public void loadFile(String excelPath) {
        try {
            File excelFile = new File(excelPath);
            InputStream myxls = new FileInputStream(excelFile);
            wb = new HSSFWorkbook(myxls);
        } catch (Exception e) {
            throw new IllegalStateException("Cannot load excel file - "
                    + excelPath, e);
        }
    }