I've setup a very simple mod for Forge 1.16.3 where I'm trying to implement the new mobs shown into the Mob Vote. But when I try to summon an entity I get this error
 

[23:22:02] [Server thread/WARN] [minecraft/EntityType]: Exception loading entity: 
java.lang.NullPointerException: null
    at net.minecraft.entity.ai.attributes.AttributeModifierManager.func_233795_c_(AttributeModifierManager.java:67) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at net.minecraft.entity.LivingEntity.func_233637_b_(LivingEntity.java:1849) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at net.minecraft.entity.LivingEntity.getMaxHealth(LivingEntity.java:1610) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at net.minecraft.entity.LivingEntity.<init>(LivingEntity.java:209) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at net.minecraft.entity.MobEntity.<init>(MobEntity.java:108) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.entity.CreatureEntity.<init>(CreatureEntity.java:13) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at net.minecraft.entity.AgeableEntity.<init>(AgeableEntity.java:21) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at net.minecraft.entity.passive.AnimalEntity.<init>(AnimalEntity.java:37) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at net.minecraft.entity.passive.CowEntity.<init>(CowEntity.java:35) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at com.mobvote.entity.MoobloomEntity.<init>(MoobloomEntity.java:19) ~[main/:?] {re:classloading}
    at net.minecraft.entity.EntityType.create(EntityType.java:448) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at net.minecraft.entity.EntityType.lambda$loadEntityUnchecked$1(EntityType.java:459) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at java.util.Optional.map(Optional.java:215) ~[?:1.8.0_221] {}
    at net.minecraft.entity.EntityType.loadEntityUnchecked(EntityType.java:458) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at net.minecraft.entity.EntityType.loadEntity(EntityType.java:516) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at net.minecraft.entity.EntityType.func_220335_a(EntityType.java:498) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at net.minecraft.command.impl.SummonCommand.summonEntity(SummonCommand.java:50) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at net.minecraft.command.impl.SummonCommand.lambda$register$1(SummonCommand.java:34) ~[forge-1.16.3-34.1.0_mapped_snapshot_20200514-1.16-recomp.jar:?] {re:classloading}
    at com.mojang.brigadier.CommandDispatcher.execute(CommandDispatcher.java:262) ~[brigadier-1.0.17.jar:?] {re:classloading}
    at net.minecraft.command.Commands.handleCommand(Commands.java:222) ~[?:?] {re:classloading}
    at net.minecraft.network.play.ServerPlayNetHandler.handleSlashCommand(ServerPlayNetHandler.java:1079) ~[?:?] {re:classloading}
    at net.minecraft.network.play.ServerPlayNetHandler.processChatMessage(ServerPlayNetHandler.java:1059) ~[?:?] {re:classloading}
    at net.minecraft.network.play.client.CChatMessagePacket.processPacket(CChatMessagePacket.java:40) ~[?:?] {re:classloading}
    at net.minecraft.network.play.client.CChatMessagePacket.processPacket(CChatMessagePacket.java:8) ~[?:?] {re:classloading}
    at net.minecraft.network.PacketThreadUtil.lambda$checkThreadAndEnqueue$0(PacketThreadUtil.java:19) ~[?:?] {re:classloading}
    at net.minecraft.util.concurrent.TickDelayedTask.run(TickDelayedTask.java:20) ~[?:?] {re:classloading}
    at net.minecraft.util.concurrent.ThreadTaskExecutor.run(ThreadTaskExecutor.java:139) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.util.concurrent.RecursiveEventLoop.run(RecursiveEventLoop.java:22) ~[?:?] {re:classloading}
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:754) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:156) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.util.concurrent.ThreadTaskExecutor.driveOne(ThreadTaskExecutor.java:109) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.driveOneInternal(MinecraftServer.java:737) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.driveOne(MinecraftServer.java:731) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.util.concurrent.ThreadTaskExecutor.drainTasks(ThreadTaskExecutor.java:97) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.runScheduledTasks(MinecraftServer.java:716) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:663) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at net.minecraft.server.MinecraftServer.lambda$func_240784_a_$0(MinecraftServer.java:230) ~[?:?] {re:classloading,pl:accesstransformer:B}
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_221] {}

The entity is just an extension to the Cow, and it's class is this
 

/**
 * Moobloom Entity
 */
public class MoobloomEntity extends CowEntity {

    /**
     * Constructor. Set the Entity Type and the World
     *
     * @param type Entity Type
     * @param worldIn World
     */
    public MoobloomEntity(EntityType<? extends CowEntity> type, World worldIn) {
        super(type, worldIn);
    }
}

Which is registerd like this
 

/**
     * Entity Registry
     */
    public static final DeferredRegister<EntityType<?>> ENTITY_REGISTRY = DeferredRegister.create(ForgeRegistries.ENTITIES, MobVote.MOD_ID);

public static final RegistryObject<EntityType<MoobloomEntity>> MOOBLOOM_ENTITY = ENTITY_REGISTRY.register("moobloom",
            () -> EntityType.Builder.create(MoobloomEntity::new, EntityClassification.CREATURE)
                            .size(0.9f, 1.4f)
                            .build(new ResourceLocation(MobVote.MOD_ID, "moobloom").toString()));

The register method for the Entity Registry is called from the mod constructor
 

public MobVote() {
        final IEventBus modEventBus = FMLJavaModLoadingContext.get().getModEventBus();

        MobVoteEntities.ENTITY_REGISTRY.register(modEventBus);
        MinecraftForge.EVENT_BUS.register(this);
    }

 

I used to do this in 1.15.2, has something changed in 1.16 or am I missing something?

Edited September 28, 20205 yr by JimiIT92
solved

I think you will need to register some essential attributes like health.. etc.

 

 

So that's mandatory now... Ok, registering attributes using the enqueWork method works. Thank you for the help