jsp文件如下：
<%@ page language= "java " import= "java.util.* " pageEncoding= "gb2312 "%>
<%@ taglib prefix= "c " uri= "http://java.sun.com/jstl/core " %>
<%@ page contentType= "text/html " %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN ">
<html>
<head>
<title> My JSP 'jsp.jsp ' starting page </title>
</head>
<body>
<form method= "post ">
<jsp:useBean id= "userinfo " class= "myBeans.userInfo " scope= "page ">
</jsp:useBean>
<jsp:getProperty id= "userinfo " property= "userName.getName " />
</form>
</body>
</html>
类文件如下：
package myBeans;
public class userInfo {
private String userName;
public String getName(){
return this.userName;
}
public void setName(String name){
this.userName = name;
}
public userInfo(){
this.userName = "aaa ";
}
}
运行的时候报错：
HTTP Status 500 -
--------------------------------------------
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: /JSTL/jsp.jsp(15,3) GetProperty: Mandatory attribute name missing
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:196)
org.apache.jasper.compiler.JspUtil.checkAttributes(JspUtil.java:283)
org.apache.jasper.compiler.Validator$ValidateVisitor.visit(Validator.java:473)
org.apache.jasper.compiler.Node$GetProperty.accept(Node.java:1062)
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.Validator.validate(Validator.java:1489)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:157)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)