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Posted to dev@pdfbox.apache.org by "Tilman Hausherr (JIRA)" <ji...@apache.org> on 2017/02/07 20:00:44 UTC
[jira] [Resolved] (PDFBOX-3641) ICC_ColorSpace usage is not thread
safe
[ https://issues.apache.org/jira/browse/PDFBOX-3641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tilman Hausherr resolved PDFBOX-3641.
-------------------------------------
Resolution: Fixed
Assignee: Tilman Hausherr
Fix Version/s: 2.1.0
2.0.5
Done, thanks.
> ICC_ColorSpace usage is not thread safe
> ---------------------------------------
>
> Key: PDFBOX-3641
> URL: https://issues.apache.org/jira/browse/PDFBOX-3641
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.4
> Reporter: Mike Kaplinskiy
> Assignee: Tilman Hausherr
> Fix For: 2.0.5, 2.1.0
>
>
> Unfortunately {{ICC_ColorSpace}} is not thread safe. Even creating {{Color}} instances and passing an {{ICC_ColorSpace}} can't be considered thread safe. All color conversion calls lazy initialize a value without a memory barrier: https://github.com/openjdk-mirror/jdk/blob/jdk8u/jdk8u/master/src/share/classes/java/awt/color/ICC_ColorSpace.java#L172 . This seems like a bug in Java, but PDFBox triggers it :(
> PDFBox seems to attempt to initialize colorspaces/colors in a thread-safe way around https://github.com/apache/pdfbox/blob/f419d203ebebc4deb83ba71ef0a0e6bb1ff22c5a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/graphics/color/PDICCBased.java#L146 , but calls to {{toRGB}}/{{fromRGB}} aren't synchronized. I *think* calling all 4 (to/from)(CIEXYZ/RGB) in a locked block *should* initialize the instances enough to be thread safe.
> The symptoms of this problem look like this (exception formatting due to clojure):
> {code}
> org.apache.pdfbox.rendering.PDFRenderer.renderImageWithDPI PDFRenderer.java: 94
> org.apache.pdfbox.rendering.PDFRenderer.renderImage PDFRenderer.java: 145
> org.apache.pdfbox.rendering.PageDrawer.drawPage PageDrawer.java: 189
> org.apache.pdfbox.contentstream.PDFStreamEngine.processPage PDFStreamEngine.java: 149
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStream PDFStreamEngine.java: 446
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators PDFStreamEngine.java: 472
> org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator PDFStreamEngine.java: 815
> org.apache.pdfbox.contentstream.operator.color.SetNonStrokingColorSpace.process SetNonStrokingColorSpace.java: 41
> org.apache.pdfbox.pdmodel.PDResources.getColorSpace PDResources.java: 166
> org.apache.pdfbox.pdmodel.PDResources.getColorSpace PDResources.java: 196
> org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace.create PDColorSpace.java: 182
> org.apache.pdfbox.pdmodel.graphics.color.PDICCBased.<init> PDICCBased.java: 89
> org.apache.pdfbox.pdmodel.graphics.color.PDICCBased.loadICCProfile PDICCBased.java: 145
> java.awt.Color.<init> Color.java: 542
> java.awt.color.ICC_ColorSpace.toRGB ICC_ColorSpace.java: 179
> java.lang.NullPointerException:
> {code}
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