35
Days since last Rust Minecraft server
(dayssincelastrustmcserver.com)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
Rules
Nobody has even developed a fully open source Minecraft server in Java yet. There's never going to be one in Rust. The amount of work to keep up with changes or additions in content or the world simulation would just be too high.
There have been multiple Java based projects throughout the years. The most advanced one that is currently in development is https://github.com/Minestom/Minestom
Yeah world gen is one of the most difficult parts to implement since Minecraft and Mojang are very protective of that area, not to mention the monumental task of maintaining bug compatibility, especially with redstone. It's still interesting to see parts of Minecraft being implemented in other languages.