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https://issues.apache.org/jira/browse/PDFBOX-3404?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15353624#comment-15353624
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ASF subversion and git services commented on PDFBOX-3404:
---------------------------------------------------------
Commit 1750577 from [~tilman] in branch 'pdfbox/branches/2.0'
[ https://svn.apache.org/r1750577 ]
PDFBOX-3382, PDFBOX-3404: use concurrentHashMap for standard 14 fonts; remove
double WinAnsiEncoding assignment and use it as a singleton; remove unused field
> 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
>
> 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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