On a blackbox linux system neither the system or the openjdk had any fonts so this caused issue for my Java application.
So far to get round this I have copied the Lucida fonts from an Oracle Java install into the jre/lib/fonts
dir and ran fc-cache -rv jre/lib/fonts
and that has worked for me.
But it seems these standard fonts do not support CKJ scripts, what is a font I can copy to fonts that will add support for these scripts for my Java application.
Note I cannot run install or similar on the linux machine I need a font I can just bundle with my application that I can then copy to the jre/lib/fonts folder.