Getting Null pointer Exception while writing into Excel file - nullpointerexception

Question

Getting a Null Pointer Exception while writing into Excel file:
public static void setCellData(String Result, int RowNum, int ColNum) throws Exception {
try{
Rw = ExcelWSheet.createRow(RowNum);
Cell = Rw.getCell(ColNum, null);
if (Cell == null) {
Cell = Rw.createCell(ColNum);
Cell.setCellValue(Result);
} else {
Cell.setCellValue(Result);
}
FileOutputStream fileOut = new FileOutputStream(Path_TestData + File_TestData);
ExcelWBook.write(fileOut);
fileOut.flush();
fileOut.close();
}catch(Exception e){
throw (e);
}
And passing parameters from another class
File.setCellData("Pass", 2, 2);
This is throwing an exception error as Null Pointer Exception.
I have already used createRow() method instead of the getRow() to avoid null value & my excel has data but still getting an error.
Can anyone please help to resolve this error?

Answer 1

Please see the code below and try it.
I hope it will help you.
public static void setCellData(String Result, int RowNum, int ColNum) throws Exception {
try{
//Blank workbook
XSSFWorkbook workbook = new XSSFWorkbook();
//Create a blank sheet
XSSFSheet sheet = workbook.createSheet("Employee Data");
XSSFSheet ExcelWSheet = sheet;
XSSFCell Cell;
XSSFRow Row;
Row = ExcelWSheet.createRow(RowNum);
Cell = Row.getCell(ColNum, org.apache.poi.ss.usermodel.Row.RETURN_BLANK_AS_NULL);
if (Cell == null) {
Cell = Row.createCell(ColNum);
Cell.setCellValue(Result);
} else {
Cell.setCellValue(Result);
}
FileOutputStream out = new FileOutputStream(new File("Done.xlsx"));
workbook.write(out);
out.close();
System.out.println("sreeraj done the code");
}catch(Exception e){
throw (e);
}