Travis Schneeberger created PDFBOX-3751:
-------------------------------------------
Summary: 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
Affects Versions: 2.0.5
Reporter: Travis Schneeberger
Fix For: 2.0.6
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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