Oasis Biome data and Generation

BiomeEnhancements.java

   public BiomeEnhancements()
    {
        // Register blocks, Items, and Biome
        RegistryHandler.init();
     
        // Register ourselves for server and other game events we are interested in
        MinecraftForge.EVENT_BUS.register(this);
    }

    private void setup(final FMLCommonSetupEvent event)
    {
    	// Register Biome
    	WorldGeneration.registerBiome(RegistryHandler.OASIS_BIOME.get(), BiomeManager.BiomeType.DESERT, 1, Type.DRY, Type.OVERWORLD);
    }

OasisBiome.java

public class OasisBiome {

	// Create/build our biome
		public static Biome makeOasisBiome(float depth, float scale) {
		      MobSpawnInfo.Builder mobspawninfo$builder = new MobSpawnInfo.Builder();
		      withOasisMobs(mobspawninfo$builder);
		      BiomeGenerationSettings.Builder biomegenerationsettings$builder = (new BiomeGenerationSettings.Builder()).withSurfaceBuilder(ConfiguredSurfaceBuilders.field_244178_j);
		      
		      DefaultBiomeFeatures.withStrongholdAndMineshaft(biomegenerationsettings$builder);
		      DefaultBiomeFeatures.withCavesAndCanyons(biomegenerationsettings$builder);
		      DefaultBiomeFeatures.withCommonOverworldBlocks(biomegenerationsettings$builder);
		      DefaultBiomeFeatures.withOverworldOres(biomegenerationsettings$builder);
		      DefaultBiomeFeatures.withDisks(biomegenerationsettings$builder);
		      withOasisVegetation(biomegenerationsettings$builder);
		      DefaultBiomeFeatures.withBadlandsGrass(biomegenerationsettings$builder);
		      DefaultBiomeFeatures.withDesertVegetation(biomegenerationsettings$builder);
		      DefaultBiomeFeatures.withLavaAndWaterSprings(biomegenerationsettings$builder);
		      DefaultBiomeFeatures.withDesertWells(biomegenerationsettings$builder);
		      return (new Biome.Builder()).precipitation(Biome.RainType.NONE).category(Biome.Category.DESERT).depth(depth).scale(scale).temperature(0.95F).downfall(0.9F).setEffects((new BiomeAmbience.Builder()).setWaterColor(4566514).setWaterFogColor(267827).setFogColor(12638463).withSkyColor(getSkyColorWithTemperatureModifier(2.0F)).setMoodSound(MoodSoundAmbience.DEFAULT_CAVE).build()).withMobSpawnSettings(mobspawninfo$builder.copy()).withGenerationSettings(biomegenerationsettings$builder.build()).build();
		   }
		
		// Mobs that spawn in the Oasis
		public static void withOasisMobs(MobSpawnInfo.Builder builder) {
		      builder.withSpawner(EntityClassification.CREATURE, new MobSpawnInfo.Spawners(EntityType.RABBIT, 4, 2, 3));
		      DefaultBiomeFeatures.withBats(builder);
		      builder.withSpawner(EntityClassification.CREATURE, new MobSpawnInfo.Spawners(EntityType.CHICKEN, 10, 4, 4));
		      builder.withSpawner(EntityClassification.MONSTER, new MobSpawnInfo.Spawners(EntityType.SPIDER, 100, 4, 4));
		      builder.withSpawner(EntityClassification.MONSTER, new MobSpawnInfo.Spawners(EntityType.ZOMBIE, 20, 4, 4));
		      builder.withSpawner(EntityClassification.MONSTER, new MobSpawnInfo.Spawners(EntityType.ZOMBIE_VILLAGER, 2, 1, 1));
		      builder.withSpawner(EntityClassification.MONSTER, new MobSpawnInfo.Spawners(EntityType.SKELETON, 20, 4, 4));
		   }
		
		// Generate our vegetation
		public static void withOasisVegetation(BiomeGenerationSettings.Builder builder) {
		      builder.withFeature(GenerationStage.Decoration.VEGETAL_DECORATION, WorldFeatures.DESERT_CANDLE);
		      DefaultBiomeFeatures.withWarmFlowers(builder);
		      DefaultBiomeFeatures.withBadlandsGrass(builder);
		      DefaultBiomeFeatures.withSugarCaneAndPumpkins(builder);
		      builder.withFeature(GenerationStage.Decoration.VEGETAL_DECORATION, Features.PATCH_MELON);
		      builder.withFeature(GenerationStage.Decoration.VEGETAL_DECORATION, WorldFeatures.PALM_TREE);

		   }
		
		private static int getSkyColorWithTemperatureModifier(float temperature) {
		      float lvt_1_1_ = temperature / 3.0F;
		      lvt_1_1_ = MathHelper.clamp(lvt_1_1_, -1.0F, 1.0F);
		      return MathHelper.hsvToRGB(0.62222224F - lvt_1_1_ * 0.05F, 0.5F + lvt_1_1_ * 0.1F, 1.0F);
		   }

}

OasisFeature.java

	// Edit chunk biomeIds and BiomeContainer
	private void EditBiome(IWorld worldIn, BlockPos pos)
	{
		 for(int x = -2; x <= 2; x++)
		 {
			 for(int y = -2; y <= 2; y++)
			 {
				 BlockPos blockpos = pos.add(x, 0, y);
				// We want to change the chunk's biome to our custom oasis biome for that nice water/foliage color
				try {
					// Get  the class we want access to
					@SuppressWarnings("rawtypes")
					Class BiomeContainerClass = BiomeContainer.class;
					
					// Get the field we want access to
					 Field[] fields = BiomeContainerClass.getDeclaredFields();
					 
					 BiomeContainer BiomeContainerInstance = worldIn.getChunk(blockpos).getBiomes();
					 Field field = null;
					 for(int i = 0; i < fields.length; i++)
					 {
						 if (fields[i].getName().equals("biomes"))
						 {
							 field = fields[i];
						 }
					 }
					 field.setAccessible(true);
					 
					 // Copy that field's data
					 Biome[] biomes = (Biome[]) field.get(BiomeContainerInstance);
					  
		
					 // Overwrite with our data
					 Biome biome = RegistryHandler.OASIS_BIOME.get();
					 int id = ((net.minecraftforge.registries.ForgeRegistry<Biome>)net.minecraftforge.registries.ForgeRegistries.BIOMES).getID(biome);
					 int place = (blockpos.getX() & 15) << 4 | (blockpos.getZ() & 15);
          // Successfully inserts our biome data and biome id
					 for(int i = -2; i <= 2; i++)
					 {
						 worldIn.getChunk(blockpos).getBiomes().getBiomeIds()[place + i] = id;
						 biomes[place + i] = biome;
					 }
						
					 // Edit the field's properties to replace it's data with our modified dataS
					 Field modifiersField = Field.class.getDeclaredField("modifiers");
					 modifiersField.setAccessible(true);
					 modifiersField.setInt(field, field.getModifiers() & (~Modifier.PRIVATE & ~Modifier.FINAL));
		
					 field.set(BiomeContainerInstance, biomes);
		
				} catch (Exception e) {
					System.out.println("failed to edit BiomeContainer or BiomeId");
				}
			 }
		 }
	}

RegistryHandler.java

public class RegistryHandler {

	public static final DeferredRegister<Biome> BIOMES = DeferredRegister.create(ForgeRegistries.BIOMES, BiomeEnhancements.MOD_ID);

	public static void init()
	{
		BIOMES.register(FMLJavaModLoadingContext.get().getModEventBus());
	}
  
  		//Biomes
		public static final RegistryObject<Biome> OASIS_BIOME = BIOMES.register("oasis",  () -> WorldGeneration.OASIS);

WorldGeneration.java

public class WorldGeneration {

	// Register our biome to exist
	public static final Biome OASIS = OasisBiome.makeOasisBiome(-0.1F, 0.0F);
	
	public static void registerBiome(Biome biome, BiomeType biomeType, int weight, BiomeDictionary.Type...types)
	{
		BiomeManager.addBiome(biomeType, new BiomeManager.BiomeEntry(key(biome), weight));
		BiomeDictionary.addTypes(key(biome), types);
	}
	
	private static RegistryKey<Biome> key(Biome biome)
	{
		return RegistryKey.getOrCreateKey(ForgeRegistries.Keys.BIOMES, Objects.requireNonNull(ForgeRegistries.BIOMES.getKey(biome), "Biome registry name was null"));
	}
}