facing diffculty to highlight background color of an excel cell which is not reflected in file

[anish reddy]

iam unable to fill background color for an excel cell

HSSFWorkbook hwb = new HSSFWorkbook();
HSSFSheet sheet = hwb.createSheet("new sheet");
HSSFCellStyle style = hwb.createCellStyle();


HSSFRow row = sheet.createRow((short) 0);

HSSFCell cell = row.createCell((short) 0);
cell.setCellValue(1);

style.setFillBackgroundColor(HSSFColor.RED.index);
style.setFillPattern(HSSFCellStyle.BIG_SPOTS);


cell.setCellStyle(style);


FileOutputStream fileOut = new FileOutputStream("C:\\fillsColor.xls");
hwb.write(fileOut);
fileOut.close();

here is my code please can any one give inputs which correctly reflects background color for a cell of an excel or code do it