private static final ThreadLocal threadSession = new ThreadLocal();    public static Session getSession() throws InfrastructureException {        Session s = (Session) threadSession.get();        try {            if (s == null) {                s = getSessionFactory().openSession();                threadSession.set(s);            }        } catch (HibernateException ex) {            throw new InfrastructureException(ex);        }        return s;    }

public class ConnectionUtil {    private static ThreadLocal
    
      tl = new ThreadLocal
     
      ();    private static Connection initConn = null;    static {        try {            initConn = DriverManager.getConnection("url, name and password");        } catch (SQLException e) {            e.printStackTrace();        }    }        public Connection getConn() {        Connection c = tl.get();        if(null == c) tl.set(initConn);        return tl.get();    }    }