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https://issues.apache.org/jira/browse/PDFBOX-2633?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14293802#comment-14293802
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Maruan Sahyoun commented on PDFBOX-2633:
----------------------------------------
it’s doable using the low level APIs and extending some of the current
functionality of PDFBox.
What I meant with _not supported_ is that loading the pdf, changing the XFA and
doing a saveIncremental() wouldn’t work as this is currently only implemented
to handle signing and is ignoring other changes which might have been made to
the PDF such as changing the XFA.
> 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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