Yes & no... A JDK is necessary, and once you'll have a native JDK, you
don't need linux-base any more, but linux-base was required to
bootstrap your native JDK!
I suppose that you could build a native JDK on another machine with
linux-base, make a package, transfert and then install it on this machine.
I've not tried, but it should work. Just type:
Note to Lute: please don't top-post, and fold your lines!