https://issues.apache.org/bugzilla/show_bug.cgi?id=48544

           Summary: Example code XLSX2CSV fails when shared string table
                    is missing
           Product: POI
           Version: 3.6
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XSSF
        AssignedTo: [email protected]
        ReportedBy: [email protected]


Created an attachment (id=24844)
 --> (https://issues.apache.org/bugzilla/attachment.cgi?id=24844)
Patch to ReadOnlySharedStringTable class constructor

I contributed code as Bug 47757 that converts an XLSX workbook to CSV format. 
The class is here:

http://svn.apache.org/repos/asf/poi/trunk/src/examples/src/org/apache/poi/xssf/eventusermodel/XLSX2CSV.java

I recently found a bug in an embedded class, ReadonlySharedStringsTable, that
is triggered by a workbook that contains only numbers and therefore has no
shared strings table.  I've attached a small patch that revises the constructor
to check that the ArrayList of package parts is not empty before grabbing the
first item.  Hope this helps.

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