I am new to jxl, but I have what I think is a pretty simple requirement. I want to take an existing .xls file with three tabs, turn off the gridlines on all 3, and then save it again. It looks from the API like there is a function to handle gridlines setPrintGridLines(boolean b)

I would love it if someone could give me sample code - or a link pointing me in the right direction - on how to do this.

Thank you in advance

Here is what I've tried (bear with me, like I said I'm brand new to jxl)

WorkbookSettings ws = new WorkbookSettings();
WritableWorkbook workbook = Workbook.createWorkbook(new File(xlsFile), ws);
WritableSheet[] w = workbook.getSheets();

for ( WritableSheet sheet : w ) {
    sheet.getSettings().setPrintGridLines(false);
}

workbook.write();
workbook.close();

I get the error Could not generate XLS. Index: 0, Size: 0 but I may be totally off base in what I am trying