Ubuntu – Installing javaws on Ubuntu 18.04

My jvm installation apparently does not contain javaws.

sudo update-alternatives --get-selections | grep ^java
java manual /usr/lib/jvm/java-12-oracle/bin/java
javac manual /usr/lib/jvm/java-12-oracle/bin/javac
javadoc manual /usr/lib/jvm/java-12-oracle/bin/javadoc
javap manual /usr/lib/jvm/java-12-oracle/bin/javap

I have used both the ppa and a direct install from oracle here:
https://www.oracle.com/technetwork/java/javase/downloads/jdk12-downloads-5295953.html

and
https://linuxconfig.org/how-to-install-java-on-ubuntu-18-04-bionic-beaver-linux

I need javaws to launch a jnlp file.

Any ideas?

Thanks in advance.

(NOTE: I tried v11 and v8 ppa appears unavailable due to new licensing.)