Regarding the scaling issues, this worked for me on Windows 10 + Java 8:
1. Find the Java web start executable:
Right click on ISY Launcher shortcut
More > Open file location
In the explorer window right click on ISY Launcher
Open file location
javaws.exe in your JRE should be selected
2. Change DPI scaling behavior from Application to System:
Right click on javaws.exe
Properties > Compatibility > Change high DPI settings
Check "Override high DPI scaling behavior. Scaling performed by:"
Select "System"
As far as I know, Java 9 should scale correctly without scaling performed by system.