The file ..../bug_trackers/libvips/libvips-LINK-459-0.pdf
is empty and has a date of March 9, 2021 (a few other files there are also empty). But it wasn't empty when I ran the "A" session of tika-eval for pdfbox, see
..../extracts/pdfboxA/bug_trackers/libvips/libvips-LINK-459-0.pdf.json
which starts with
[{"Author":"R. Smith, MicroImages, Inc.","Content-Length":"161619",
Tilman
