I tried to put this in a comment/reply, but kept getting an error message: "Your post couldn’t be saved. Please try again in a few minutes." Thanks – Fetching the Notary Log was exactly what I was looking for. I tried signing again, and it failed again, so I checked the notary log. It seems to be two apparently unsigned JNI libraries that the app depends on: libgluegen-rt and libjnidispatch. These aren’t new dependencies, so it must be related to the switch to Maven. Any idea how to request signed artifacts from Maven? A quick Google search didn’t help.