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Posted to dev@pdfbox.apache.org by "Andreas Lehmkühler (Jira)" <ji...@apache.org> on 2019/12/18 18:59:00 UTC
[jira] [Closed] (PDFBOX-4472) Thread stuck in
SoftReferenceCache.get
[ https://issues.apache.org/jira/browse/PDFBOX-4472?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andreas Lehmkühler closed PDFBOX-4472.
--------------------------------------
> Thread stuck in SoftReferenceCache.get
> --------------------------------------
>
> Key: PDFBOX-4472
> URL: https://issues.apache.org/jira/browse/PDFBOX-4472
> Project: PDFBox
> Issue Type: Bug
> Components: JBIG2
> Affects Versions: 3.0.2 JBIG2
> Reporter: Arnaud Jeansen
> Assignee: Tilman Hausherr
> Priority: Major
> Fix For: 3.0.3 JBIG2
>
> Attachments: 0001-PDFBOX-4472-Enforce-access-to-the-weak-cache-through.patch
>
>
> We use pdfbox-jbig2 3.02 in a multi-threaded environment, and the SoftReferenceCache implementation is a problem because of its usage of an unsynchronized WeakHashMap.
> Today, we found two threads blocking each other with the same stack trace:
> {code:java}
> pool-95-thread-1 - priority:5 - threadId:0x00007f882c109800 - nativeId:0x3d81 - nativeId (decimal):15745 - state:RUNNABLE
> stackTrace:
> java.lang.Thread.State: RUNNABLE
> at java.util.WeakHashMap.get(WeakHashMap.java:403)
> at org.apache.pdfbox.jbig2.util.cache.SoftReferenceCache.get(SoftReferenceCache.java:40)
> at org.apache.pdfbox.jbig2.JBIG2ImageReader.read(JBIG2ImageReader.java:243)
> at javax.imageio.ImageReader.read(ImageReader.java:939)
> at sun.reflect.GeneratedMethodAccessor3824.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at org.icepdf.core.pobjects.graphics.images.JBig2Decoder.decodeJbig2(JBig2Decoder.java:161)
> at org.icepdf.core.pobjects.graphics.images.JBig2Decoder.decode(JBig2Decoder.java:80)
> at org.icepdf.core.pobjects.graphics.images.ImageStream.getImage(ImageStream.java:94)
> at org.icepdf.core.pobjects.graphics.images.references.ImageStreamReference.call(ImageStreamReference.java:74)
> at org.icepdf.core.pobjects.graphics.images.references.ImageStreamReference.call(ImageStreamReference.java:40)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> Locked ownable synchronizers:
> - <0x0000000600019a48> (a java.util.concurrent.ThreadPoolExecutor$Worker)
> {code}
> I couldn't manage to write a unit test to reproduce the problem unfortunately. But the patch is straightforward and attached to this ticket.
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