how to get motherboard serial number on GUI (in java)

I did like to show a motherboard serial number in text field (GUI panel). I created a text field and action button. I wrote this code in action button. What mistake did i make in this code?

try {
        Process p = Runtime.getRuntime().exec("wmic baseboard get serialnumber");
        BufferedReader inn = new BufferedReader(new InputStreamReader(p.getInputStream()));

        while (true) {

            String line = inn.readLine();
            if (line == null) {
                break;
            }
            motherboard.setText(line);
        }
    } catch (Exception e) {
        JOptionPane.showMessageDialog(this, "Sorry could not found motherboard serial!");
    }

 try
    {
        String result = null;
        Process p = Runtime.getRuntime().exec("wmic baseboard get serialnumber");
        BufferedReader input
                = new BufferedReader(new InputStreamReader(p.getInputStream()));
        String line;
        while ((line = input.readLine()) != null)
        {
            result += line;
        }
        if (result.equalsIgnoreCase(" ")) {
            System.out.println("Result is empty");
        } else
        {
            motherboard.setText(result);
        }
        input.close();
    } catch (IOException ex)
    {
        Exceptions.printStackTrace(ex);
    }