NPE

gradle.properties

@@ -9,7 +9,7 @@ org.gradle.jvmargs=-Xmx1G
 	# check available versions on maven for the given minecraft version you are using
 
 # Mod Properties
-	mod_version = 1.0.0
+	mod_version = 1.0.1
 	maven_group = chunk-debug
 	archives_base_name = chunk-debug
 

src/main/java/chunkdebug/mixins/MinecraftServerMixin.java

@@ -2,20 +2,15 @@
 
 import chunkdebug.ChunkDebugServer;
 import net.minecraft.server.MinecraftServer;
-import net.minecraft.server.world.ServerWorld;
 import org.spongepowered.asm.mixin.Mixin;
-import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
 import java.util.function.BooleanSupplier;
 
 @Mixin(MinecraftServer.class)
-public abstract class MinecraftServerMixin {
-	@Shadow
-	public abstract Iterable<ServerWorld> getWorlds();
-
+public class MinecraftServerMixin {
 	@Inject(method = "tick", at = @At("HEAD"))
 	private void onTick(BooleanSupplier shouldKeepTicking, CallbackInfo ci) {
 		ChunkDebugServer.chunkNetHandler.tickUpdate();
@@ -25,9 +20,4 @@ private void onTick(BooleanSupplier shouldKeepTicking, CallbackInfo ci) {
 	private void onLoadWorldPre(CallbackInfo ci) {
 		ChunkDebugServer.server = (MinecraftServer) (Object) this;
 	}
-
-	@Inject(method = "loadWorld", at = @At(value = "INVOKE", target = "Lnet/minecraft/server/MinecraftServer;createWorlds(Lnet/minecraft/server/WorldGenerationProgressListener;)V", shift = At.Shift.AFTER))
-	private void onLoadWorldPost(CallbackInfo ci) {
-		this.getWorlds().forEach(ChunkDebugServer.chunkNetHandler::addWorld);
-	}
 }

src/main/java/chunkdebug/mixins/ServerWorldMixin.java

@@ -0,0 +1,26 @@
+package chunkdebug.mixins;
+
+import chunkdebug.ChunkDebugServer;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.WorldGenerationProgressListener;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.util.registry.RegistryKey;
+import net.minecraft.world.dimension.DimensionType;
+import net.minecraft.world.gen.chunk.ChunkGenerator;
+import net.minecraft.world.level.ServerWorldProperties;
+import net.minecraft.world.level.storage.LevelStorage;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.List;
+import java.util.concurrent.Executor;
+
+@Mixin(ServerWorld.class)
+public class ServerWorldMixin {
+	@Inject(method = "<init>", at = @At(value = "INVOKE", target = "Lnet/minecraft/server/world/ServerTickScheduler;<init>(Lnet/minecraft/server/world/ServerWorld;Ljava/util/function/Predicate;Ljava/util/function/Function;Ljava/util/function/Consumer;)V"))
+	private void onCreateServerWorld(MinecraftServer server, Executor workerExecutor, LevelStorage.Session session, ServerWorldProperties properties, RegistryKey<?> worldKey, DimensionType dimensionType, WorldGenerationProgressListener worldGenerationProgressListener, ChunkGenerator chunkGenerator, boolean debugWorld, long seed, List<?> spawners, boolean shouldTickTime, CallbackInfo ci) {
+		ChunkDebugServer.chunkNetHandler.addWorld((ServerWorld) (Object) this);
+	}
+}

src/main/resources/chunkdebug.mixins.json

@@ -9,6 +9,7 @@
     "MinecraftServerMixin",
     "PlayerManagerMixin",
     "ServerPlayNetworkHandlerMixin",
+    "ServerWorldMixin",
     "ThreadedAnvilChunkStorageAccessor"
   ],
   "injectors": {

src/main/resources/fabric.mod.json

@@ -1,7 +1,7 @@
 {
   "schemaVersion": 1,
   "id": "chunkdebug",
-  "version": "1.0.0",
+  "version": "1.0.1",
 
   "name": "Chunk Debug",
   "description": "Chunk Debug server side support",