Generic DAO Using Hibernate

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package ac.dia.dao;

import ac.dia.util.HibernateUtil;
import java.io.Serializable;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.Transaction;

/**
 *
 * @author user1
 * @param <T>
 * @param <ID>
 */
public abstract class GenaricDAO<T, ID extends Serializable> {

    Session session = HibernateUtil.getSessionFactory().openSession();
    T obj;

    public void saveData(T obj) throws Exception {
        Transaction t = session.beginTransaction();
        session.save(obj);
        t.commit();
    }

    public void updateData(T obj) throws Exception {
        Transaction t = session.beginTransaction();
        session.update(obj);
        t.commit();
    }

    public void deleteData(T obj) throws Exception {
        Transaction t = session.beginTransaction();
        session.delete(obj);
        t.commit();
    }

    public T findData(Class c, ID id) throws Exception {
        return (T) session.get(c, id);
    }

    public List<T> getAllData(Class c) throws Exception {
        return (List<T>) session.createCriteria(c).list();
    }

}