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From: Roberto Nibali <rnibali@gmail.com>
Date: Thu, 8 Oct 2015 13:35:42 +0200
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 <CAONxwYN-jKdsBQBKVT8GDmeGuf-6X9LJbGE8P5O1r5m_oEh7xw@mail.gmail.com>
Subject: Re: PDFont - thread save?
To: users@pdfbox.apache.org
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Hi

Short answer: from the pdfbox FAQ entry (
https://pdfbox.apache.org/1.8/faq.html#threadsafe) point of view: no,
generally you cannot assume thread-safety with the pdfbox library.

However, it is my personal experience that you can easily parallelize
certain tasks calling pdfbox library methods using a miminal amount of care
and design in the way you invoke and synchronize the threads.

With regard to your issue, I'm afraid that you would need to provide more
information:

   - What is the exact error message you get?
   - How exactly is your libertine_R variable defined? E.g.: a global
   static final PDFont?
   - How do you use your libertine_R variable inside the threads?
   - Could you share some more of your code, especially the part of the
   worker threads?
   - Which framework do you use for your multi-threaded approach?


Best regards
Roberto


On Thu, Oct 8, 2015 at 11:59 AM, M. Niedermair <m_g_n@gmx.de> wrote:

> Hello there,
>
> I load the font "Linux Libertine" in a factory as a singleton (I create
> several hundred PDFs with this font.).
>
> libertine_R = PDTrueTypeFont.loadTTF(document,
>    FontLibertine.class.getResourceAsStream("ttf/LinLibertine_Rah.ttf"));
>
> In single-threaded, this also works without problems.
> But if I start multiple threads that use the Font singelton, there is an
> error. I run four threads per core (4x8 = 32).
>
> As a stopgap, I load the font in each thread individually.
> Is there a better solution?
>
> Michael
>
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