public class XSSFSheet {
...
    private void rebuildRows() {
        final boolean bRebuildCTSheetData=true;
        //rebuild the _rows map
        List<XSSFRow> rowList = new ArrayList<>(_rows.values());
        _rows.clear();
        for(XSSFRow r : rowList) {
            // Performance optimization: explicit boxing is slightly faster than auto-unboxing, though may use more memory
            final Integer rownumI = new Integer(r.getRowNum()); // NOSONAR
            _rows.put(rownumI, r);
        }
        
        if(bRebuildCTSheetData) {
            //  Rebuild the CTSheetData.getRowList()
            final Map<Long,CTRow>ctRowMap=new TreeMap<>();
            for(CTRow ctRow:getCTWorksheet().getSheetData().getRowList()) {
                final Long rowNum=new Long(ctRow.getR());
                ctRowMap.put(rowNum,ctRow);
            }
            final CTRow rowArray[]=new CTRow[ctRowMap.size()];
            ctRowMap.values().toArray(rowArray);
            getCTWorksheet().getSheetData().setRowArray(rowArray);
        }
    }
}