Al Phaba created PDFBOX-4066:
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Summary: Flatten pdf does not remove acroform elements (checkboxes)
Key: PDFBOX-4066
URL: https://issues.apache.org/jira/browse/PDFBOX-4066
Project: PDFBox
Issue Type: Bug
Components: AcroForm, Utilities
Affects Versions: 2.0.8
Reporter: Al Phaba
Attachments: TestForm.pdf, flattenAndMerge.pdf
I have a pdf with a lot of acroforms, I do some manipulation on it which
results in a new pdf. So I have PDF-1 (which is the original one )and PDF-2
(just a duplication of PDF-1), now I want to merge them. Both PDFs have some
acroforms for example: field_a, field_2...
Before I merge them I flatten PDF-1, because I only want to have acrofields
from PDF-2. When I check then my new merged PDF I can see that there are no
visible fields on on the pages from PDF-1 and there are fields on pages of
fields of PDF-2. At the first look it seems ok, but when I inspect the fields I
can see that the merger has renamed all the fields for PDF-2 e.g.
field_a_dummy123, field_b_dummy232 ...
It seems to me, that flattening does not remove the fields and thats why the
PDFMerger from PDFBox will rename the fields for PDF-2 because acrofields need
to be unique.Another guess was that there is a bug in mergeAcroForm()
{code:java}
@Test
public void flattenAndMerge() throws IOException {
File testForm = new
File(classLoader.getResource("./TestForm.pdf").getFile());
byte[] testFormAsByte = Files.readAllBytes(testForm.toPath());
byte[] testFormAsByte2 = Files.readAllBytes(testForm.toPath());
PDDocument pdf1 = PDDocument.load(testFormAsByte);
PDAcroForm acroform = pdf1.getDocumentCatalog().getAcroForm();
acroform.flatten();
Path flattendedPdf = Files.createTempFile("flatten", ".pdf");
pdf1.save(flattendedPdf.toFile());
PDFMergerUtility merger = new PDFMergerUtility();
merger.addSource(new
ByteArrayInputStream(Files.readAllBytes(flattendedPdf)));
merger.addSource(new ByteArrayInputStream(testFormAsByte2));
merger.setDestinationFileName("./build/flattenAndMerge.pdf");
merger.mergeDocuments(MemoryUsageSetting.setupMainMemoryOnly());
}
{code}
Here is my SO Article
[https://stackoverflow.com/questions/48271924/pdfbox-flatten-pdf-does-not-remove-acroform-elements?noredirect=1#comment83544858_48271924]
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