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https://issues.apache.org/jira/browse/PDFBOX-5681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17763759#comment-17763759
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Tim Allison commented on PDFBOX-5681:
-------------------------------------
When I run the demo code in PDFBox trunk with logging on, I see this in the log
before the new exception. Further, when running debug in the PDFBox project, I
can confirm that the xrefTable is somehow being modified during the iteration
of the objects.
{noformat}
11.09.2023 10:49:07 ERROR cos.COSObject:126 - Can't dereference COSObject{5, 0}
java.io.IOException: Wrong type of referenced length object COSObject{6, 0}:
COSDictionary
at org.apache.pdfbox.pdfparser.COSParser.getLength(COSParser.java:845)
~[classes/:?]
at
org.apache.pdfbox.pdfparser.COSParser.parseCOSStream(COSParser.java:875)
~[classes/:?]
at
org.apache.pdfbox.pdfparser.COSParser.parseFileObject(COSParser.java:710)
~[classes/:?]
at
org.apache.pdfbox.pdfparser.COSParser.parseObjectDynamically(COSParser.java:631)
~[classes/:?]
at
org.apache.pdfbox.pdfparser.COSParser.dereferenceCOSObject(COSParser.java:586)
~[classes/:?]
at org.apache.pdfbox.cos.COSObject.getObject(COSObject.java:121)
~[classes/:?]
at
org.apache.pdfbox.cos.COSDocument.getObjectsByType(COSDocument.java:257)
~[classes/:?]
at
org.apache.pdfbox.cos.COSDocument.getObjectsByType(COSDocument.java:240)
~[classes/:?]
at
org.apache.pdfbox.TestConcurrentModification.oneOff(TestConcurrentModification.java:18)
~[test-classes/:?]
...
{noformat}
> ConcurrentModificationException in getObjectsByType() in 3.x
> ------------------------------------------------------------
>
> Key: PDFBOX-5681
> URL: https://issues.apache.org/jira/browse/PDFBOX-5681
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 3.0.0 PDFBox
> Reporter: Tim Allison
> Priority: Minor
> Attachments: PDFBOX-3714-2.pdf
>
>
> [~tilman]'s regression testing turned up this exception when we integrate
> PDFBox 3.0.0 into Tika:
> {noformat}
> java.util.ConcurrentModificationException
> at java.base/java.util.HashMap$HashIterator.nextNode(HashMap.java:1597)
> at java.base/java.util.HashMap$KeyIterator.next(HashMap.java:1620)
> at
> org.apache.pdfbox.cos.COSDocument.getObjectsByType(COSDocument.java:254)
> at
> org.apache.pdfbox.cos.COSDocument.getObjectsByType(COSDocument.java:240)
> {noformat}
> I can replicate this exception consistently on the attached file.
> With this code:
> {noformat}
> Path path = Paths.get("/.../PDFBOX-3714-2.pdf");
> PDDocument document = Loader.loadPDF(path.toFile());
> List<COSObject> objs =
> document.getDocument().getObjectsByType(COSName.FILESPEC);
> {noformat}
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