rctapi fix
Java mod listed for Minecraft 1.21. Downloads from the MC Java Mods app on Android.
⬇ Download on CurseForgeThe author built this one for Minecraft 1.21.1 on Fabric. On other versions it may install and then do nothing.
RCTAPI Academy Fix
This is a compatibility patch for the Radical Cobblemon Trainers API (rctapi) mod, designed specifically for modpacks using Abes Hutt's Cobblemon fork (branch academy-1.7.1).
What does this mod do?
Abes Hutt's Cobblemon fork modified the signature of BattleRegistry.startBattle() by adding an optional Function2 callback parameter. This change breaks compatibility with any mod that calls this method using the original signature, causing a server crash whenever a battle is initiated.
This fix patches BattleManager.startBattle() inside rctapi to call BattleRegistry.startBattle$default() instead, passing the appropriate Kotlin default parameter mask. This makes rctapi fully compatible with the modified Cobblemon fork without altering any gameplay behavior.
Who needs this?
Any modpack that includes:
- Abes Hutt's Cobblemon fork (academy-1.7.1)
- rctapi 0.15.0-beta
- Any mod that depends on rctapi, such as Cobblemon Battle Tower or Rad Gyms
What is affected?
- Cobblemon Battle Tower battles will no longer crash the server
- Rad Gyms battles will no longer crash the server
- All other rctapi functionality remains unchanged
This mod is a fork of rctapi 0.15.0-beta by hd42, modified under the GNU LGPL-3.0 license.
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.1
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on CurseForge — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
- Ships as rctapi-fabric-1.21.1-0.15.0-beta-academyfix.jar — drop this file into the mods folder
- Download size: 226 KB
- Download link checked 3 Oct 2026 — working
These come from our own check of the pack file, not from the source page.