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简单JavaBean调用老实失败，请兄弟们指教

AaronTong

发贴: 12

于 2007-11-23 10:16

我的代码是《白领就业指南：J2EE开发员成长之路》一书上原版抄过来的，感觉部署都没问题，但是运行的时候老提示错误，我是新手解决不了，已经困惑我好几天了，请指教啊
TaxRate.java如下：
package tax;
public class TaxRate {
String product;
double rate;
public TaxRate(){
this.product = "A001";
this.rate = 5;
}
public void setProduct (String ProductName) {
this.product = ProductName;
}
public String getProduct() {
return (this.product);
}
public void setRate (double rateValue) {
this.rate = rateValue;
}
public double getRate () {
return (this.rate);
}
}
JSP如下：
<HTML>
<BODY>
<%@ page language="java" %>
<jsp:useBean id="taxbean" scope="application" class="tax.TaxRate" />
<% taxbean.setProduct("A002");
taxbean.setRate(17);
%>
产品:<%=taxbean.getProduct() %> <br>
税率:<%=taxbean.getRate() %>
</BODY>
</HTML>
部署如下：TaxRate.java编译后的class文件放在D:\Tomcat5.5\webapps\ROOT\useBean\WEB-INF\classes\tax下。 JSP文件在D:\Tomcat5.5\webapps\ROOT\useBean下。

运行后提示错误：
org.apache.jasper.JasperException: /useBean/UseBean.jsp(4,0) The value for the useBean class attribute tax.TaxRate is invalid.
  org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:512)
  org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
  org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
  org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
  javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

org.apache.jasper.JasperException: /useBean/UseBean.jsp(4,0) The value for the useBean class attribute tax.TaxRate is invalid.
  org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
  org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:405)
  org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:146)
  org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1174)
  org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1116)
  org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
  org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
  org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
  org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
  org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
  org.apache.jasper.compiler.Generator.generate(Generator.java:3320)
  org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:198)
  org.apache.jasper.compiler.Compiler.compile(Compiler.java:295)
  org.apache.jasper.compiler.Compiler.compile(Compiler.java:276)
  org.apache.jasper.compiler.Compiler.compile(Compiler.java:264)
  org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:563)
  org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:305)
  org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
  org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
  javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.20 logs.
请兄弟们指教啊，在线等

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话题树型展开

人气	标题	作者	字数	发贴时间
3121	简单JavaBean调用老实失败，请兄弟们指教	AaronTong	3136	2007-11-23 10:16
2475	Re:简单JavaBean调用老实失败，请兄弟们指教	AaronTong	414	2007-11-23 10:43
2207	Re:简单JavaBean调用老实失败，请兄弟们指教	无行	146	2007-11-24 10:35
2475	Re:简单JavaBean调用老实失败，请兄弟们指教	AaronTong	16	2007-11-24 15:21
2585	Re:简单JavaBean调用老实失败，请兄弟们指教	AaronTong	44	2007-12-07 14:48

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