今天做了一个很小的web项目，但最后出现的异常让人头皮发麻，最后通过多方查询，最准调试成功，现在将经验分享给大家，希望可以帮到大家；
1、javax.el.PropertyNotFoundException: Property 'XXX' not found on type java.lang.String
stuinfo.jsp页面内容如下：
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<table border="1px" width="100%">
<tr align="center">
<td>编号</td>
<td>姓名</td>
<td>性别</td>
<td>电话</td>
<td>生日</td>
<td>爱好</td>
<td>简介</td>
<td>操作</td>
</tr>
<c:forEach items="list" var="stu">
<tr>
<td>${stu.sid}</td>
<td>${stu.sname}</td>
<td>${stu.sgender}</td>
<td>${stu.phone}</td>
<td>${stu.birthday}</td>
<td>${stu.hoby}</td>
<td>${stu.info}</td>
<td><a href="#">更新</a>><a href="#">删除</a>></td>
</tr>
</c:forEach>
</table>
</body>
</html>
原因：<c:forEach items="list" var="stu">
解决方式：items的值应该用EL表达式,因此修改为<c:forEach items="${list}" var="stu">,注意括号里不要有空格，var为循环变量。
2、javax.el.PropertyNotFoundException: Property 'hoby' not found on type StuBean.Student
Student.java代码如下：
import java.util.Date; public class Student { private int sid; private String sname; private String sgender; private String phone; private String hoby; private String info; private Date birthday; public Student(){ } public Student(int sid, String sname, String sgender, String phone,String hoby, String info, Date birthday) { super(); this.sid = sid; this.sname = sname; this.sgender = sgender; this.phone = phone; this.info = info; this.birthday = birthday; } public int getSid() { return sid; } public void setSid(int Sid) { this.sid = sid; } public String getSname() { return sname; } public void setSname(String sname) { this.sname = sname; } public String getSgender() { return sgender; } public void setSgender(String sgender) { this.sgender = sgender; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } public String getInfo() { return info; } public void setInfo(String info) { this.info = info; } public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } }
数据库如下：
原因：student.java中缺少变量，无法完全接受查询到的数据；
解决方式：添加hoby字段，以及hoby字段的对应的getter和settr方法（构造方法中也要添加该变量）；如果javabean声明出错，修改后还是同样的错误，建议重新生成一下(因为我出现了这样的问题)。
注意:在数据库中create table student( sid int,sname varchar(20) )对应的Student类变量private Int sid; private String sname;其中类型需要一致，同时设置getter和setter方法;
private String hoby; public String getHoby() { return hoby; } public void setHoby(String hoby) { this.hoby = hoby; }
3、java.sql.SQLException: Cannot create StuBean.Student: StuBean.Student Query: select * from stu Parameters: []
原因：Student.java中缺少无参的构造函数。添加无参构造函数即可。
欢迎大家补充交流。