Cannot get a numeric value from a text cell while getting data from xlsx file

Question

Getting below error while reading data from a .xlsx file. I am not able to read data due to this error. Facing the error message "cannot get a numeric value from a text cell".

Here is the code:

switch (cell.getCellType()) {
    case HSSFCell.CELL_TYPE_FORMULA:
        rowArray[count] = isCellDateFormatted(cell) ? dateFormat.format(cell.getDateCellValue()) : Double.toString(cell.getNumericCellValue());
        break;
    case Cell.CELL_TYPE_BOOLEAN:
        rowArray[count] = Boolean.toString(cell.getBooleanCellValue());
        break;
    case Cell.CELL_TYPE_NUMERIC:
        rowArray[count] = isCellDateFormatted(cell) ? dateFormat.format(cell.getDateCellValue()) : Double.toString(cell.getNumericCellValue());
        break;
    case Cell.CELL_TYPE_STRING:
        rowArray[count] = cell.getStringCellValue().replace(separatorStr, escapeStr + separatorStr).replace("\n", " ");
        break;
    default:
        rowArray[count] = "";
}

Here is the exception:

java.lang.IllegalStateException: Cannot get a numeric value from a text cell
 at org.apache.poi.xssf.usermodel.XSSFCell.typeMismatch(XSSFCell.java:994)
 at org.apache.poi.xssf.usermodel.XSSFCell.getNumericCellValue(XSSFCell.java:305)
 at org.apache.poi.ss.usermodel.DateUtil.isCellDateFormatted(DateUtil.java:494)
 at cvx.qwer.adfffg.excel.XlsxToCsv.convertToCsv(XlsxToCsv.java:76)
 at cvx.qwer.adfffg.excel.XlsxToCsv.main(XlsxToCsv.java:136)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Answer 1

As of your showed code the rowArray seems to be a String array. So the need is to get all cell values as String representations. Best way to do so is using DataFormatter in combination with FormulaEvaluator :

...
Workbook workbook ...
...
FormulaEvaluator evaluator = workbook.getCreationHelper().createFormulaEvaluator();
DataFormatter formatter = new DataFormatter();
...
Cell cell ...
...
rowArray[count] = formatter.formatCellValue(cell, evaluator);
...

Using this the whole switching the cell types is not necessary. DataFormatter.formatCellValue :

Returns the formatted value of a cell as a String regardless of the cell type.