There is no installed JRE for Java 11, it is expected that distributed apps have their own JRE included. This is done using jMods and building a package. Luckily for us, Erel has provided the
B4jPackager which means that we don't have to worry about it, unless you have a specific need to not distribute an .exe file.
I only looked at it briefly, but I think if you built it yourself the end result would be an executable script that contains the app and enough of the 'JRE' to run it.