Create EventDAO.java

package events;

import java.util.Date;
import java.util.List;

import org.hibernate.Session;
import org.zkoss.zkplus.hibernate.HibernateUtil;

public class EventDAO {

    Session currentSession() {
        return HibernateUtil.currentSession();
    }
    
    public void saveOrUpdate(Event anEvent, String title, Date date) {
        Session sess =  currentSession();
        anEvent.setTitle(title);
        anEvent.setDate(date);    
    
        
        sess.saveOrUpdate(anEvent);
    }

    public void delete(Event anEvent) {
        Session sess =  currentSession();
      
        sess.delete(anEvent);
    }
    
    public Event findById(Long id) {
        Session sess =  currentSession();
      
        return (Event) sess.load(Event.class, id);
    }
    
    public List findAll() {
        Session sess =  currentSession();  
  	
      
        return sess.createQuery("from Event").list();
    }
}

你需要编译Java源文件，然后将类文件放到Web部署文件夹的classes目录下，要保证包名正确。(例如，$myApp/WEB-INF/classes/event/EventDAO.class)