Excel 2016 and Libre Office don't complain.
Can you upload you generated file somewhere - so i can compare it against mine?
my first guess was, that I would close the FileOutputStream ... but at least in 
my environment your code works.
I assume you have read the FAQ and don't mix POI versions and use the latest 
schemas ...

Andi

On 18.03.2016 20:09, Paul Slootweg wrote:
>   Workbook wb = new XSSFWorkbook();
>
>     Sheet sh = wb.createSheet("Sheet1");
>
>     Row r = sh.createRow(0);
>
>     Cell c = r.createCell(0);
>     c.setCellValue("Cell1");
>
>     wb.write(new FileOutputStream("file.xlsx"));



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