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Subject: Re: NullPointerException from PDDocument
To: users@pdfbox.apache.org
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 <D6B612B2A2D0D2448B3E3F4EC5D3AFA91505AAC187@EX07MAIL3.pgac.com>
From: Tilman Hausherr <THausherr@t-online.de>
Message-ID: <55CA344C.3090004@t-online.de>
Date: Tue, 11 Aug 2015 19:43:40 +0200
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Am 10.08.2015 um 16:25 schrieb Kevin Ternes:
> Thanks Tilman, but I found the problem.  It is not a malformed PDF.
> The PDDocument was being prematurely closed in an earlier method.
>
> I still think it would be good if this method added a description message about the null trailer to the Exception.  With an ordinary NullPointerException, we really have no idea what might have happened.

We'd probably put some messages everywhere.... please accept that if you 
do illegal things, mayhem will follow :-)

Tilman


>
> -----Original Message-----
> From: Tilman Hausherr [mailto:THausherr@t-online.de]
> Sent: Friday, August 07, 2015 5:02 PM
> To: users@pdfbox.apache.org
> Subject: Re: NullPointerException from PDDocument
>
> Can you upload the document somewhere?
>
> Tilman
>
> Am 07.08.2015 um 23:56 schrieb Kevin Ternes:
>> I have a particular PDF that I have loaded that throws a NullPointerException from PDDocument.getDocumentCatalog().
>>   From PDDocument:
>>
>> public PDDocumentCatalog getDocumentCatalog() {
>>         If (documentCatalog == null)
>>         {
>>               COSDictionary trailer = document.getTrailer();
>>               COSBase dictionary = trailer.getDictionaryObject( COSName.ROOT );
>>               if (dictionary instanceof COSDictionary)
>>               {
>>                   documentCatalog = new PDDocumentCatalog(this, (COSDictionary) dictionary);
>>               }
>>               else
>>               {
>>                   documentCatalog = new PDDocumentCatalog(this);
>>               }
>>         }
>>         return documentCatalog;
>> }
>>
>> The document.getTrailer() returns NULL for this PDF and thus the NullPointerException from the next line.
>>
>> Is it possible that the PDF is malformed?
>> I do not see where I might have cleared the document.trailer field.
>>
>> If any PDFBox developers are listening, would it be reasonable to put a check into the above code to deal with the NULL document.trailer?
>>
>>
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