Posting an image through rest service

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Android

i need to select a picture from gallery and post it through a rest service. i am able to select an image and display it in imageView when i click post i get a Verbose error showing FileNotFoundException

try{
                    url = new URL("http://webservices.EducateMax.com/EducateMax.svc/PostInfractionsInfo?sPhoto="+sPicturePath+"&sTitle=sample");
                }catch (MalformedURLException e){
                    Toast.makeText(getApplicationContext(),"Check the URL",Toast.LENGTH_SHORT).show();
                    e.printStackTrace();
                }
                final List<NameValuePair> nameValuePairs = new ArrayList<>();
                nameValuePairs.add(new BasicNameValuePair("sPhoto", sPicturePath));
                nameValuePairs.add(new BasicNameValuePair("sTitle", "sample"));

                Thread thread = new Thread(new Runnable(){
                    @Override
                    public void run() {
                        try {
                            //Your code goes here
                            MultiPartServer1.postData(url, nameValuePairs);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                });
                thread.start();

MultiPartServer.java

private static final String TAG = "MultipartServer";
    private static String crlf = "\r\n";
    private static String twoHyphens = "--";
    private static String boundary =  "*****";
    private static String avatarPath = null;

    public static String postData(URL url, List<NameValuePair> nameValuePairs) throws IOException {

        HttpURLConnection connection = (HttpURLConnection) url.openConnection();
        connection.setReadTimeout(10000);
        connection.setConnectTimeout(15000);
        connection.setRequestMethod("POST");
        connection.setUseCaches(false);
        connection.setDoInput(true);
        connection.setDoOutput(true);

        connection.setRequestProperty("Connection", "Keep-Alive");
        connection.setRequestProperty("Cache-Control", "no-cache");
        connection.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

        String avatarName = null;
        StringBuilder query = new StringBuilder();
        boolean first = true;
        for (NameValuePair pair : nameValuePairs) {
            if (first)
                first = false;
            else
                query.append("&");
            query.append(URLEncoder.encode(pair.getName(), "UTF-8"));
            query.append("=");
            query.append(URLEncoder.encode(pair.getValue(), "UTF-8"));
            if ((avatarName = pair.getName()).equals("avatar")) {
                avatarPath = pair.getValue();
            }

        }

        FileInputStream inputStream;
        OutputStream outputStream = connection.getOutputStream();
        DataOutputStream dataOutputStream = new DataOutputStream(outputStream);

        dataOutputStream.writeBytes(query.toString());

        // Write Avatar (if any)
        if(avatarName != null && avatarPath != null) {
            dataOutputStream.writeBytes(twoHyphens + boundary + crlf);
            dataOutputStream.writeBytes("Content-Disposition: form-data; name=\"" + avatarName + "\";filename=\"" + new File(avatarPath).getName() + "\";" + crlf);
            dataOutputStream.writeBytes(crlf);

        /*Bitmap avatar = BitmapFactory.decodeFile(avatarPath);
        avatar.compress(CompressFormat.JPEG, 75, outputStream);
        outputStream.flush();*/

            inputStream = new FileInputStream(avatarPath);
            byte[] data = new byte[1024];
            int read;
            while((read = inputStream.read(data)) != -1)
                dataOutputStream.write(data, 0, read);
            inputStream.close();

            dataOutputStream.writeBytes(crlf);
            dataOutputStream.writeBytes(twoHyphens + boundary + twoHyphens + crlf);
        }

        dataOutputStream.flush();
        dataOutputStream.close();

        String responseMessage = connection.getResponseMessage();
        Log.d(TAG, responseMessage);

        InputStream in = connection.getInputStream();
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in, "UTF-8"));

        StringBuilder response = new StringBuilder();
        char []b = new char[512];
        int read;
        while((read = bufferedReader.read(b))!=-1) {
            response.append(b, 0, read);
        }

        connection.disconnect();
        Log.d(TAG, response.toString());
        return response.toString();
    }

What I have tried:

selecting an image from gallery, display it in an ImageView. MultipartServer class is intended to HTTP operations