public class IncrementTester {
  private Long id;
  private String name;
  public IncrementTester(){}
  public IncrementTester(String name){
    this.name = name;
  }
  public Long getId(){
    return this.id;
  }
  private void setId(Long id){
    this.id = id;
  }
  public String getName(){
    return this.name;
  }
  public void setName(String name){
    this.name = name;
  }
}

import java.lang.reflect.*;
import org.hibernate.*;
import org.hibernate.cfg.*;
import java.io.*;
import java.sql.*;
import java.util.*;
public class BussinessService {
  public static SessionFactory sessionFactory;
  static{
    try{
      Configuration config = new Configuration().configure();
      sessionFactory = config.buildSessionFactory();
    }catch(Exception e){
      e.printStackTrace();
    }
  }
  public void findAllObjects(String className){
    Session session = sessionFactory.openSession();
    Transaction tx = null;
    try{
      tx = session.beginTransaction();
      List objects = session.createQuery("from "+className).list();
      for(Iterator it = objects.iterator();it.hasNext();){
        Long id = new Long(0);
        IncrementTester xx = (IncrementTester)it.next();
        id=xx.getId();
        System.out.println("ID of "+className+":"+id+" name: "+xx.getName());
      }
      tx.commit();
    }catch(Exception e){
      e.printStackTrace();
    }finally{
      session.close();
    }
  }
  public void saveObject(Object object){
    Session session = sessionFactory.openSession();
    Transaction tx = null;
    try{
      tx = session.beginTransaction();
      session.save(object);
      tx.commit();
    }catch(Exception e){
      e.printStackTrace();
      if(tx != null){
        tx.rollback();
      }
    }finally{
      session.close();
    }
  }
  public void deleteAllObject(String className){
    Session session = sessionFactory.openSession();
    Transaction tx = null;
    try{
      tx = session.beginTransaction();
      Query query=session.createQuery("delete from "+className);
      query.executeUpdate();
      tx.commit();
    }catch(Exception e){
      e.printStackTrace();
      if(tx!=null){
        tx.rollback();
      }
    }finally{
      session.close();
    }
  }
}

public class test {
  /**
   * @param args
   */
  public static void main(String[] args) {
    // TODO Auto-generated method stub
    String name="IncrementTester";
    BussinessService aa = new BussinessService();
    aa.deleteAllObject(name);
    Object o1 = null;
    try {
      o1 = Class.forName(name).newInstance();
      ((IncrementTester)o1).setName("caijie");
      aa.saveObject(o1);
      o1 = Class.forName(name).newInstance();
      ((IncrementTester)o1).setName("gufeng");
      aa.saveObject(o1);
    } catch (Exception e) {
      e.printStackTrace();
    }
    aa.findAllObjects(name);
  }
}

Hibernate: delete from INCREMENT_TESTR
Hibernate: select max(ID) from INCREMENT_TESTR
Hibernate: insert into INCREMENT_TESTR (NAME, ID) values (?, ?)
Hibernate: insert into INCREMENT_TESTR (NAME, ID) values (?, ?)
Hibernate: select incrementt0_.ID as ID0_, incrementt0_.NAME as NAME0_ from INCREMENT_TESTR incrementt0_
ID of IncrementTester:1 name: caijie
ID of IncrementTester:2 name: gufeng