"entrypoints": "main": [ "adapter": "kotlin", "value": "com.yourname.awesome.mod.ExampleModKt" ] , "depends": "fabric-language-kotlin": ">=1.10.0"
In this post, we’ll explore why Kotlin is gaining traction in the Fabric community, how to set it up, and which features will make you never want to touch Java for modding again. Fabric is lightweight, modular, and fast. Kotlin complements this perfectly. Here is what you gain:
launch delay(5000) // This runs on the main server thread after 5 seconds player.sendMessage(Text.literal("5 seconds have passed!"))
player?.world?.setBlockState(pos, state) // Safe call chain If player or world is null, nothing happens. No crash. Add a helper to check if a block is exposed to sky:
fun BlockView.isSkyExposed(pos: BlockPos): Boolean return getLightLevel(pos) >= 15 && !isRainOccluded(pos)
| Feature | Benefit for Modders | | :--- | :--- | | | Forget @Nullable annotations. The compiler enforces null safety, eliminating NullPointerException crashes. | | Data Classes | One line of code for ItemStack , BlockPos , or custom component holders. | | Extension Functions | Add methods to PlayerEntity or World without inheritance or wrappers. | | Coroutines | Write asynchronous tasks (e.g., HTTP requests, delayed actions) without callback hell. | | Immutability | val over var encourages thread-safe, predictable code. | Setting Up a Kotlin Fabric Project Fabric does not natively support Kotlin, but the community maintains Fabric Language Kotlin (FabricLKotlin) . Think of it as the Kotlin runtime for Fabric. Step 1: Use the Template The easiest way is to use the official template: