GlyphList doesn't appear to be thread safe in trunk...or user error?

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