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https://issues.apache.org/jira/browse/PDFBOX-2862?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14619907#comment-14619907
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Tilman Hausherr commented on PDFBOX-2862:
-----------------------------------------
>From the trace, it looks like there are several users who access
>GlyphList.DEFAULT, and thus, the two private HashMap in GlyphList, at the same
>time. Please try replacing {{new HashMap}} with {{new HashTable}} everywhere
>in GlyphList.java.
> GlyphList doesn't appear to be thread safe in trunk...or user error?
> --------------------------------------------------------------------
>
> Key: PDFBOX-2862
> URL: https://issues.apache.org/jira/browse/PDFBOX-2862
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Tim Allison
>
> This could be user error, but I'm getting the following when running trunk in
> a multithreaded environment.
> {noformat}
> Caused by: java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:922)
> at java.util.HashMap$EntryIterator.next(HashMap.java:962)
> at java.util.HashMap$EntryIterator.next(HashMap.java:960)
> at java.util.HashMap.putAllForCreate(HashMap.java:554)
> at java.util.HashMap.<init>(HashMap.java:298)
> at
> org.apache.pdfbox.pdmodel.font.encoding.GlyphList.<init>(GlyphList.java:114)
> at
> org.apache.pdfbox.text.PDFTextStreamEngine.<init>(PDFTextStreamEngine.java:103)
> at
> org.apache.pdfbox.text.PDFTextStripper.<init>(PDFTextStripper.java:196)
> at
> org.apache.tika.parser.pdf.PDF2XHTML.<init>(PDF2XHTML.java:106)
> at org.apache.tika.parser.pdf.PDF2XHTML.process(PDF2XHTML.java:133)
> at org.apache.tika.parser.pdf.PDFParser.parse(PDFParser.java:132)
> at
> org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:281)
> ... 16 more
> {noformat}
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