I am using Rocky 9 linux with Virtualmin/Webmin. Lucee is installed with the Lucee installer, which packages its own Tomcat.
I have noted this problem in this post: Websocket Extention 3.0.0.18 on Lucee 7 does not seem to work - #5 by MiniFireDragon
Which has a copy of the log. If you need more, I will reboot the webserver and get the websocket log again, but the error was the same.