https://issues.apache.org/bugzilla/show_bug.cgi?id=55923

            Bug ID: 55923
           Summary: Xml data export leads to a NPE sorting output data
           Product: POI
           Version: 3.9
          Hardware: PC
            Status: NEW
          Severity: normal
          Priority: P2
         Component: XSSF
          Assignee: [email protected]
          Reporter: [email protected]

The class XSSFExportToXml fails when comparing two similiar xPaths. It
continous comparing the xPath nodes after the last common node which then leads
to a null pointer exception.

Example
-----------

Given to xPaths:

1. A/B/C/E
2. A/B/D/E

Expected behaviour: Iterating up to node B. Testing if C or D appears first in
the schema xml.

Actual beahviour: It continous comparing node E after node C/D whichs then
leads to a NPE.

I'm going to provide a patch for this issue.

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