When getting cell content using Apache-POI Library, I get both "Cannot get a numeric value from a text cell" and the reverse of that. How do I fix it?

Question

I realize the question is a little confusing, but I didn't know how else to word it. Anyway, here is the original code:

private void readFile(String excelFileName) throws FileNotFoundException, IOException {
    XSSFWorkbook workbook = new XSSFWorkbook(new FileInputStream(excelFileName));
    if (workbook.getNumberOfSheets() > 1){
        System.out.println("Please make sure there is only one sheet in the excel workbook.");
    }
    XSSFSheet sheet = workbook.getSheetAt(0);
    int numOfPhysRows = sheet.getPhysicalNumberOfRows();
    XSSFRow row;
    XSSFCell num;
    for(int y = 1;y < numOfPhysRows;y++){    //start at the 2nd row since 1st should be category names
        row = sheet.getRow(y);
        poNum = row.getCell(1);
        item = new Item(Integer.parseInt(poNum.getStringCellValue());
        itemList.add(item);
        y++;
    }
}

private int poiConvertFromStringtoInt(XSSFCell cell){
    int x = Integer.parseInt(Double.toString(cell.getNumericCellValue()));
    return x;
}

I am getting the following error:

Exception in thread "main" java.lang.IllegalStateException: Cannot get a numeric value from a text cell
    at org.apache.poi.xssf.usermodel.XSSFCell.typeMismatch(XSSFCell.java:781)
    at org.apache.poi.xssf.usermodel.XSSFCell.getNumericCellValue(XSSFCell.java:199)

Even if I change it to get either a string using XSSFCell.getStringCellValue() or even XFFSCell.getRichTextValue, I get the reverse of the above error message (and I am making sure to ultimately make it an int using Integer.parseInt(XSSFCell.getStringCellValue()).

The error then reads:

Exception in thread "main" java.lang.IllegalStateException: Cannot get a text value from a numeric cell
    at org.apache.poi.xssf.usermodel.XSSFCell.typeMismatch(XSSFCell.java:781)
    at org.apache.poi.xssf.usermodel.XSSFCell.getNumericCellValue(XSSFCell.java:199)

I know for a fact that the excel spreadsheet column is in fact a string. I can't change the excel sheet as it is uploaded else where always using the same format and formatting each column first takes up to much processing time.

Any suggestions?

[Solution] Here is the solution code I came up with from @Wivani's help:

private long poiGetCellValue(XSSFCell cell){
    long x;
    if(cell.getCellType() == 0)
        x = (long)cell.getNumericCellValue();
    else if(cell.getCellType() == 1)
        x = Long.parseLong(cell.getStringCellValue());
    else
        x = -1;
    return x;
}

Answer 1

Use This as reference

switch (cell.getCellType()) {
                case Cell.CELL_TYPE_STRING:
                    System.out.println(cell.getRichStringCellValue().getString());
                    break;
                case Cell.CELL_TYPE_NUMERIC:
                    if (DateUtil.isCellDateFormatted(cell)) {
                        System.out.println(cell.getDateCellValue());
                    } else {
                        System.out.println(cell.getNumericCellValue());
                    }
                    break;
                case Cell.CELL_TYPE_BOOLEAN:
                    System.out.println(cell.getBooleanCellValue());
                    break;
                case Cell.CELL_TYPE_FORMULA:
                    System.out.println(cell.getCellFormula());
                    break;
                default:
                    System.out.println();
            }