Apache POI Border style not working

Question

I am trying to make a thick border for a cell

CellStyle topBorderStyle = workbook.createCellStyle();
topBorderStyle.setBorderTop(BorderStyle.THICK);
Row row1 = worksheet.createRow(0);
Cell cell1 = row1.createCell(0);
cell.setCellStyle(topBorderStyle);

As a result a cell does not have a thick border

Answer 1

You are setting the style on cell instead of cell1 . Also I think you should be using HSSFCellStyle.BORDER_THICK

Try this:

CellStyle cellStyle = workbook.createCellStyle();
cellStyle.setBorderTop(HSSFCellStyle.BORDER_THICK);
Row row1 = worksheet.createRow(0);
Cell cell1 = row1.createCell(0);
cell1.setCellStyle(cellStyle);

I just tried it out and it works.