(Android json) java.lang.String cannot be cast to org.json.simple.JSONObject

I parser String to JSON using simplejson.

Here my json string.

"{\"Result\":[{\"trxCode\":\"Y\",\"trxMsg\":\"Success\"}],\"Table1\":[{\"TNS_NM\":\"TEST\",\"USR_ID\":\"TESTER\",\"USR_PWD\":\"TEST\",\"DB_IP\":\"TEST_IP\"}]}"

I need to parse this.

So here my code

private static Map<String, Object> convertInputStreamToString(InputStream inputStream) throws IOException
{
    Map<String, Object> result = new HashMap<>();
    try
    {
        BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(inputStream));
        String line = "";
        StringBuilder sb = new StringBuilder();

        while((line = bufferedReader.readLine()) != null)
            sb.append(line);
        String json = sb.toString();
        JSONParser parser = new JSONParser();
        JSONObject jsonObject = (JSONObject) parser.parse(json); // error occur here

        result.put("trxMsg", jsonObject);
    }
    catch (Exception e)
    {
        result.put("error", e.getMessage());
        //  java.lang.String cannot be cast to org.json.simple.JSONObject
    }
    finally
    {
        inputStream.close();
    }
    return result;
}

But If I put the string value directly, no error occurs.

JSONObject jsonObject = (JSONObject) parser.parse("{\"Result\":[{\"trxCode\":\"Y\",\"trxMsg\":\"Success\"}],\"Table1\":[{\"TNS_NM\":\"TEST\",\"USR_ID\":\"TESTER\",\"USR_PWD\":\"TEST\",\"DB_IP\":\"TEST_IP\"}]}");

Even, It work.

String json = "{\"Result\":[{\"trxCode\":\"Y\",\"trxMsg\":\"Success\"}],\"Table1\":[{\"TNS_NM\":\"TEST\",\"USR_ID\":\"TESTER\",\"USR_PWD\":\"TEST\",\"DB_IP\":\"TEST_IP\"}]}";
JSONParser parser = new JSONParser();
JSONObject jsonObject = (JSONObject) parser.parse(json);

But these not work..

String json = sb.toString();
JSONParser parser = new JSONParser();
JSONObject jsonObject = (JSONObject) parser.parse(json);
// or...
JSONParser parser = new JSONParser();
JSONObject jsonObject = (JSONObject) parser.parse(sb.toString());

I know my question is same this.

But that answer can't apply to my code.

Answer is parse in Main.

public static void main(String[] args) { }

But my case, connect is done by the user's button click.

So I cannot be used, and I need for android

I couldn't find a answer anywhere else.

please help me.