getCurrentSession nao consigo encontrar/usar

package br.com.policiaMilitar.web.filter;

import java.util.Collection;	


import br.com.policiaMilitar.util.HibernateUtil;
import javax.servlet.*;
import javax.servlet.Filter;
import org.hibernate.SessionFactory;
import org.hibernate.Session;
import org.hibernate.*;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;	



public class HibernateSessionRequestFilter implements Filter {

	private SessionFactory sf;

	public void init(FilterConfig config) throws ServletException {
		sf = HibernateUtil.getSf();
	}

	public void doFilter(ServletRequest sRq, ServletResponse sRp, FilterChain chain)throws ServletException{
			
			try{
				
				sf.getCurrentSession.getCurrentSession().beginTransaction();
				chain.doFilter(sRq, sRp);
				sf.getCurrentSession().getTransaction().commit();
				sf.getCurrentSession().close();
				
			}catch(Throwable e){
				try{					
					if(sf.getCurrentSession().getTransaction().isActive()){
						sf.getCurrentSession().getTransaction().rollback();
					}				
				}catch(Throwable ex){
					ex.printStackTrace();					
				}
				throw new ServletException(e);
			}
			}
	
	public void destry(){
		
	}

	public String getName() {
		// TODO Auto-generated method stub
		return null;
	}

	public Filter setParameter(String arg0, Object arg1) {
		// TODO Auto-generated method stub
		return null;
	}

	public Filter setParameterList(String arg0, Collection arg1) {
		// TODO Auto-generated method stub
		return null;
	}

	public Filter setParameterList(String arg0, Object[] arg1) {
		// TODO Auto-generated method stub
		return null;
	}

	public void validate() throws HibernateException {
		// TODO Auto-generated method stub
		
	}

	public void destroy() {
		// TODO Auto-generated method stub
		
	}
}