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https://issues.apache.org/jira/browse/PDFBOX-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15367841#comment-15367841
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Tilman Hausherr edited comment on PDFBOX-3404 at 7/8/16 3:48 PM:
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Thanks for the feedback and the very helpful error reports and the test case!
was (Author: tilman):
Thanks for the feedback!
> Threads using PDFBox getting stuck when using standard 14 fonts
> ---------------------------------------------------------------
>
> Key: PDFBOX-3404
> URL: https://issues.apache.org/jira/browse/PDFBOX-3404
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 2.0.0, 2.0.2, 2.0.3, 2.1.0
> Reporter: Tilman Hausherr
> Assignee: Tilman Hausherr
> Labels: multithreading
> Fix For: 2.0.3, 2.1.0
>
>
> user [~prstahle] reports:
> {quote}
> We have a relatively heavily threaded application which is calling pdfbox to
> stamp certain
> pdf files. We have been in production for a little over a week and have run
> into a few threads
> getting stuck. The stack trace is the following:
> {quote}
> {code}
> ### Thread id=34, name="dispatch_2_20160626211454_1064"
> # ThreadInfo: "dispatch_2_20160626211454_1064" Id=34 RUNNABLE
> # CPU: threadCpuTime=49,541,548.824 ms, threadUserTime=49,538,533.066 ms
> # Contention: blockedCount=33 , blockedTime=123 ms
> # Contention: lockName=null , lockOwnerId=-1, lockOwnerName=null
> java.util.HashMap.put(HashMap.java:473)
> java.util.HashSet.add(HashSet.java:217)
> java.util.AbstractCollection.addAll(AbstractCollection.java:334)
> org.apache.pdfbox.pdmodel.font.encoding.Encoding.contains(Encoding.java:109)
> org.apache.pdfbox.pdmodel.font.PDType1Font.encode(PDType1Font.java:343)
> org.apache.pdfbox.pdmodel.font.PDFont.encode(PDFont.java:286)
> org.apache.pdfbox.pdmodel.font.PDFont.getStringWidth(PDFont.java:315)
> com.tycoelectronics.emcs.stamppdf.StampEnginePDFBox.getLongestTextWidth(StampEnginePDFBox.java:1369)
> {code}
> {quote}
> We seem to be getting stuck in PDFont classes HashMap which is unsynchronized
> class.
> {quote}
> {quote}
> We are using "PDType1Font.HELVETICA".
> {quote}
> The problem is that for the standard 14 fonts, each font is a singleton, but
> its code is being used multithreaded, so we have to secure that.
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