Hi, I'm not sure what was wrong with Hudson. It was completely stuck with dozens of builds waiting in the queue so I restarted it earlier today.
The build queue is now empty, but while doing all the pending PDFBox builds it apparently hit some random Hudson bugs that triggered these warning messages. All the PDFBox builds seem to have completed successfully ("BUILD SUCCESSFUL"), but for some reason Hudson marked some of the builds as failing which caused these messages sent to pdfbox-...@. I'll keep an eye on the Hudson builds, but for now it seems to be back to normal. BR, Jukka Zitting