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https://issues.apache.org/jira/browse/PDFBOX-988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13651111#comment-13651111
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Andreas Lehmkühler commented on PDFBOX-988:
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I ran some tests on my fedora box. I can confirm that convertToImage hangs
everytime I use a java 1.5 JVM regardless of which version of PDFBox I use. Any
other combination starting with PDFBox 1.3.1 works fine.
> pdmodel.font.PDSimpleFont hanging on TrueType font (ubuntu)
> -----------------------------------------------------------
>
> Key: PDFBOX-988
> URL: https://issues.apache.org/jira/browse/PDFBOX-988
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 1.5.0
> Environment: Ubuntu 8.04 - Headless
> Reporter: Craig Stires
> Attachments: F001u_3_7j.pdf,
> pdsimplefont_rebuildfont_fewglyphs_40.patch,
> pdsimplefont_rebuildfont_fewglyphs.patch
>
>
> When calling PDPage.convertToImage(imagetype,resolution) , I have found a
> case where the application hangs. No error messages, no exceptions, no CPU
> spike, no I/O. The error had to do with some strange corruption of the
> awtFont, by the time it reached the method PDSimpleFont.drawString. Some
> pretty deep digging turned up that if a font with too few glyphs is sent into
> PDSimpleFont.writeFont, it will enter Graphics2D.drawString ... ne'er to
> return.
> If a check is done to count the glyphs and if they fall below a certain
> threshold, then just re-instantiate the Font, then all goes well. Typical
> numbers range from 70 to 1000+, so I've gone with an arbitrary value of 40.
> All goes well, and I can't measure any difference in performance (except that
> my app will actually return from attempting this doc!).
> Attached is a sample PDF which can re-create the problem, and a patch which
> seems to solve it sensibly.
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