JavaBeans疑惑

type Exception reportmessagedescription The server encountered an internal error () that prevented it from fulfilling this request.exceptionorg.apache.jasper.JasperException: /usebean.jsp(14,0) The value for the useBean class attribute cn.ac.ict.SimpleBean is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1231)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1178)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2411)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2417)
org.apache.jasper.compiler.Node$Root.accept(Node.java:495)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361)
org.apache.jasper.compiler.Generator.generate(Generator.java:3442)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:231)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:347)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:327)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:326)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.32 logs.
是什么问题呀？请高手指导！！！

解决方案 »

免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货

cn.ac.ict.SimpleBean是什么东东把你jsp中涉及到javabean的那段代码晒出来看下
另外：这个问题应该放到Java大版块里
我刚接触Java web 拿书上的例子来练，总是出问题         cn.ac.ict.SimpleBean 内容是package cn.ac.ict;
public class SimpleBean
{
private String message;
public String getMessage(){
return message ;
}
public void setMessage(String mess){
message=mess;
}
}
谢谢指导。
我刚接触Java web 拿书上的例子来练，总是出问题 cn.ac.ict.SimpleBean 内容是package cn.ac.ict;
public class SimpleBean
{
private String message;
public String getMessage(){
return message ;
}
public void setMessage(String mess){
message=mess;
}
}
谢谢指导。
不看javabean的把jsp的代码发下
The value for the useBean class attribute cn.ac.ict.SimpleBean is invalid.
可能你那里边没引javabean 或是方法在bean实体中没有定义
jsp代码：
<%@ page contentType="text/html;charset=gb2312"%>
<HTML>
<HEAD>
<TITLE>Reusing JavaBeans in JSP</TITLE>
</HEAD>
<BODY>
<CENTER>
<TABLE BORDER=1>
<TR><TH>在JSP页面中重用JavaBeans组建</th></tr>
</TABLE>
</CENTER>
<P>

<jsp:useBean id="test" class="cn.ac.ict.SimpleBean"/>

<jsp:setProperty name="test" property="message" value="欢迎使用JavaBeans组件"/>
<H1>从JavaBeans组件获得一个属性消息：

<jsp:getProperty name="test" property="message"/>
</H1>
</BODY>
</HTML>
试试看, 在
<%@ page contentType="text/html;charset=gb2312"%>
之前加入
<%@ page language="java" import="...这里引入你的需要的包..."%>
jsp代码中bean的使用没什么问题
这个cn.ac.ict.SimpleBean是表示你的类的在工程里的路径你看下你写的对么？肯定没写对
javabean的应用不需要引这个
它需要在bean标签里指定这个bean类的路径
我加入上面代码后，错误变成了：type Exception reportmessagedescription The server encountered an internal error () that prevented it from fulfilling this request.exceptionorg.apache.jasper.JasperException: org.apache.jasper.JasperException: Unable to load class for JSP
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:161)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:338)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root causeorg.apache.jasper.JasperException: Unable to load class for JSP
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:630)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:149)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:338)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root causejava.lang.ClassNotFoundException: org.apache.jsp.usebean_jsp
java.net.URLClassLoader$1.run(Unknown Source)
java.security.AccessController.doPrivileged(Native Method)
java.net.URLClassLoader.findClass(Unknown Source)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:134)
org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:66)
org.apache.jasper.JspCompilationContext.load(JspCompilationContext.java:628)
org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:149)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:338)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.32 logs.是不是usebean.jsp和SimpleBean.class 的位置放错了我把它们都放到 root文件里了。
当然不能随意指定了呵呵
jsp里使用bean 它肯定要去找你这个bean的属性定义在哪个.java文件中
比如：
<jsp:setProperty name="test" property="message" value="欢迎使用JavaBeans组件"/>
这个属性假设是在aaa.java中定义的那么你的<jsp:useBean id="test" class="写aaa.java在你工程下的路径"/>这说的够细的明白了么？
我改了路径但还是有错误：org.apache.jasper.JasperException：/ usebean.jsp（15,0）useBean的阶级属性dele1.SimpleBean的值是无效的。不过还是挺感谢你的！