AYUDA PORFAVOR

Question

 hola comunidad les cuento soy nuevo llego recién una semana trabajando como programador lo que pasa es que tengo que hacer un metodo que me lee excel y luego me los pase a base de datos y que pueda ser cargado mediante un fileUpload (igual que subir una foto a facebook)  lo que pasa es que el archivo me llega  null  si me pudieran ayudar o orientar se los agradeseria mucho  les adjunto mi codigo



/**
     * Import excel file into contacts
     *     
* @param fileUpload : XLS or XLSX file
     */
    public void handleFileUpload(FileUploadEvent fileUpload) throws IOException, InvalidFormatException {
        RequestContext context = RequestContext.getCurrentInstance();
        List<Excel> excels = new ArrayList<Excel>();
        try {
            String fileName = fileUpload
                    .getFile()
                    .getFileName()
                    .substring(
                    fileUpload.getFile().getFileName()
                    .indexOf("."));
            // Store file in user home
            copyFile(fileName, fileUpload.getFile().getInputstream());
            // Get stored file
            File file = new File(System.getProperty("user.home") + "/"
                    + fileName);
            // Get the workbook instance for XLS file
            Workbook workbook = WorkbookFactory
                    .create(new FileInputStream(file));
            // Get first sheet from the workbook
            Sheet sheet = workbook.getSheetAt(0);
            // Iterate through each rows from first sheet
            Iterator<Row> rowIterator = sheet.iterator();
            while (rowIterator.hasNext()) {
                Row row = rowIterator.next();
                Excel exc = new Excel();
                System.out.println("A1 :" + nombre);
                System.out.println("b1 :" + dia);
                System.out.println("c1 :" + hora);
                excels.add(exc);
            }
        } catch (IOException e) {
            System.out.println(e);
        }
    }

    /**
     * Save uploaded File into user home dir
     *
     * @param fileName
     * @param in
     */
    private void copyFile(String fileName, InputStream in) {
        try {
            OutputStream out = new FileOutputStream(new File(
                    System.getProperty("user.home") + "/" + fileName));

            int read = 0;
            byte[] bytes = new byte[1024];

            while ((read = in.read(bytes)) != -1) {
                out.write(bytes, 0, read);
            }

            in.close();
            out.flush();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }