Something in recent weeks' (or longer?) upgrades from Ubuntu broke the Perspective Designer for me on my daily driver. Switching to the system JVM makes it all work for me, across all versions I poked at:
$ java --version
openjdk 11.0.19 2023-04-18
OpenJDK Runtime Environment (build 11.0.19+7-post-Ubuntu-0ubuntu120.04.1)
OpenJDK 64-Bit Server VM (build 11.0.19+7-post-Ubuntu-0ubuntu120.04.1, mixed mode, sharing)
Interestingly, the embedded JRE 11.0.11 appears to still work (launching from a v8.1.7 instance).
Embedded launchers from v8.13, v8.1.17, v8.1.24, and v8.1.28 fail to open views. (Chromium sitting idle, too--not burning CPU like some older bugs.)
While stuck, nothing interesting shows up on the designer's text console, nor when running the designer process from a terminal.
It isn't hurting me to run the system java, but I though y'all should know.
{JxBrowser tests against Ubuntu 20.04, which is what prompted me to try the system java.}