Hi !
I'm using Oracle 10, Hibernate3.0 and IDE NetBeans.
When I run my applycation, I'm insert into Database Table some records. And I turn on SQL Navigator to show my data in my datatable(when my app runtime), I saw them(my records above). But, when I closed NetBeans IDE and Show my data again(In SQL Navigator) then my data was loose !!! Why ? Please training for me this problem.
This is my code :

hibernate.cfg.xml
===================================
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

<session-factory>

<!-- Database connection settings -->
<property name="connection.driver_class">oracle.jdbc.OracleDriver</property>
<property name="connection.url">jdbc:oracle:thin:@10.4.0.10:1521:PTUD</property>
<property name="connection.username">SCOTT</property>
<property name="connection.password">tiger</property>

<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>

<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.Oracle10gDialect</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>

<!-- 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">create</property>

<mapping resource="hibernate_lesson_01/Event.hbm.xml"/>

</session-factory>

</hibernate-configuration>

Persitan Class Task.java :
==================================
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package firsthibernate.persitans;

import java.io.Serializable;

public class Task implements Serializable{
private int id = 0;
private String taskname = "";
private boolean status = false;

public Task(){

}
public Task(int id,String name,boolean state) {
this.id = id;
taskname = name;
status = state;
}
public Task(String name,boolean state){
taskname = name;
status = state;
}
public int getId(){
return id;
}
public void setId(int id){
this.id = id;
}
public String getTaskname(){
return taskname;
}
public void setTaskname(String name){
taskname = name;
}
public boolean getStatus(){
return status;

}
public void setStatus(boolean state){
status = state;
}
}

Maping file Task.hbm.xml:
===================================
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="firsthibernate.persitans.Task" table="TASKS">
<id name="id" column="id">
<generator class="increment"/>
</id>
<property name="taskname"/>
<property name="status"/>
</class>
</hibernate-mapping>

HibernateUtil.java:
====================================
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/

package util;
import net.sf.cglib.proxy.*;
import org.hibernate.*;
import org.hibernate.cfg.*;

public class HibernateUtil {

private static final SessionFactory sessionFactory;

static {
try {
// Create the SessionFactory from hibernate.cfg.xml
sessionFactory = new Configuration().configure().buildSessionFactory();

} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}

public static SessionFactory getSessionFactory() {
return sessionFactory;
}


}

Main.java :
=======================================
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package firsthibernate;

import org.hibernate.Session;
import util.HibernateUtil;
import firsthibernate.persitans.Task;
import java.util.List;

/**
*
* @author Nguyen Tien Dung
*/
public class Main
{

/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
// TODO code application logic here
Session session = HibernateUtil.getSessionFactory().getCurrentSession();

session.beginTransaction();

for (int i = 1; i < 10; i++)
{
Task theTask = new Task("Task_" + i, true);

session.save(theTask);
}
session.getTransaction().commit();

List lst = listEvents();
for(int i=0;i<lst.size();i++)
{
Task tsk = (Task)lst.get(i);
System.out.printf("%s\t%b\n",tsk.getTaskname(),tsk.getStatus());
}

}

private static List listEvents()
{
Session session = HibernateUtil.getSessionFactory().getCurrentSession();

session.beginTransaction();

List result = session.createQuery("from Task").list();

session.getTransaction().commit();

return result;
}
}

Folder :
+ src
hibernate.cfg.xml
+ firsthibernate
Main.java
+ firsthibernate.persitans
Task.java
Task.hbm.xml
+ util
HibernateUtil.java

Hi,
I'm seeing several problems:

This driver is for Microsoft SQL Server or Sybase; you said you are using Oracle so you should use a Oracle driver.


Also the dialect should match your Database type.

regards,