Please enable app-eselect/eselect-java for dev-java/openjdk{,-bin}
I have same issue on 4.18.18-gentoo-r1 kreyren@dreamon ~ $ eselect java-vm list Available Java Virtual Machines: [1] icedtea-bin-8 system-vm Relevant: https://github.com/PhoenicisOrg/phoenicis/issues/1694#issuecomment-450953830
Relavant: Solved the issue by invoking `export JAVA_HOME="/usr/lib64/openjdk-11"`.
eselect supports openjdk11 if you build it with "gentoo-vm" useflag. feel free to use-unmask on your system as you see fit. unfortunately it's not ready to be unmasked globally. you can read about unmasking use flags for packages here: https://wiki.gentoo.org/wiki//etc/portage/profile/package.use.mask
*** Bug 672328 has been marked as a duplicate of this bug. ***