netshowers

Use the group header instead of column headers, more info see https://community.jaspersoft.com/questions/513020/how-hide-columnheader-band-when-no-detail

Actually, you can try to add a group header band instead of the column header, put column header fields to group header, after adding it, you need to remove group header expression to empty, that means don't need to set group expression, and checked 'Reprint Header On Each Page' properties, I just fixed an issue by this way on Jaspersoft Studio 6.4.0, I hope it's helpful

Please fix it asap in next version, thanks