I want to color an Excel cell with blue color :
HSSFCellStyle headerCellStyle = worksheet.getWorkbook().createCellStyle();
headerCellStyle.setFillBackgroundColor(HSSFColor.BLUE.index);
headerCellStyle.setFillPattern(CellStyle.FINE_DOTS);
cell = rowHeader.createCell(startColIndex++);
cell.setCellValue("Titre");
cell.setCellStyle(headerCellStyle);
The cell should be blue instead of grey. I don't understant what I am doing wrong.