学习一个例子的时候遇到一个问题，不知道如何解决，请高手帮忙

[vagrant_zy]

是一个使用stuts,hibernate的BS结构的列子

com.audit.dao.DAOFactory

package com.audit.dao;

import com.audit.dao.imp.*;

public abstract class DAOFactory {
	
	private static Object initLock = new Object();

	private static String className = "com.audit.dao.imp.HibernateDAOFactory";

	private static DAOFactory factory = null;

	public static DAOFactory getInstance() {
		if (factory == null) {
			synchronized (initLock) {
				if (factory == null) {
					// Note, the software license expressely forbids
					// tampering with this check.
					// LicenseManager.validateLicense("Jive Forums Basic",
					// "2.0");

					String classNameProp = DAOConfig
							.getProperty("DAOFactory.className");
					if (classNameProp != null) {
						className = classNameProp;
					}
					try {
						// Load the class and create an instance.
						Class c = Class.forName(className);
						factory = (DAOFactory) c.newInstance();
					} catch (Exception e) {
						System.err.println("Failed to load DAOFactory class "
								+ className
								+ ". Audit cannot function normally.");
						System.out.print(e);
						e.printStackTrace();
						return null;
					}
				}
			}
		}
		return factory;
	}

	public abstract UserInfoDAO 	createUserInfoDAO();
	public abstract RoleDAO 		createRoleDAO();
	public abstract ProvinceDAO 	createProvinceDAO();
	public abstract CorpDAO 		createCorpDAO();
}

com.audit.dao.imp.HibernateDAOFactory

package com.audit.dao.imp;

import com.audit.dao.UserInfoDAO;
import com.audit.dao.RoleDAO;
import com.audit.dao.ProvinceDAO;
import com.audit.dao.CorpDAO;

public class HibernateDAOFactory extends DAOFactory {

	public UserInfoDAO createUserInfoDAO() {
		// TODO Auto-generated method stub
		return new UserInfoDAOImp();
	}

	public RoleDAO createRoleDAO() {
		// TODO Auto-generated method stub
		return new RoleDAOImp();
	}

	public ProvinceDAO createProvinceDAO() {
		// TODO Auto-generated method stub
		return new ProvinceDAOImp();
	}

	public CorpDAO createCorpDAO() {
		// TODO Auto-generated method stub
		return new CorpDAOImp();
	}
}

com.audit.dao.imp.DAOFactory

package com.audit.dao.imp;

import com.audit.dao.UserInfoDAO;
import com.audit.dao.RoleDAO;
import com.audit.dao.ProvinceDAO;
import com.audit.dao.CorpDAO;


public class DAOFactory {
	
}

调用到com.audit.dao.DAOFactory的factory = (DAOFactory) c.newInstance();的时候会发生类型转换错误：java.lang.ClassCastException: com.audit.dao.imp.HibernateDAOFactoryjava.lang.ClassCastException: com.audit.dao.imp.HibernateDAOFactory

因为初学，我也不太理解为什么例子中有2个DAOFactory，请高手赐教

[koj5201314]

hibernate 没必要这么写吧
自己自动生产的~~~