https://issues.apache.org/bugzilla/show_bug.cgi?id=55066

            Bug ID: 55066
           Summary: Then open XWPFDocument onDocumentRead method dublicate
                    existing Footnotes.
           Product: POI
           Version: 3.9
          Hardware: PC
            Status: NEW
          Severity: critical
          Priority: P2
         Component: XWPF
          Assignee: [email protected]
          Reporter: [email protected]

Then open existing docx document as XWPFDocument, On onDocumentRead method 
initFootnotes method dublicate existing Footnotes in document.

Here is a sample code with comments where there is a duplication:

private void initFootnotes() throws XmlException, IOException {
       for(POIXMLDocumentPart p : getRelations()){
          String relation = p.getPackageRelationship().getRelationshipType();
          if (relation.equals(XWPFRelation.FOOTNOTE.getRelation())) {
             FootnotesDocument footnotesDocument =
FootnotesDocument.Factory.parse(p.getPackagePart().getInputStream());
             this.footnotes = (XWPFFootnotes)p;
             this.footnotes.onDocumentRead();      // THERE ARE WE ALREADY HAVE
XWPFFootnotes WITH ALL DOCUMENT FOOTNOTES

             for(CTFtnEdn ctFtnEdn :
footnotesDocument.getFootnotes().getFootnoteList()) {
                footnotes.addFootnote(ctFtnEdn);   // THERE ARE FOOTNOTES IS
DUBLICATING
             }
          } else if (relation.equals(XWPFRelation.ENDNOTE.getRelation())){
             EndnotesDocument endnotesDocument =
EndnotesDocument.Factory.parse(p.getPackagePart().getInputStream());

             for(CTFtnEdn ctFtnEdn :
endnotesDocument.getEndnotes().getEndnoteList()) {
                endnotes.put(ctFtnEdn.getId().intValue(), new
XWPFFootnote(this, ctFtnEdn));
             }
          }
       }
    }

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