This is not timestamped, but I guess it is the thing. Weird, I don't remember my provisioning does anything JRE-related, but I will do some digging myself.
Yay, I'm an idiot. I have automatic updates via yum-cron and OpenJDK had been updated. A reboot solved the issue.
I'm not sure if it's worth filing a bug about this, but I don't mind doing so.
Sorry for wasting everyone's time :(
Álex
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