threadlocal

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<Connection> tl = new ThreadLocal<Connection>();
    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();
    }
    
}