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From: Gilad Denneboom <gilad.denneboom@gmail.com>
Date: Mon, 3 Jun 2013 15:01:03 +0200
Message-ID: 
 <CAKLHnLx4g8B9gxKyExBzV7NTDKQvRMceyQtzhy8rmcqxSzYaLw@mail.gmail.com>
Subject: Re: Merging a lot of small pdf documents (1/2 pages) into one pdf
 document
To: "users@pdfbox.apache.org" <users@pdfbox.apache.org>,
 mihaela olteanu <mihaela_ol@yahoo.com>
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Try loading the file using a scratch file:
http://pdfbox.apache.org/apidocs/org/apache/pdfbox/pdmodel/PDDocument.html#load(java.lang.String,%20org.apache.pdfbox.io.RandomAccess)

 This will help lessen the memory load.


On Mon, Jun 3, 2013 at 2:50 PM, mihaela olteanu <mihaela_ol@yahoo.com>wrote:

> Hello,
>
> I have a use case where I need to merge a large number of small pdf
> document (hundred of thousands) into one pdf document.
> Currently I am using the
> method: org.apache.pdfbox.util.PDFMergerUtility.appendDocument(destination,
> source); for all the source documents, not directly mergeDocuments() method
> in the same class because I need to also add some bookmarks. Finally I save
> the document.
>
> Is it a better way of doing this with a lower memory footprint? I tried
> importing each page from the source documents by using the method
> PDDocument.importPage() but still throws errors in version 1.8.2.
>
> When I call PDDocument.load(File) the whole document is loaded in memory?
> If so, it means that saving the generated pdf after merging a subset of
> documents and then reloading it would not decrease the memory use anyway ...
>
> Could somebody point me to the right way of doing this?
>
> Thanks,
> Mihaela

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