Setting Java release version for UML->Java forward engineering

Tried to forward engineer some Java UML but VP didn’t like my (plainly legal) use of generics, I am supposing because the default version of Java used by VP (somewhere) pre-dates Java’s generics release.

How do I tell VP to use the latest (20) version of Java ? If it can’t do that how do I know what it can do and how do I set it?