JHOVE Error Messages

In my sample, I have found 35 error messages concerning invalid or malformed (or both) PDF Files:

1. PdfMalformedException: Invalid name tree Offset: 541014
2. Invalid destination object
3. Expected dictionary for font entry in page resource
4. Invalid object number in cross-reference stream
5. Annotation object is not a dictionary
6. Invalid object number or object stream
7. Improperly constructed page tree
8. Invalid Page tree node
9. Invalid Annotation property
10. Invalid Resources Entry in document
11. Invalid outline dictionary item
12. Compression method is invalid or unknown to JHOVE
13. Improperly formed date
14. Invalid page dictionary object
15. Lexical Error
16. No document catalog dictionary
17. Malformed dictionary
18. Invalid Font entry in Resources
19. Invalid character in hex string
20. Malformed outline dictionary
21. Invalid dictionary data for page
22. No PDF Header
23. Missing expected element in page number dictionary
24. java.lang.ClassCastException: PdfSimpleObject cannot be cast to edu.harvard.hul.ois.jhove.module.pdf.PdfDictionary
25. java.lang.NullPointerException
26. Invalid Names dictionary
27. Improperly nested array delimiters
28. Invalid cross-reference table
29. Invalid ID in trailer
30. Invalid object definition
31. Unexpected error in findFonts
32. Invalid outline dictionary object
33. Outline dictionary missing required entry
34. Malformed filter
35. Improperly constructed page tree

Relevant for PDF/A-compliance are these messages:

1. No encryption dictionary
2. No Encrypt or Info entries in trailer
3. Document catalog dictionary specifies RFC1766 language
4. Document catalog dictionary has no AA or OCProperties
5. Form fields do not have AA actions
6. No Launch, Sound, Movie, ResetForm, ImportData, or JavaScript actions
7. Fonts have recognized encoding
8. Uncalibrated color spaces have OutputIntent specified
9. Page objects do not have Movie, Sound, or FileAttachment
10. Non-text annotations have Contents key
11. Unfiltered metadata stream

A typical sample of 4145 PDF files from our Open Access Repository consists of 233 invalid PDF Files and outputs the following error messages:

Sample consists of 31 different JHOVE error messages
1: 390 x   ErrorMessage: Annotation object is not a dictionary
2: 82 x   ErrorMessage: Compression method is invalid or unknown to JHOVE
3: 862 x   ErrorMessage: Expected dictionary for font entry in page resource
4: 245 x   ErrorMessage: Improperly constructed page tree
5: 42 x   ErrorMessage: Improperly formed date
6: 1 x   ErrorMessage: Improperly nested array delimiters
7: 131 x   ErrorMessage: Invalid Annotation property
8: 5 x   ErrorMessage: Invalid Font entry in Resources
9: 2 x   ErrorMessage: Invalid Names dictionary
10: 93 x   ErrorMessage: Invalid Resources Entry in document
11: 5 x   ErrorMessage: Invalid character in hex string
12: 1 x   ErrorMessage: Invalid cross-reference table
13: 44 x   ErrorMessage: Invalid destination object
14: 4 x   ErrorMessage: Invalid dictionary data for page
15: 470 x   ErrorMessage: Invalid object number in cross-reference stream
16: 68 x   ErrorMessage: Invalid object number or object stream
17: 86 x   ErrorMessage: Invalid outline dictionary item
18: 23 x   ErrorMessage: Invalid page dictionary object
19: 169 x   ErrorMessage: Invalid page tree node
20: 10 x   ErrorMessage: Lexical error
21: 2 x   ErrorMessage: Malformed dictionary
22: 4 x   ErrorMessage: Malformed dictionary: Vector must contain an even number of objects, but has 15
23: 5 x   ErrorMessage: Malformed outline dictionary
24: 4 x   ErrorMessage: Missing expected element in page number dictionary
25: 5 x   ErrorMessage: No PDF header
26: 8 x   ErrorMessage: No document catalog dictionary
27: 1055 x   ErrorMessage: edu.harvard.hul.ois.jhove.module.pdf.PdfInvalidException: Invalid destination object
28: 2440 x   ErrorMessage: edu.harvard.hul.ois.jhove.module.pdf.PdfMalformedException: Invalid name tree
29: 287 x   ErrorMessage: edu.harvard.hul.ois.jhove.module.pdf.PdfMalformedException: Invalid object number or object stream
30: 2 x   ErrorMessage: java.lang.ClassCastException: edu.harvard.hul.ois.jhove.module.pdf.PdfSimpleObject cannot be cast to edu.harvard.hul.ois.jhove.module.pdf.PdfDictionary
31: 2 x   ErrorMessage: java.lang.NullPointerException