I would agree that Java, of all those I listed, is likely to be better supported. I do wonder if a Java version from 10 years ago would still be officially supp

I would agree that Java, of all those I listed, is likely to be better supported. I do wonder if a Java version from 10 years ago would still be officially supported (or recommended) - and encouraged to use the later Java release... meaning (likely) code changes. This is not entirely the case for C. I guess.. it depends. If I use gcc (std=c99) for a project I wrote today... this will likely work in 10 years time, with the latest gcc version... without changes.