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[1.16.3] Add custom generation


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Hello, I'm having troubles with adding custom generation on 1.16.3. I used solution from this post https://forums.minecraftforge.net/topic/90560-1162-how-to-add-custom-ore-to-world-generation/ and it's working for ores but i also want to add new tree and Im getting cast error

RubberTreeBlockStateProvider cannot be cast to net.minecraft.world.gen.blockstateprovider.SimpleBlockStateProvider

 Code I use:

    public static void initGen() {
                        .withConfiguration(new OreFeatureConfig(OreFeatureConfig.FillerBlockType.field_241882_a /* base_stone_overworld */, ModBlocks.COPPER_ORE.getDefaultState(), ModConfig.worldgen_copper_size))
                        .withPlacement(Placement.field_242907_l/* RANGE */.configure(new TopSolidRangeConfig(ModConfig.worldgen_copper_min_height, 0, ModConfig.worldgen_copper_max_height)))
                        .func_242728_a() /* spreadHorizontally */
                        .func_242731_b(ModConfig.worldgen_copper_size) /* repeat */

                WorldGenRegistries.CONFIGURED_FEATURE /* Feature Registering */,
                ModBlocks.RUBBER_SAPLING.getRegistryName() /* Resource Location */,
                Feature.TREE /* no_surface_ore */.withConfiguration(RUBBER_TREE_CONFIG)
                        .withPlacement(Placement.field_242902_f/* RANGE */.configure(new AtSurfaceWithExtraConfig(12, 12, 72)))


    public static void setupGen() {
        for (Map.Entry<RegistryKey<Biome>, Biome> biome : WorldGenRegistries.BIOME.getEntries() /* Collection of Biome Entries */) {
            if (!biome.getValue().getCategory().equals(Biome.Category.NETHER) && !biome.getValue().getCategory().equals(Biome.Category.THEEND)) {



    public static void addFeatureToBiome(Biome biome, GenerationStage.Decoration decoration, ConfiguredFeature<?, ?> configuredFeature) {
        List<List<Supplier<ConfiguredFeature<?, ?>>>> biomeFeatures = new ArrayList<>(
                biome.getGenerationSettings().getFeatures()/* List of Configured Features */

        while (biomeFeatures.size() <= decoration.ordinal()) {

        List<Supplier<ConfiguredFeature<?, ?>>> features = new ArrayList<>(biomeFeatures.get(decoration.ordinal()));
        features.add(() -> configuredFeature);
        biomeFeatures.set(decoration.ordinal(), features);

        ObfuscationReflectionHelper.setPrivateValue(BiomeGenerationSettings.class, biome.getGenerationSettings(), biomeFeatures, "features");


Rubber tree:

public class RubberTree extends Tree {

    public static final BaseTreeFeatureConfig RUBBER_TREE_CONFIG = (
            new BaseTreeFeatureConfig.Builder(
                    new RubberTreeBlockStateProvider(ModBlocks.RUBBER_LOG.getDefaultState()),
                    new SimpleBlockStateProvider(ModBlocks.RUBBER_LEAVES.getDefaultState()),
                    new RubberFoliagePlacer(2, 0),
                    new StraightTrunkPlacer(4, 2, 0),
                    new TwoLayerFeature(1, 0, 1))

    protected ConfiguredFeature<BaseTreeFeatureConfig, ?> getTreeFeature(Random randomIn, boolean p_225546_2_) {
        return Feature.TREE.withConfiguration(RUBBER_TREE_CONFIG);


Is there a simple solution to fix this? I can add that tree is working correctly in game, Im only having troubles to add it to generation.

Edited by Maciej916
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1 minute ago, Maciej916 said:

RubberTreeBlockStateProvider cannot be cast to net.minecraft.world.gen.blockstateprovider.SimpleBlockStateProvider

I think that statement should be self explanatory if you understand java well enough.


Also, 1.16.3 has a new way of registering features for biomes via BiomeLoadingEvent. Use that instead over this outdated makeshift answer which would result in a lot of concurrency issues.

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