Code repository: Here

 

I registered my custom feature in FeatureRegistry.java and McbbsWiki.java.

 

FeatureRegistry.java:

public static final DeferredRegister<Feature<?>> FEATURES = DeferredRegister.create(ForgeRegistries.FEATURES, "mcbbswiki");
public static RegistryObject<McbbsWikiLuckyBlockFeature> feature_lucky_block = FEATURES.register("feature_lucky_block", () -> new McbbsWikiLuckyBlockFeature(NoFeatureConfig.field_236558_a_));

 

McbbsWiki.java (the main class of this mod):

FeatureRegistry.FEATURES.register(
	FMLJavaModLoadingContext.get().getModEventBus()
);

 

But, when I used

FeatureRegistry.feature_lucky_block.get()

to get the object (in world.biome.McbbsWikiBiomeMaker.java:37), the game throwed a NullPointerException and crashed.

 

I found out "FeatureRegistry.feature_lucky_block.isPresent()" returned false and "FeatureRegistry.feature_lucky_block.value" is null, but do not know how to solve the problem.

 

The full logs are shown below.Please help me.

latest.log crash-2021-01-20_15.04.42-fml.txt

48 minutes ago, diesieben07 said:

Show this class: McbbsWikiBiomeMaker.makeMcbbsWikiNormalBiome

Attention:This is a method, not a class.

public static Biome makeMcbbsWikiNormalBiome(){
        MobSpawnInfo.Builder mobSpawnInfo = new MobSpawnInfo.Builder();
        mobSpawnInfo.isValidSpawnBiomeForPlayer();
        DefaultBiomeFeatures.withPassiveMobs(mobSpawnInfo);
        mobSpawnInfo.withSpawner(EntityClassification.CREATURE, new MobSpawnInfo.Spawners(EntityRegistry.entity_small_mcbbswiki_monster.get(), 10, 5, 7));
        mobSpawnInfo.withSpawner(EntityClassification.CREATURE, new MobSpawnInfo.Spawners(EntityRegistry.entity_middle_mcbbswiki_monster.get(), 7, 3, 5));
        mobSpawnInfo.withSpawner(EntityClassification.CREATURE, new MobSpawnInfo.Spawners(EntityRegistry.entity_large_mcbbswiki_monster.get(), 4, 1, 3));
        mobSpawnInfo.withSpawner(EntityClassification.CREATURE, new MobSpawnInfo.Spawners(EntityType.LLAMA, 5, 4, 6));
        BiomeGenerationSettings.Builder biomeGeneSettings = (new BiomeGenerationSettings.Builder()).withSurfaceBuilder(ConfiguredSurfaceBuilders.field_244181_m);

        DefaultBiomeFeatures.withStrongholdAndMineshaft(biomeGeneSettings);
        biomeGeneSettings.withStructure(StructureFeatures.RUINED_PORTAL);
        biomeGeneSettings.withFeature(GenerationStage.Decoration.VEGETAL_DECORATION, FeatureRegistry.feature_lucky_block.get().withConfiguration(IFeatureConfig.NO_FEATURE_CONFIG));
        DefaultBiomeFeatures.withCavesAndCanyons(biomeGeneSettings);
        DefaultBiomeFeatures.withLavaAndWaterLakes(biomeGeneSettings);
        DefaultBiomeFeatures.withMonsterRoom(biomeGeneSettings);
        DefaultBiomeFeatures.withCommonOverworldBlocks(biomeGeneSettings);
        DefaultBiomeFeatures.withOverworldOres(biomeGeneSettings);
        DefaultBiomeFeatures.withDisks(biomeGeneSettings);
        DefaultBiomeFeatures.withMountainTrees(biomeGeneSettings);
        DefaultBiomeFeatures.withDefaultFlowers(biomeGeneSettings);
        DefaultBiomeFeatures.withBadlandsGrass(biomeGeneSettings);
        DefaultBiomeFeatures.withNormalMushroomGeneration(biomeGeneSettings);
        DefaultBiomeFeatures.withSugarCaneAndPumpkins(biomeGeneSettings);
        DefaultBiomeFeatures.withLavaAndWaterSprings(biomeGeneSettings);
        DefaultBiomeFeatures.withEmeraldOre(biomeGeneSettings);
        DefaultBiomeFeatures.withInfestedStone(biomeGeneSettings);
        DefaultBiomeFeatures.withFrozenTopLayer(biomeGeneSettings);
        return (new Biome.Builder())
                .precipitation(Biome.RainType.RAIN)
                .category(Biome.Category.EXTREME_HILLS)
                .depth(-0.5F)
                .scale(1.3F)
                .temperature(0.7F)
                .downfall(0.3F)
                .setEffects((new BiomeAmbience.Builder())
                        .setWaterColor(0x3f76e4)
                        .setWaterFogColor(0x050533)
                        .setFogColor(0xc0d8ff)
                        .withSkyColor(getSkyColorWithTemperatureModifier(0.7F))
                        .setMoodSound(MoodSoundAmbience.DEFAULT_CAVE).build())
                .withMobSpawnSettings(mobSpawnInfo.copy())
                .withGenerationSettings(biomeGeneSettings.build())
                .build();
    }

See https://github.com/QWERTY770/MCBBS-Wiki-Mod/tree/main/src/main/java/cn/mcbbswiki/qwerty5238/world

23 minutes ago, diesieben07 said:

You cannot access registry entries directly before FMLCommonSetupEvent. Here you are trying to access the features during the biome registry phase, which will not work.

So, how can I do that?

2 minutes ago, diesieben07 said:

Do what?

Generate feature mcbbswiki:feature_lucky_block in Mcbbs Wiki Normal Biome