I have 3 different WebObjects/Ubuntu 22.04 servers running, different applications, different clients, different locations (data centre and on-premises), different stages of software update, and they all failed today when they were working fine yesterday and nothing changed between yesterday and today.

Seemed to be IOExceptions, for example "java.io.IOException: IOException running print command : /usr/bin/lp" or IOException when trying to control instances in JavaMonitor

Rebooting fixed them all. Weird!

Tim