I upgraded from Java 8 to OpenJava 17. There is no javaws.exe file in this version.
How do I get the console to startup? I don't want to have the old version installed.

 

The IoX Launcher supports Java 8. It may not support OpenJava (OpenJDK)

You can try clearing your java cache and downloading the IoX Launcher again

    https://isy.universal-devices.com/start.jnlp

The new versions do not have a control panel, so you can't clear the cache.
Other programs require newer versions of Java. 
So, my isy console is basically dead? ☹️

 

The version of java you're running is open source, so there could be security issues.

You might be able to install java 8 in a virtual machine, or you can use UD Mobile which doesn't require java.

You must have read my mind. I have a Win10 VM running on Proxmox where I installed jre 8 and that works.

Interesting, I found a program called IcedTea-Web 1.8.8.  It did not work with start.jnpl. Did not find Iox. However, with admin.jnpl, it worked and brought me to the login. So now I can use Win11 or my VM.