while parsing data in json getting error java.lang.nullpointerexception & end of input character at 0

Question

this is my service code. please help me to get rid from` this. i call this service on button click . but getting this error every time.thanks in advance. also check the link to webservices don't know is it correct or not

package com.ballerxtreme;

import java.util.ArrayList;
import java.util.List;

import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.os.AsyncTask;
import android.util.Log;

public class Send_request_id extends AsyncTask<String, String, JSONObject> {
    Activity activity;
    String request_id;
    JSONParser jp = new JSONParser();

    public Send_request_id(Activity activity, String request_id) {
        this.activity = activity;
        this.request_id = request_id;
    }

    @Override
    protected void onPreExecute() {     
        super.onPreExecute();
    }

    @Override
    protected JSONObject doInBackground(String... params) {

        String url = "http://jstarfitness.com/service/saveuser.php";
        // String url = "http://jstarfitness.com/service/index.php";
        JSONParser parser = new JSONParser();

        List<NameValuePair> param = new ArrayList<NameValuePair>();
        param.add(new BasicNameValuePair("requestid", request_id));
        String json_send = parser.makeHttpRequest(url, "post", param);
        JSONObject jobj = null;
        try {
            Log.e("Request-Id-Send", json_send);

            jobj = new JSONObject(json_send);

        } catch (JSONException e) {

            Log.e("Request-Id-Send", json_send);
            e.printStackTrace();
            String io = e.getMessage();

            Log.e("error", io);

        }
        return jobj;
    }

    @Override
    protected void onPostExecute(JSONObject result) {
        // TODO Auto-generated method stub
        Log.e("Id_Send", request_id);
        super.onPostExecute(result);
    }

}

Answer 1

I got solution from the above comments by make changes in the jsonparser class. changes in the post method now data is sent to link successfull... thanks