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Date: Fri, 01 Aug 2014 21:47:45 +0200
From: Tilman Hausherr <THausherr@t-online.de>
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To: users@pdfbox.apache.org
Subject: Re: Problems running PDFBox within a servlet container
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Yes, that is what I mean, my text was unclear. One PDDocument may be 
accessed only by one thread.

Tilman

Am 01.08.2014 21:16, schrieb Brzrk One:
> In my experience, parsing the PDF fails badly when the
> PDDocument is accessed by more than one thread.
> Usually in the decompression and decryption, but not exclusively.
> Certainly the thread model is different btwn a standalone app and a servlet.
>
>
> On Fri, Aug 1, 2014 at 3:07 PM, Tilman Hausherr <THausherr@t-online.de>
> wrote:
>
>> I once got similar exceptions when trying to access the same PDF from
>> several threads. See also
>>
>> https://pdfbox.apache.org/userguide/faq.html#threadsafe
>>
>> Tilman
>>
>> Am 01.08.2014 19:20, schrieb Jonathan Carr:
>>
>>> Hello all
>>>
>>> I've written code to take an existing PDF containing a form, populate
>>> values in some of the fields, and then output the results as a new PDF. As
>>> a standalone test class this works great, however as soon as put the code
>>> into a servlet (I wish to serve the resulting PDF to users as a download)
>>> I
>>> get an error. The PDFBox-related code and PDF document being used are
>>> exactly the same in both cases.
>>>
>>> Clearly there's a difference between the servlet and non-servlet
>>> environments, but so far I've failed to find it. Does anyone have any
>>> suggestions as to where I should be looking?
>>>
>>> I'm running OpenJDK 7 and pdfbox-1.8.6, with Jetty as my servlet
>>> container.
>>>
>>> Example code:
>>>
>>> InputStream in = MyServlet.class.getResourceAsStream("Form.pdf");
>>> PDDocument doc = PDDocument.load(in);
>>> PDDocumentCatalog cat = doc.getDocumentCatalog();
>>> PDAcroForm acroForm = cat.getAcroForm();
>>>
>>> PDField field = acroForm.getField("myField");
>>> field.setValue("someValue");
>>>
>>>
>>> The following error is thrown when setValue() is called:
>>>
>>> java.io.IOException: null
>>> at org.apache.pdfbox.filter.FlateFilter.decode(FlateFilter.java:110)
>>> ~[pdfbox-app-1.8.6.jar:na]
>>> at org.apache.pdfbox.cos.COSStream.doDecode(COSStream.java:342)
>>> ~[pdfbox-app-1.8.6.jar:na]
>>> at org.apache.pdfbox.cos.COSStream.doDecode(COSStream.java:254)
>>> ~[pdfbox-app-1.8.6.jar:na]
>>> at org.apache.pdfbox.cos.COSStream.getUnfilteredStream(
>>> COSStream.java:188)
>>> ~[pdfbox-app-1.8.6.jar:na]
>>> at
>>> org.apache.pdfbox.pdfparser.PDFStreamParser.<init>(
>>> PDFStreamParser.java:122)
>>> ~[pdfbox-app-1.8.6.jar:na]
>>> at
>>> org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.
>>> getStreamTokens(PDAppearance.java:186)
>>> ~[pdfbox-app-1.8.6.jar:na]
>>> at
>>> org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.
>>> getStreamTokens(PDAppearance.java:159)
>>> ~[pdfbox-app-1.8.6.jar:na]
>>> at
>>> org.apache.pdfbox.pdmodel.interactive.form.PDAppearance.
>>> setAppearanceValue(PDAppearance.java:266)
>>> ~[pdfbox-app-1.8.6.jar:na]
>>> at
>>> org.apache.pdfbox.pdmodel.interactive.form.PDVariableText.setValue(
>>> PDVariableText.java:131)
>>> ~[pdfbox-app-1.8.6.jar:na]
>>> ...
>>>
>>> Caused by:
>>>
>>> java.util.zip.DataFormatException: incorrect header check
>>> at java.util.zip.Inflater.inflateBytes(Native Method) ~[na:1.7.0_55]
>>> at java.util.zip.Inflater.inflate(Inflater.java:259) ~[na:1.7.0_55]
>>> at java.util.zip.Inflater.inflate(Inflater.java:280) ~[na:1.7.0_55]
>>> at org.apache.pdfbox.filter.FlateFilter.decompress(FlateFilter.java:129)
>>> ~[pdfbox-app-1.8.6.jar:na]
>>> at org.apache.pdfbox.filter.FlateFilter.decode(FlateFilter.java:102)
>>> ~[pdfbox-app-1.8.6.jar:na]
>>> ...
>>>
>>>
>>> Many thanks
>>> -Jonathan
>>>
>>>