NEM info is a bit outdated.
Now there is a new version on the way: Catapult, and is not developed in Java.
NEM has public chain and private chain too, so it is a complete solution for enterprises and Dapps.
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we wrote this a while ago. Thanks for pointing that out. If you have any links maybe we can make a follow up later.
This is the official page: https://nem.io/catapult/
thanks