org.hibernate.PropertyValueException：not-null属性引用null或transient值：com.Attendance.Batch.BCode

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org.hibernate.PropertyValueException：not-null属性引用null或transient值：com.Attendance.Batch.BCode我需要在数据库中以struts2的简单方式插入数据

Batch.java // pojo类

package com.Attendance;

import javax.persistence.*;


@Entity
@Table(name="BatchTimeTable")
public class Batch{
@Id
@GeneratedValue
@Column(name="id")
private int id;
@Column(name="Batch_Code",unique=true,nullable = false)
private String BCode;
@Column(name="ClassRoom",nullable = false)
private String CRoom;
@Column(name="Batch_Time",nullable = false)
private String BTime;
@Column(name="Class_Name",nullable = false)
private String CName;


//getter and setter

BatchADD.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE html PUBLIC>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<link rel="stylesheet" href="Navbar.css">
<link rel="stylesheet" href="AStyle.css">
<script type="text/javascript" src="Script.js">

</script>
<link href="<s:url value ="/css/AStyle.css"/>" rel="stylesheet"
    type="text/css" />
<title>BATCH</title>
</head>
<body>

    <%
        String Name = (String) session.getAttribute("name");
    %>
        <s:form action="BatchInserting">
        <table>
        <tr>
        <td>
        <s:textfield name="BCode" label="Batch Code"/></td></tr>
        <tr>
        <td>
        <s:textfield name="CRoom" label="LAB/ClassRoom"/></td></tr>
        <tr>
        <td><s:textfield name="BTime" label="Lecturer Time" /></td></tr>                
        <tr>
        <td>
        <s:hidden value="%{#session['name']}" name="CName" /></td</tr>
        <tr>
        <td>
        <s:submit value="Insert New Batch"></s:submit></td></tr>
        </table>
        </s:form>
</body></html>

BatchAction.java // Action类

package com.Attendance;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;


@SuppressWarnings("serial")
public class BatchAction extends ActionSupport implements ModelDriven<Batch>{

    private Batch b=new Batch();

    @Override
    public Batch getModel() {
        // TODO Auto-generated method stub
        return null;
    }

    public String saveB() {

        boolean ba=DaoBatch.save(b);
        if(ba==true) {
            System.out.println("Inserting");
        return SUCCESS;
        }
        return ERROR;
    }

}

DAO batch.Java

package com.Attendance;


import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class DaoBatch {

    public static boolean save(Batch b){
        boolean flag=true;

        SessionFactory factory= new Configuration().configure().buildSessionFactory();
        Session session=factory.openSession();
        Transaction tx=session.beginTransaction();
        try {
            session.save(b);
            tx.commit();
        }catch(Exception e) {
        flag=false;
            e.printStackTrace();
        }
        session.close();    
        return flag;
    }

}

在struts.xml


<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>                        




    <package name="com.Attendance" extends="struts-default">
                <!--Batch model-->
            <action name="BatchInserting" class="com.Attendance.BatchAction" method="saveB">
        <result name="success">/Admin/success.jsp</result>
        <result name="error">/Admin/RegistrationTeacher.jsp</result>
        <result name="input">/Admin/RegistrationTeacher.jsp</result>
        </action>           
                <!--Teacher model-->
        <action name="RegTeacher" class="com.Attendance.TeacherAction" method="save">
        <result name="success">/Admin/success.jsp</result>
        <result name="error">/Admin/RegistrationTeacher.jsp</result>
        <result name="input">/Admin/RegistrationTeacher.jsp</result>
        </action>

        <action name="Show" class="com.Attendance.TeacherAction" method="List">
        <result name="success">/Admin/ShowAllTeacher.jsp</result>
        <result name="input">/Admin/ShowAllTeacher.jsp</result>
        </action>

        <action name="EditTeacher" class="com.Attendance.TeacherAction" method="FindById">
        <result name="success">/Admin/UDTeacher.jsp</result>
        <result name="input">/Admin/ShowAllTeacher.jsp</result>
        </action>

        <action name="UDTeacher" class="com.Attendance.TeacherAction" method="Update">
        <result name="success">/Admin/success.jsp</result>
        <result name="error">/Admin/UDTeacher.jsp</result>
        <result name="input">/Admin/UDTeacher.jsp</result>
        </action>

        <action name="Delete" class="com.Attendance.TeacherAction" method="Delete">
        <result name="success">/Admin/success.jsp</result>
        <result name="error">/Admin/Show.jsp</result>
        <result name="input">/Admin/Show.jsp</result>
        </action>

        <action name="LoginTeacher" class="com.Attendance.TeacherAction" method="LoginT">
        <result name="success">/Teacher/HomeT.jsp</result>
        <result name="error">/Teacher/LoginTeacher.jsp</result>
        <result name="input">/Teacher/LoginTeacher.jsp</result>
        </action>

        <action name="logout" class="com.Attendance.TeacherAction" method="logout">
        <result name="success">/Teacher/CheckLoginT.jsp</result>
        </action>



    </package>

    <constant name="struts.action.excludePattern" value="/CheckCode,/CheckRegistrationAdmin,/LoginAdmin,"/>
</struts>

的hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

    <hibernate-configuration>

<session-factory>

<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url"> jdbc:mysql://localhost:3306/attendance</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>

<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.hbm2ddl.auto">update</property>

 <!-- List of XML mapping files -->
<mapping class="com.Attendance.RegistrationAdmin"/>
<mapping class="com.Attendance.DaoAdmin"/>
<mapping class="com.Attendance.RegTeacher"/>
<mapping class="com.Attendance.DaoTeacher"/>
<mapping class="com.Attendance.Batch"/>
<mapping class="com.Attendance.DaoBatch"/>

</session-factory>

</hibernate-configuration>

错误

org.hibernate.PropertyValueException: not-null property references a null or transient value: com.Attendance.Batch.BCode
    at org.hibernate.engine.Nullability.checkNullability(Nullability.java:100)
    at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:312)
    at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203)
    at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210)
    at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195)
    at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50)
    at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93)
    at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:713)
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:701)
    at org.hibernate.impl.SessionImpl.save(SessionImpl.java:697)
    at com.Attendance.DaoBatch.save(DaoBatch.java:18)
    at com.Attendance.BatchAction.saveB(BatchAction.java:20)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

我需要在数据库中简单插入数据

答案

我收到了错误 getmodel（）{是一个空值返回null;}这是错误的，所以返回b; b是对象Batch

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