Important
Priority is currently Minestom. This project has only a very limited list of features, consider alternatives or implementing your own.
See Minestom Project on GitHub
git clone --recurse-submodules https://github.com/Minestom/VanillaReimplementation
You can use this repo by finding the latest release here. After selecting your release, make sure to choose which modules (vanila features) you want. The "core" module is required. Everything else is optional and up to you.
Once you have added your modules to your classpath, you can initiate vri in your server's startup using this snippet:
VanillaReimplementation vri = VanillaReimplementation.hook(MinecraftServer.process());.
See here for an example.
See the github project for a list of relevant tasks that need to be done.