NPE on OPCPackage

[João Miguel Penetra]

Hello,

I have a web site where users can upload CSV and XLSX files and I use
Apache-POI to parse XLSX files. However, I discovered something unusual.
When I convert a CSV file to XLSX on Excel 2013 I get a NPE while
initializing XSSFReader:

 java.lang.NullPointerException
at org.apache.poi.openxml4j.opc.OPCPackage.getPart(OPCPackage.java:625)
at org.apache.poi.xssf.eventusermodel.XSSFReader.<init>(XSSFReader.java:67)

file.exists() returns true.

I asked someone to convert the same file for me with Excel 2011 and the
error disappears. I've tried this with poi-3.11 and 3.9 and respective
dependencies with the same result.

Sample files are attached.

Thanks,
João Miguel Penetra

test_excel_2011.xlsx
Description: MS-Excel 2007 spreadsheet

test_excel_2013.xlsx
Description: MS-Excel 2007 spreadsheet

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