Import of Excel (.xlsx) sheets that the first row has only empty values, or it was generated by applications like LibreOffice Calc, will import the whole sheet including the empty values. The import will retrieve about 65535 rows.

Please note these imports consume a large amount of memory.

1. Create any sheet with LibreOffice with one column and one row of data.
2. Export this sheet as an .xlsx file and create a corresponding data source to load the sheet.
3. Alternatively, create a excel document with the first row with only empty values.
4. Click on 'Load All Records'.

The import shows:

• Header row is null, regenerating workbook using jxl and trying again
• Parsing excel file
• It processes the whole amount of 65535 (incorrect).

The import processor continues to load even the empty rows.

Open the file in Excel and save it as excel 2007 and ensure the first row is NOT empty.