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java sdk websocket - com.neovisionaries.ws.client.WebSocketException: The status line of the opening handshake response is empty

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    Generated the jwttoken by using api client id to get the generate session.

     String clientId = "xxx";
        SmartConnect smartConnect = new SmartConnect();
        String apiKey = "xxx";
        // Provide your API key here
        smartConnect.setApiKey(apiKey);
        User user = smartConnect.generateSession(clientId, "xxx", tOtp);
        System.out.println("jwt token : "+  user.getAccessToken());
        String jwtToken = user.getAccessToken();

    Then

    SmartWebsocket smartWebsocket = new SmartWebsocket(clientId, jwtToken, apiKey, actionType, feedType);

        smartWebsocket.setOnConnectedListener(new SmartWSOnConnect() {

            @Override
            public void onConnected() {
                System.out.println("smart web socket connected..");
                smartWebsocket.runscript();
            }
        });

        smartWebsocket.setOnDisconnectedListener(new SmartWSOnDisconnect() {
            @Override
            public void onDisconnected() {
                System.out.println("onDisconnected");
            }
        });

        /** Set error listener to listen to errors. */
        smartWebsocket.setOnErrorListener(new SmartWSOnError() {
            @Override
            public void onError(Exception exception) {
                System.out.println("onError: " + exception.getMessage());
            }

            @Override
            public void onError(SmartAPIException smartAPIException) {
                System.out.println("onError: " + smartAPIException.getMessage());
            }

            @Override
            public void onError(String error) {
                System.out.println("onError: " + error);
            }
        });

        smartWebsocket.setOnTickerArrivalListener(new SmartWSOnTicks() {
            @Override
            public void onTicks(JSONArray ticks) {
                System.out.println("ticker data: " + ticks.toString());
            }
        });

        /**
         * connects to SmartAPI ticker server for getting live quotes
         */
        smartWebsocket.connect();

    While connecting getting the below exception - opening handshake is empty.

    com.neovisionaries.ws.client.WebSocketException: The status line of the opening handshake response is empty.
    at com.neovisionaries.ws.client.HandshakeReader.readStatusLine(HandshakeReader.java:99)

    0