.getBeanType(BeanRepository.java:133)
at org.apache.jasper.compiler.Generator＄GenerateVisitor.visit(Generator.java:650)
at org.apache.jasper.compiler.Node＄GetProperty.accept(Node.java:507)
at org.apache.jasper.compiler.Node＄Nodes.visit(Node.java:983)
at org.apache.jasper.compiler.Node＄Visitor.visitBody(Node.java:1025)
at org.apache.jasper.compiler.Node＄Visitor.visit(Node.java:1031)
at org.apache.jasper.compiler.Node＄Root.accept(Node.java:187)
at org.apache.jasper.compiler.Node＄Nodes.visit(Node.java:983)
at org.apache.jasper.compiler.Generator.generate(Generator.java:1891)
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:427)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:142)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:240)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:187)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:809)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:200)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:146)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:209)
at org.apache.catalina.core.StandardPipeline＄StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:144)
at org.apache.catalina.core.StandardPipeline＄StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2358)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:133)
at org.apache.catalina.core.StandardPipeline＄StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:118)
at org.apache.catalina.core.StandardPipeline＄StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:116)
at org.apache.catalina.core.StandardPipeline＄StandardPipelineValveContext.invokeNext(StandardPipeline.java:594)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:127)
at org.apache.catalina.core.StandardPipeline＄StandardPipelineValveContext.invokeNext(StandardPipeline.java:596)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:433)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:948)
at org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.java:152)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol＄Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool＄ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Unknown Source)


这是什么错误!