try {
      Properties props = new Properties();
      props.put("user",     user);
      props.put("password", password);
      DriverManager.registerDriver(new oracle.jdbc.driver.OracleDriver());
      // Open standard connection
      OracleConnection con = (OracleConnection)
        DriverManager.getConnection("jdbc:oracle:oci8:@"+url,props); // also works with thin
      ResultSet rst = con.createStatement().executeQuery ("select user from dual");
      while (rst.next()) {
        System.out.println ("Standard connection: user=" + rst.getString(1));
      }
      rst.close();
      // Open proxy connection
      props.put(OracleConnection.PROXY_USER_NAME,     proxyUs);
      props.put(OracleConnection.PROXY_USER_PASSWORD, proxyPsw);
      con.openProxySession (OracleConnection.PROXYTYPE_USER_NAME, props);
      rst = con.createStatement().executeQuery ("select user from dual");
      while (rst.next()) {
        System.out.println ("Proxy connection: user=" + rst.getString(1));
      }
      con.close();
    }