javax.el.ELException:读取Person类型上的[name]时出错

我用hibenate和SpringMVC编写了一个程序，但当我执行编辑功能时，它会给我带来错误

Type Exception Report

Message An exception occurred processing JSP page [/WEB-INF/views/person.jsp] at line [24]

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.apache.jasper.JasperException: An exception occurred processing JSP page [/WEB-INF/views/person.jsp] at line [24]

21: 
22: <form:form action="${addAction}" commandName="person">
23:     <table>
24:         <c:if test="${!empty person.name}">
25:             <tr>
26:                 <td>
27:                     <form:label path="id">


Stacktrace:
    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:584)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:481)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1257)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1037)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

Root Cause

javax.el.ELException: Error reading [name] on type [com.baotrung.entity.Person_$$_jvsta7c_0]
    javax.el.BeanELResolver.getValue(BeanELResolver.java:98)
    org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:110)
    org.apache.el.parser.AstValue.getValue(AstValue.java:169)
    org.apache.el.parser.AstEmpty.getValue(AstEmpty.java:46)
    org.apache.el.parser.AstNot.getValue(AstNot.java:43)
    org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
    org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:944)
    org.apache.jsp.WEB_002dINF.views.person_jsp._jspx_meth_c_005fif_005f0(person_jsp.java:325)
    org.apache.jsp.WEB_002dINF.views.person_jsp._jspx_meth_form_005fform_005f0(person_jsp.java:247)
    org.apache.jsp.WEB_002dINF.views.person_jsp._jspService(person_jsp.java:170)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1257)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1037)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

Root Cause

org.hibernate.LazyInitializationException: could not initialize proxy - no Session
    org.hibernate.proxy.AbstractLazyInitializer.initialize(AbstractLazyInitializer.java:147)
    org.hibernate.proxy.AbstractLazyInitializer.getImplementation(AbstractLazyInitializer.java:260)
    org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:68)
    com.baotrung.entity.Person_$$_jvsta7c_0.getName(Person_$$_jvsta7c_0.java)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.lang.reflect.Method.invoke(Method.java:498)
    javax.el.BeanELResolver.getValue(BeanELResolver.java:94)
    org.apache.jasper.el.JasperELResolver.getValue(JasperELResolver.java:110)
    org.apache.el.parser.AstValue.getValue(AstValue.java:169)
    org.apache.el.parser.AstEmpty.getValue(AstEmpty.java:46)
    org.apache.el.parser.AstNot.getValue(AstNot.java:43)
    org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184)
    org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:944)
    org.apache.jsp.WEB_002dINF.views.person_jsp._jspx_meth_c_005fif_005f0(person_jsp.java:325)
    org.apache.jsp.WEB_002dINF.views.person_jsp._jspx_meth_form_005fform_005f0(person_jsp.java:247)
    org.apache.jsp.WEB_002dINF.views.person_jsp._jspService(person_jsp.java:170)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
    org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
    org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
    org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1257)
    org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1037)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:980)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:635)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:742)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

控制器类

package com.baotrung.controller;

import com.baotrung.entity.Person;
import com.baotrung.services.PersonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
public class PersonController {

    private PersonService personService;

    @Autowired(required = true)

    public void setPersonService(PersonService personService) {
        this.personService = personService;
    }

    @RequestMapping(value ="/persons",method = RequestMethod.GET)
    public String listPersons(Model model){
        model.addAttribute("person",new Person());
        model.addAttribute("listPersons",this.personService.listPerson());
        return "person";
    }

    @RequestMapping(value ="/person/add",method = RequestMethod.POST)
    public String addPerson(@ModelAttribute("person")Person p){
        if(p.getId()==0){
            this.personService.addPerson(p);
        }else{
            this.personService.updatePerson(p);
        }
        return "redirect:/persons";
    }
    @RequestMapping("/edit/{id}")
    public String editPerson(@PathVariable("id")int id,Model model){
        model.addAttribute("person",this.personService.getPersonById(id));
        model.addAttribute("listPersons",this.personService.listPerson());
        return "person";
    }
    @RequestMapping("/remove/{id}")
    public String removePerson(@PathVariable("id")int id){
        this.personService.removePerson(id);
        return "redirect:/persons";
    }

}

人刀

package com.baotrung.dao;

import com.baotrung.entity.Person;
import org.hibernate.Session;
import org.hibernate.SessionFactory;


import java.util.List;



public class PersonDAOImpl implements PersonDAO {
    private SessionFactory sessionFactory;

    public void setSessionFactory(SessionFactory sessionFactory) {
        this.sessionFactory = sessionFactory;
    }

    @Override
    public void addPerson(Person p) {
        Session session = this.sessionFactory.getCurrentSession();
        session.persist(p);

    }

    @Override
    public void updatePerson(Person p) {
        Session session = this.sessionFactory.getCurrentSession();
        session.update(p);

    }
    @SuppressWarnings("unchecked")
    @Override
    public List<Person> listPerson() {
        Session session = this.sessionFactory.getCurrentSession();
        List<Person> personList = session.createQuery("from Person").list();
        return personList;
    }

    @Override
    public Person getPersonById(int id) {
        Session session = this.sessionFactory.getCurrentSession();
        Person p = (Person) session.load(Person.class,new Integer(id));
        return p;
    }

    @Override
    public void removePerson(int id) {
        Session session = this.sessionFactory.getCurrentSession();
        Person p = (Person)session.load(Person.class,new Integer(id));
        if(null!=p){
            session.delete(p);
        }
    }
}

package com.baotrung.dao；
导入com.baotrung.entity.Person；
导入org.hibernate.Session；
导入org.hibernate.SessionFactory；
导入java.util.List；
公共类persondaimpl实现PersonDAO{
私人会话工厂会话工厂；
public void setSessionFactory（SessionFactory SessionFactory）{
this.sessionFactory=sessionFactory；
}
@凌驾
公众人士（p人）{
会话会话=this.sessionFactory.getCurrentSession（）；
会议记录（p）；
}
@凌驾
公共作废更新人员（p人）{
会话会话=this.sessionFactory.getCurrentSession（）；
更新（p）；
}
@抑制警告（“未选中”）
@凌驾
公开名单{
会话会话=this.sessionFactory.getCurrentSession（）；
List personList=session.createQuery（“来自个人”）.List（）；
回归人格；
}
@凌驾
公众人物getPersonById（内部id）{
会话会话=this.sessionFactory.getCurrentSession（）；
Person p=（Person）session.load（Person.class，新整数（id））；
返回p；
}
@凌驾
公共无效删除人（内部id）{
会话会话=this.sessionFactory.getCurrentSession（）；
Person p=（Person）session.load（Person.class，新整数（id））；
if（null！=p）{
删除（p）；
}
}
}

个人服务

package com.baotrung.services;

import com.baotrung.dao.PersonDAO;
import com.baotrung.entity.Person;
import org.springframework.transaction.annotation.Transactional;


import java.util.List;

public class PersonServiceImpl implements PersonService {
    private PersonDAO personDAO;

    public void setPersonDAO(PersonDAO personDAO) {
        this.personDAO = personDAO;
    }

    @Override
    @Transactional
    public void addPerson(Person p) {
        this.personDAO.addPerson(p);
    }


    @Override
    @Transactional
    public void updatePerson(Person p) {
        this.personDAO.updatePerson(p);
    }

    @Override
    @Transactional
    public List<Person> listPerson() {
        return this.personDAO.listPerson();
    }

    @Override
    @Transactional
    public Person getPersonById(int id) {
        return this.personDAO.getPersonById(id);
    }

    @Override
    @Transactional
    public void removePerson(int id) {
        this.personDAO.removePerson(id);
    }
}

package com.baotrung.services；
进口com.baotrung.dao.PersonDAO；
导入com.baotrung.entity.Person；
导入org.springframework.transaction.annotation.Transactional；
导入java.util.List；
公共类PersonServiceImpl实现PersonService{
私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人私人；
公共无效设置PersonDAO（PersonDAO PersonDAO）{
this.personDAO=personDAO；
}
@凌驾
@交易的
公众人士（p人）{
这个.personDAO.addPerson（p）；
}
@凌驾
@交易的
公共作废更新人员（p人）{
这个.personDAO.updatePerson（p）；
}
@凌驾
@交易的
公开名单{
返回此.personDAO.listPerson（）；
}
@凌驾
@交易的
公众人物getPersonById（内部id）{
返回此.personDAO.getPersonById（id）；
}
@凌驾
@交易的
公共无效删除人（内部id）{
此.personDAO.removePerson（id）；
}
}

Jsp页面：Person.Jsp

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://www.springframework.org/tags" prefix="spring" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="form" %>
<%@ page session="false" %>
<html>
<head>
    <title>Person Page</title>
    <style type="text/css">
        .tg  {border-collapse:collapse;border-spacing:0;border-color:#ccc;}
        .tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:#ccc;color:#333;background-color:#fff;}
        .tg th{font-family:Arial, sans-serif;font-size:14px;font-weight:normal;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;border-color:#ccc;color:#333;background-color:#f0f0f0;}
        .tg .tg-4eph{background-color:#f9f9f9}
    </style>
</head>
<body>
<h1>
    Add a Person
</h1>
<c:url var="addAction" value="/person/add" ></c:url>

<form:form action="${addAction}" commandName="person">
    <table>
        <c:if test="${!empty person.name}">
            <tr>
                <td>
                    <form:label path="id">
                        <spring:message text="ID"/>
                    </form:label>
                </td>
                <td>
                    <form:input path="id" readonly="true" size="8"  disabled="true" />
                    <form:hidden path="id" />
                </td>
            </tr>
        </c:if>
        <tr>
            <td>
                <form:label path="name">
                    <spring:message text="Name"/>
                </form:label>
            </td>
            <td>
                <form:input path="name" />
            </td>
        </tr>
        <tr>
            <td>
                <form:label path="country">
                    <spring:message text="Country"/>
                </form:label>
            </td>
            <td>
                <form:input path="country" />
            </td>
        </tr>
        <tr>
            <td colspan="2">
                <c:if test="${!empty person.name}">
                    <input type="submit"
                           value="<spring:message text="Edit Person"/>" />
                </c:if>
                <c:if test="${empty person.name}">
                    <input type="submit"
                           value="<spring:message text="Add Person"/>" />
                </c:if>
            </td>
        </tr>
    </table>
</form:form>
<br>
<h3>Persons List</h3>
<c:if test="${!empty listPersons}">
    <table class="tg">
        <tr>
            <th width="80">Person ID</th>
            <th width="120">Person Name</th>
            <th width="120">Person Country</th>
            <th width="60">Edit</th>
            <th width="60">Delete</th>
        </tr>
        <c:forEach items="${listPersons}" var="person">
            <tr>
                <td>${person.id}</td>
                <td>${person.name}</td>
                <td>${person.country}</td>
                <td><a href="<c:url value='/edit/${person.id}' />" >Edit</a></td>
                <td><a href="<c:url value='/remove/${person.id}' />" >Delete</a></td>
            </tr>
        </c:forEach>
    </table>
</c:if>
</body>
</html>

个人页面
.tg{边框折叠：折叠；边框间距：0；边框颜色：#ccc；}
.tg td{字体系列：Arial，无衬线；字体大小：14px；填充：10px 5px；边框样式：实心；边框宽度：1px；溢出：隐藏；分词：正常；边框颜色：#ccc；颜色：#333；背景颜色：#fff；}
.tg th{字体系列：Arial，无衬线；字体大小：14px；字体重量：正常；填充：10px 5px；边框样式：实心；边框宽度：1px；溢出：隐藏；分词：正常；边框颜色：#ccc；颜色：#333；背景颜色：#f0f0；}
.tg.tg-4eph{背景色：#f9f9f9}
添加一个人


人员名单
个人ID
人名
个人国家
编辑
删除
${person.id}
${person.name}
${person.country}

---

我不明白为什么spring找不到property person.name。我亲自设置了setter和getter实体。请帮帮我。谢谢

这个异常并不是发生在你的

Person

类上（顺便说一句，看起来还行），而是发生在为你的类创建的

Hibernate

的

代理对象中，请注意奇怪的类名
Person$$\u jvsta7c\u 0

这是因为当您调用
edit
操作时，调用了方法
getPersonById
，该方法调用

Person p = (Person) session.load(Person.class,new Integer(id));

session.load（）
创建一个值未初始化的
proxy
对象

有关
session.load（）
和
session.get（）
（）

session.load（）


它总是返回一个“代理”（Hibernate术语），而不会命中数据库。在Hibernate中，代理是具有给定标识符的对象
值，其属性尚未初始化，它只是看起来像一个
临时假对象
如果未找到行，它将抛出ObjectNotFoundException

session.get（）


它总是命中数据库并返回真实对象，即表示数据库行的对象，而不是代理
如果未找到行，则返回null

简而言之，请尝试将
session.load（）
更改为
session.get（）
非常感谢。这对我有用。你太棒了。
Person p = (Person) session.load(Person.class,new Integer(id));