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https://issues.apache.org/jira/browse/PDFBOX-3751?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Maruan Sahyoun reassigned PDFBOX-3751:
--------------------------------------
Assignee: Maruan Sahyoun
> 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
>
> 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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