Java BufferedReader value become null

Question

I\'m using following code to get response from the API.

BufferedReader bf = new BufferedReader(new InputStreamReader(
                connection.getInputStream(         


        

Answer 1

Your code should be

BufferedReader bf = new BufferedReader(new InputStreamReader(
                connection.getInputStream()));

String output = null;

        while ((output = bf.readLine()) != null) {
         System.out.println("bf.readLine() value is--- - " + output );

            JSONObject obj = new JSONObject(output);
            System.out.println("output is " + output);
            resCode = obj.getString("resCode");
            resDesc = obj.getString("COUNT");
        }

Answer 2

The reason is you are calling readLine twice. You calling first at System.out.println("bf.readLine() - " + bf.readLine()); and again at output = bf.readLine();

Modify as output = bf.readLine();System.out.println("bf.readLine() - " + output);

As per oracle docsreadLine()

Returns: A String containing the contents of the line, not including any line-termination characters, or null if the end of the stream has been reached

if the end of the stream is reached then you will get null and operations on null will give nullpointerexception