@bjonnh A JDK11 compatible version of TornadoFX is in the works, but being stuck on Java 8 for the time being really doesn't matter much, since we're writing Kotlin code, which is light years ahead of Java 11 anyway. Upgrading to Java 11 for a TornadoFX app won't make much of a difference, but of course we'll support it when conversion issues have been ironed out.