【发布时间】：2015-09-12 05:32:07
【问题描述】：
从以下链接执行简单的休眠程序时出现以下错误 http://www.tutorialspoint.com/hibernate/hibernate_examples.htm
创建 sessionFactory object.org.hibernate.MappingException 失败： 无法从资源中读取映射：Employee.hbm.xml 中的异常 线程“主”java.lang.ExceptionInInitializerError 在 ManageEmployee.main(ManageEmployee.java:21) 原因： org.hibernate.MappingException：无法从资源中读取映射： Employee.hbm.xml 在 org.hibernate.cfg.Configuration.addResource(Configuration.java:484) 在 org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1453) 在 org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1421) 在 org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1402) 在 org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1378) 在 org.hibernate.cfg.Configuration.configure（Configuration.java:1298） 在 org.hibernate.cfg.Configuration.configure(Configuration.java:1284) 在 ManageEmployee.main(ManageEmployee.java:18) 引起： org.hibernate.MappingException：无法解析映射文档 输入流在 org.hibernate.cfg.Configuration.addInputStream(Configuration.java:430) 在 org.hibernate.cfg.Configuration.addResource(Configuration.java:481) ... 7 更多原因：org.dom4j.DocumentException：www.hibernate.org 嵌套异常：www.hibernate.org at org.dom4j.io.SAXReader.read(SAXReader.java:484) 在 org.hibernate.cfg.Configuration.addInputStream(Configuration.java:421) ... 8 更多
Employee.java
public class Employee {
private int id;
private String firstName;
private String lastName;
private int salary;
public Employee() {}
public Employee(String fname, String lname, int salary) {
this.firstName = fname;
this.lastName = lname;
this.salary = salary;
}
public int getId() {
return id;
}
public void setId( int id ) {
this.id = id;
}
public String getFirstName() {
return firstName;
}
public void setFirstName( String first_name ) {
this.firstName = first_name;
}
public String getLastName() {
return lastName;
}
public void setLastName( String last_name ) {
this.lastName = last_name;
}
public int getSalary() {
return salary;
}
public void setSalary( int salary ) {
this.salary = salary;
}
}
ManageEmployee.java
import java.util.List;
import java.util.Date;
import java.util.Iterator;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class ManageEmployee {
private static SessionFactory factory;
public static void main(String[] args) {
try{
factory = new Configuration().configure().buildSessionFactory();
}catch (Throwable ex) {
System.err.println("Failed to create sessionFactory object." + ex);
throw new ExceptionInInitializerError(ex);
}
ManageEmployee ME = new ManageEmployee();
/* Add few employee records in database */
Integer empID1 = ME.addEmployee("Zara", "Ali", 1000);
Integer empID2 = ME.addEmployee("Daisy", "Das", 5000);
Integer empID3 = ME.addEmployee("John", "Paul", 10000);
/* List down all the employees */
ME.listEmployees();
/* Update employee's records */
ME.updateEmployee(empID1, 5000);
/* Delete an employee from the database */
ME.deleteEmployee(empID2);
/* List down new list of the employees */
ME.listEmployees();
}
/* Method to CREATE an employee in the database */
public Integer addEmployee(String fname, String lname, int salary){
Session session = factory.openSession();
Transaction tx = null;
Integer employeeID = null;
try{
tx = session.beginTransaction();
Employee employee = new Employee(fname, lname, salary);
employeeID = (Integer) session.save(employee);
tx.commit();
}catch (HibernateException e) {
if (tx!=null) tx.rollback();
e.printStackTrace();
}finally {
session.close();
}
return employeeID;
}
/* Method to READ all the employees */
public void listEmployees( ){
Session session = factory.openSession();
Transaction tx = null;
try{
tx = session.beginTransaction();
List employees = session.createQuery("FROM Employee").list();
for (Iterator iterator =
employees.iterator(); iterator.hasNext();){
Employee employee = (Employee) iterator.next();
System.out.print("First Name: " + employee.getFirstName());
System.out.print(" Last Name: " + employee.getLastName());
System.out.println(" Salary: " + employee.getSalary());
}
tx.commit();
}catch (HibernateException e) {
if (tx!=null) tx.rollback();
e.printStackTrace();
}finally {
session.close();
}
}
/* Method to UPDATE salary for an employee */
public void updateEmployee(Integer EmployeeID, int salary ){
Session session = factory.openSession();
Transaction tx = null;
try{
tx = session.beginTransaction();
Employee employee =
(Employee)session.get(Employee.class, EmployeeID);
employee.setSalary( salary );
session.update(employee);
tx.commit();
}catch (HibernateException e) {
if (tx!=null) tx.rollback();
e.printStackTrace();
}finally {
session.close();
}
}
/* Method to DELETE an employee from the records */
public void deleteEmployee(Integer EmployeeID){
Session session = factory.openSession();
Transaction tx = null;
try{
tx = session.beginTransaction();
Employee employee =
(Employee)session.get(Employee.class, EmployeeID);
session.delete(employee);
tx.commit();
}catch (HibernateException e) {
if (tx!=null) tx.rollback();
e.printStackTrace();
}finally {
session.close();
}
}
}
Employee.hbm.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Employee" table="EMPLOYEE">
<meta attribute="class-description">
This class contains the employee detail.
</meta>
<id name="id" type="int" column="id">
<generator class="sequence"/>
</id>
<property name="firstName" column="first_name" type="string"/>
<property name="lastName" column="last_name" type="string"/>
<property name="salary" column="salary" type="int"/>
</class>
</hibernate-mapping>
hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate- configuration-3.0.dtd">
<hibernate-configuration>
<session-factory name="sessionFactory">
<!-- Database connection settings -->
<property name="connection.driver_class">com.ibm.db2.jcc.DB2Driver</property>
<property name="connection.url">jdbc:db2://172.18.75.21:60008/tinuat</property>
<!-- <property name="connection.driver_class">net.sf.log4jdbc.DriverSpy</property>
<property name="connection.url">jdbc:log4jdbc:postgresql://172.19.65.152:5432/NIR</property>-->
<property name="connection.username">samol</property>
<property name="connection.password">samolteam</property>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">30</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.DB2Dialect</property>
<!-- Enable Hibernate's automatic session context management -->
<property name="current_session_context_class">thread</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="hibernate.connection.release_mode">auto</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- Drop and re-create the database schema on startup -->
<property name="hbm2ddl.auto">false</property>
<mapping resource="Employee.hbm.xml"/>
</session-factory>
</hibernate-configuration>
【问题讨论】：
-
分享你的项目文件结构
-
您将
Employee.hbm.xml文件放在哪里？ -
你可以从这个链接下载我的项目myslams.com/test/hibernate.zip