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Posted to dev@pdfbox.apache.org by "Travis Schneeberger (JIRA)" <ji...@apache.org> on 2017/06/08 15:20:18 UTC
[jira] [Reopened] (PDFBOX-3751) Flattening a pdf with
refreshAppearances set to true causes a NullPointerException
[ https://issues.apache.org/jira/browse/PDFBOX-3751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Travis Schneeberger reopened PDFBOX-3751:
-----------------------------------------
[~msahyoun] So sorry I didn't get around to test this earlier. I'm testing your 2.0.6 release and this problem still exists. I see that you made PDPushButton. constructAppearances() no op. I believe this same change might be needed in PDButton.java.
The following stacktrace still happens without my documented workaround.
java.lang.NullPointerException
at org.apache.pdfbox.pdmodel.interactive.form.PDButton.updateByValue(PDButton.java:356)
at org.apache.pdfbox.pdmodel.interactive.form.PDButton.constructAppearances(PDButton.java:285)
at org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm.refreshAppearances(PDAcroForm.java:348)
at org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm.flatten(PDAcroForm.java:223)
> Flattening a pdf with refreshAppearances set to true causes a NullPointerException
> ----------------------------------------------------------------------------------
>
> Key: PDFBOX-3751
> URL: https://issues.apache.org/jira/browse/PDFBOX-3751
> Project: PDFBox
> Issue Type: Bug
> Components: AcroForm
> Affects Versions: 2.0.5
> Reporter: Travis Schneeberger
> Assignee: Maruan Sahyoun
> Fix For: 2.0.6, 3.0.0
>
> Attachments: fdpAttachment2.pdf
>
>
> Flattening a pdf with refreshAppearances set to true causes a NullPointerException. This is because some fields do not have a NormalAppearance set.
> For example:
> {code}
> try(PDDocument pdfDocument = PDDocument.load(new File("/Users/travis/Desktop/fdpAttachment2.pdf"))) {
> pdfDocument.getDocumentCatalog().getAcroForm().flatten(pdfDocument.getDocumentCatalog().getAcroForm().getFields(), true);
> }
> {code}
> causes:
> {quote}
> Exception in thread "main" java.lang.NullPointerException
> at org.apache.pdfbox.pdmodel.interactive.form.PDButton.updateByValue(PDButton.java:356)
> at org.apache.pdfbox.pdmodel.interactive.form.PDButton.constructAppearances(PDButton.java:285)
> at org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm.refreshAppearances(PDAcroForm.java:348)
> at org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm.flatten(PDAcroForm.java:223)
> at org.kuali.coeus.sys.pdf.FlattenException.main(FlattenException.java:13)
> {quote}
> The workaround is pretty simple. Just make sure every widget without a NormalAppearance has one before calling flatten. I would think pdfbox could do a null check internally when trying to refresh appearance.
> {code}
> pdfDocument.getDocumentCatalog().getAcroForm().getFields()
> .stream()
> .flatMap(f -> f.getWidgets().stream())
> .filter(w -> w.getAppearance() == null)
> .forEach(w -> {
> final PDAppearanceDictionary appearance = new PDAppearanceDictionary(new COSDictionary());
> appearance.setNormalAppearance(new PDAppearanceEntry(new COSDictionary()));
> w.setAppearance(appearance);
> });
> {code}
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