[PDFBOX-4222] PDFMergerUtility: java.lang.ClassCastException: org.apache.pdfbox.cos.COSDictionary cannot be cast to org.apache.pdfbox.cos.COSNumber

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.9
• Fix Version/s: 2.0.10, 3.0.0 PDFBox
• Component/s: Utilities
• Environment: Ubuntu 14.04 and Windows 7
• Assignee: Tilman Hausherr
• Reporter: Eduard von Feek
• Created: 16/May/18 13:39
• Updated: 21/Jun/18 20:27
• Resolved: 17/May/18 20:32

Description

Given a problematic PDF, there can be ClassCastException when merging two PDFs, causing the merge to fail.

 

Problematic example PDF: https://bibliothek.wzb.eu/pdf/2001/ii01-303.pdf

 

Provoking command line:

 java -jar pdfbox-app-2.0.9.jar PDFMerger ii01-303.pdf ii01-303.pdf out.pdf

 

Stacktrace:

Exception in thread "main" java.lang.ClassCastException: org.apache.pdfbox.cos.COSDictionary cannot be cast to org.apache.pdfbox.cos.COSNumber
 at org.apache.pdfbox.multipdf.PDFMergerUtility.appendDocument(PDFMergerUtility.java:504)
 at org.apache.pdfbox.multipdf.PDFMergerUtility.mergeDocuments(PDFMergerUtility.java:263)
 at org.apache.pdfbox.tools.PDFMerger.merge(PDFMerger.java:70)
 at org.apache.pdfbox.tools.PDFMerger.main(PDFMerger.java:49)
 at org.apache.pdfbox.tools.PDFBox.main(PDFBox.java:81)