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https://issues.apache.org/jira/browse/PDFBOX-2633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14293739#comment-14293739
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dennis lucero commented on PDFBOX-2633:
---------------------------------------
So filling out a form in a signed document is currently not supported?
http://www.lawandsoftware.com/blog/filling-xfa-pdf-forms-using-pdfbox/
seems to indicate that incremental saving of PDF files is possible on PDFBox
(although no example is provided).
> saveIncremental java.lang.NullPointerException
> ----------------------------------------------
>
> Key: PDFBOX-2633
> URL: https://issues.apache.org/jira/browse/PDFBOX-2633
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 1.8.8
> Reporter: dennis lucero
>
> Loading a document and saving it via saveIncremental throws
> java.lang.NullPointerException.
> PDDocument doc = PDDocument.load(input);
> doc.saveIncremental(...);
> ----
> Exception in thread "..." java.lang.NullPointerException
> at
> org.apache.pdfbox.pdfparser.PDFXRefStream.getStream(PDFXRefStream.java:90)
> at
> org.apache.pdfbox.pdfwriter.COSWriter.doWriteXRefInc(COSWriter.java:697)
> at
> org.apache.pdfbox.pdfwriter.COSWriter.visitFromDocument(COSWriter.java:1139)
> at org.apache.pdfbox.cos.COSDocument.accept(COSDocument.java:578)
> at org.apache.pdfbox.pdfwriter.COSWriter.write(COSWriter.java:1516)
> at
> org.apache.pdfbox.pdmodel.PDDocument.saveIncremental(PDDocument.java:1397)
> at
> org.apache.pdfbox.pdmodel.PDDocument.saveIncremental(PDDocument.java:1372)
> at ...
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