Crossplay

Crossplay

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Goal: Java clients from 1.8 to 26.3 and Bedrock clients play on the same servers.

How players get in

Client	Path
Java, latest version	Velocity → backend directly
Java, other versions	ViaVersion translates newer clients; ViaBackwards and ViaRewind cover older clients down to 1.8
Bedrock	Geyser translates the protocol, Floodgate authenticates Bedrock players without a Java account

All of this runs on the proxy. Backends run the newest Minecraft version and do not need to know which client a player uses.

Current state

• The proxy runs Velocity, Geyser, Floodgate, ViaVersion 5.12.2, ViaBackwards 5.12.2 and ViaRewind 4.2.0. ViaBackwards and ViaRewind translate for older Java clients down to 1.8 (#5).
• Floodgate runs on every backend, the Fabric mod server included (Floodgate-Fabric 2.2.7-b69, #4). All servers share one Floodgate key.
• Geyser accepts both Bedrock transports (transport: both): RakNet on UDP 19132, NetherNet with built-in signaling on TCP 19132 and its WebRTC traffic on UDP 19133 (always bedrock-port + 1). Forward all three when the network is reachable from outside.

Rules for game content

• Every game mode has to be playable on Bedrock. A mode Bedrock players cannot enter will not ship.
• Menus are inventory menus, which Geyser shows on Bedrock too. Bedrock forms are not used, so both editions see the same menu.
• The mod server only uses server-side mods, because Bedrock clients cannot install Fabric mods.
• The planned anti-cheat (stage 6) treats Bedrock movement separately so Bedrock players do not get flagged for normal behaviour.
• The planned resource pack (stage 7) comes as a Java pack for every pack_format from 1.8 to 26.3 and as a Bedrock pack for Geyser.

Plugin versions (planned, stage 3)

The Vectolyn plugin covers Minecraft 1.8.8 to 26.3 through version adapters. For 1.8.8 server groups a modern fork that runs on Java 21 will be chosen in stage 2.