Steps to Reproduce

1. import keikai-662.xlsx
2. export it in xlsx format
3. open the file with Excel

Current Result

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<recoveryLog xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"><logFileName>Repair Result to keikai-662-export0.xml</logFileName><summary>Errors were detected in file '/Users/hawk/Downloads/keikai-662-export.xlsx'</summary><repairedRecords summary="Following is a list of repairs:"><repairedRecord>Repaired Records: Table from /xl/tables/table1.xml part (Table)</repairedRecord></repairedRecords></recoveryLog>

Expected Result

no alert

Debug Information

• keikai trims String tbColName = tbCol.getName().trim(); a table header for KEIKAI-550, but Excel checks consistency between a table header and its display value in sharedStrings.xml. Since these 2 values don't match each other, Excel shows an alert.
  If you check the exported file > sharedStrings.xml, it contains a tailing space:

  <si><t xml:space="preserve">Has Space at the End </t></si>
  

  But the text in table header doesn't have the tailing space, this mismatch causes an Excel alert.

• verification

  protected void exportCell(Row poiRow, SCell cell) {
  ...
  		case STRING:
  			poiCell.setCellType(Cell.CELL_TYPE_STRING);
  			if(cell.isRichTextValue()) {
                                  ...
  			} else {
  				poiCell.setCellValue(cell.getStringValue().trim());
  			}
  			break;
  ..
  

  If I trim the cell string value, too, Excel can open the exported file without the alert.

Workaround

• remove the tailing space character in the table header