Apache POI 3.14

[Sutharshan]

In my application we have a functionality of exporting data into EXCEL(XLSX) format in which we used Apache POI 3.14 while creating a sheet with its name
It doesn't throw any exception or error but post that code the program doesn't run

final SXSSFSheet s = wb.createSheet(sheetTitle);

CBXCanvasXLSGenerator.logger.ctdebug("CTEXP00047", "--After creating sheet");
Row r = null;
Cell c = null;
s.setDisplayGridlines(false);
s.setPrintGridlines(false);