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https://issues.apache.org/jira/browse/PDFBOX-5381?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17498572#comment-17498572
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Andreas Lehmkühler commented on PDFBOX-5381:
--------------------------------------------
[~tilman] Is this specific for the attached file or did you observe the same
behaviour for others or maybe all others?
> Catalog object twice in signed file
> -----------------------------------
>
> Key: PDFBOX-5381
> URL: https://issues.apache.org/jira/browse/PDFBOX-5381
> Project: PDFBox
> Issue Type: Bug
> Components: Signing
> Affects Versions: 3.0.0 PDFBox
> Reporter: Tilman Hausherr
> Priority: Major
> Labels: regression
> Fix For: 3.0.0 PDFBox
>
> Attachments: PDFA_signed.pdf
>
>
> The catalog object is twice in the signed file
> {noformat}
> 1 0 obj
> <<
> /Type /Catalog
> /Version /1.4
> /Pages 2 0 R
> /Metadata 3 0 R
> /OutputIntents [4 0 R]
> /Perms 18 0 R
> /AcroForm <<
> /Fields [22 0 R]
> /SigFlags 3
> >>
> >>
> endobj
> 1 0 obj
> <<
> /Type /Catalog
> /Version /1.4
> /Pages 2 0 R
> /Metadata 3 0 R
> /OutputIntents [4 0 R]
> /Perms 18 0 R
> /AcroForm <<
> /Fields [22 0 R]
> /SigFlags 3
> >>
> >>
> endobj
> {noformat}
> here's a failing test, to be added at the end of CreatePDFATest.java (and
> probably elsewhere)
> {code}
> // Check that no object numbers are double
> File signedFile = new File(signedPdfaFilename);
> BufferedReader br = new BufferedReader(new InputStreamReader(new
> FileInputStream(signedFile)));
> String line;
> boolean isIncrementalArea = false;
> Set<String> set = new HashSet<>();
> int linePos = 0;
> while ((line = br.readLine()) != null)
> {
> ++linePos;
> if (line.equals("%%EOF"))
> {
> isIncrementalArea = true;
> }
> if (!isIncrementalArea)
> continue;
> if (line.matches("^\\d+ 0 obj$"))
> {
> int pos = line.indexOf(" 0 obj");
> line = line.substring(0, pos);
> assertFalse(set.contains(line), "object '" + line + " 0 obj' twice in
> incremental part of PDF at line " +linePos);
> set.add(line);
> }
> }
> br.close();
> {code}
> I don't know why it happens (although I remember I had such a thing years ago
> when trying different strategies while working on incremental saving in
> PDFBOX-45)
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