Using Apache POI HSSF, how can I refresh all formula cells at once?

Question

I am filling cells of an Excel file using Apache POI, and there are a lot of formula cells in the document. However, their values are not refreshed when I open the document

Answer 1

Sure. Refreshing all the formulas in a workbook is possibly the more typical use case anyway.

If you're using HSSF, call evaluatorAllFormulaCells:

 HSSFFormulaEvaluator.evaluateAllFormulaCells(hssfWorkbook)

If you're using XSSF, call evaluatorAllFormulaCells:

 XSSFFormulaEvaluator.evaluateAllFormulaCells(xssfWorkbook)

More details are available on the poi website

Answer 2

wb.setForceFormulaRecalculation(true);
// replace "wb" with your HSSFWorkbook/XSSFWorkbook object

https://poi.apache.org/apidocs/org/apache/poi/hssf/usermodel/HSSFWorkbook.html#setForceFormulaRecalculation-boolean-

https://poi.apache.org/apidocs/org/apache/poi/xssf/usermodel/XSSFWorkbook.html#setForceFormulaRecalculation-boolean-