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https://issues.apache.org/jira/browse/PDFBOX-3732?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15998734#comment-15998734
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Maruan Sahyoun commented on PDFBOX-3732:
----------------------------------------
For the sample form created by the above code from [~tilman] Adobe Reader will
add {{/Helv}} and {{ZaDb}} resource entries to the PDF see
[^PDFBOX3732-minimal-reader.pdf]].
For the file [^out.pdf] again {{/Helv}} and {{ZaDb}} are added. In addition the
{{/F1}} entry from the appearance stream resources is taken and added to the
AcroForm {{/DR}} entry.
So I suggest to not implement the patch as is but replicate Adobe Acrobats
behavior.
> IllegalArgumentException when refreshing an appearance and no font resources
> are defined
> ----------------------------------------------------------------------------------------
>
> Key: PDFBOX-3732
> URL: https://issues.apache.org/jira/browse/PDFBOX-3732
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.5
> Reporter: simon steiner
> Fix For: 2.0.6, 3.0.0
>
> Attachments: out.pdf, out-reader.pdf, PDFBOX3732-minimal.pdf,
> PDFBOX3732-minimal-reader.pdf, refreshAppearances.patch
>
>
> PDDocument doc = PDDocument.load(new File("out.pdf"));
> doc.getDocumentCatalog().getAcroForm().setNeedAppearances(false);
> doc.getDocumentCatalog().getAcroForm().refreshAppearances();
> doc.save("pdfbox.pdf");
> doc.close();
> Exception in thread "main" java.lang.IllegalArgumentException: /DR is a
> required entry
> at
> org.apache.pdfbox.pdmodel.interactive.form.PDDefaultAppearanceString.<init>(PDDefaultAppearanceString.java:82)
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