Aryan Ganjoo created PDFBOX-6286:
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Summary: PDPageTree.get reports false recursion after an
out-of-range lookup
Key: PDFBOX-6286
URL: https://issues.apache.org/jira/browse/PDFBOX-6286
Project: PDFBox
Issue Type: Bug
Reporter: Aryan Ganjoo
h3. Observed
On current PDFBox trunk {{e314c402afd4cac4d60d6d16dbe6525d83637ba8}}, an
out-of-range {{PDPageTree.get(1)}} on a one-page document throws as expected,
but a subsequent valid {{get(0)}} on the *same* tree throws
{{IllegalStateException: Possible recursion found when searching for page 1}}.
The document is generated in memory and contains no page-tree cycle.
h3. Minimal reproduction
{code:java}
try (PDDocument document = new PDDocument()) {
PDPage page = new PDPage();
document.addPage(page);
PDPageTree pages = document.getPages();
try { pages.get(1); } catch (IndexOutOfBoundsException expected) { }
pages.get(0); // unexpectedly reports recursion
}
{code}
h3. Cause and expected behavior
The lookup keeps visited page dictionaries in an instance field. The failed
lookup adds the root and exits without clearing that field, so the next lookup
sees stale state. A fresh lookup should be able to retrieve page zero; cycle
detection should remain scoped to one traversal. This is separate from
PDFBOX-3349 (the out-of-range request itself) and PDFBOX-5278 (an
annotation/type mutation on a particular PDF).
h3. Local validation and limits
A regression failed on unmodified trunk and passed with a local candidate that
uses a per-lookup visited set. The affected {{TestPDPageTree}} class passed 8
tests, zero failures/errors. The full suite, stable branches, nested-cycle
cases, and downstream use were not tested. No private PDF or application data
was used. This is an issue report, not a submitted patch. AI assistance was
used for discovery, test and patch preparation, and local validation.
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