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https://issues.apache.org/jira/browse/PDFBOX-4028?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16280504#comment-16280504
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Tilman Hausherr commented on PDFBOX-4028:
-----------------------------------------
SaveIncremental is used only for signing. It does not work very well on other
incremental changes, this is one of the oldest issues (PDFBOX-45). Please
submit a test case, i.e. a PDF file that is corrupted by your code. Please
complete the code to show the smallest possible change to the PDF that triggers
the effect. I know only about trouble when there is a signature in the PDF.
> SaveIncremental on same opened file
> -----------------------------------
>
> Key: PDFBOX-4028
> URL: https://issues.apache.org/jira/browse/PDFBOX-4028
> Project: PDFBox
> Issue Type: Bug
> Components: Writing
> Affects Versions: 2.0.8
> Reporter: Martin Mancuska
>
> The incremental save does not work correctly if it is done on the same opened
> document. It produces corrupted file. The save incremental should append
> changes at the end of file (after last origin EOF).
> Newly saved file contains changes also in the middle of the file not only at
> the end. Changes in the middle of file contains zeroed bytes or garbage.
> Tested with the latest stable version of PDFBox 2.0.8.
>
> Sample code:
> {code:java}
> String fileName = "/path/to/document.pdf";
> PDDocument doc = PDDocument.load((new File(fileName));
> ...
> document changes
> ...
> try ( OutputStream outStream = new FileOutputStream(fileName)) {
> doc.saveIcremental(outStream);
> }
> catch ....
> ...
> {code}
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