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1.16.x Entity Attributes not being registered

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Hi, I am trying to add a custom entity, however whenever I try to summon the entity I keep receiving the following error.

[10:19:35] [Server thread/WARN] [minecraft/EntityType]: Exception loading entity: 
java.lang.NullPointerException: null
	at net.minecraft.entity.ai.attributes.AttributeModifierManager.getAttributeValue(AttributeModifierManager.java:67) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.LivingEntity.getAttributeValue(LivingEntity.java:1849) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.LivingEntity.getMaxHealth(LivingEntity.java:1610) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.LivingEntity.<init>(LivingEntity.java:209) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.MobEntity.<init>(MobEntity.java:108) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.entity.CreatureEntity.<init>(CreatureEntity.java:13) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.AgeableEntity.<init>(AgeableEntity.java:21) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.passive.AnimalEntity.<init>(AnimalEntity.java:37) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.passive.CowEntity.<init>(CowEntity.java:35) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
	at me.minecraft.star.entities.TestEntity.<init>(TestEntity.java:15) ~[main/:?] {re:classloading}
	at net.minecraft.entity.EntityType.create(EntityType.java:448) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
	at net.minecraft.entity.EntityType.lambda$loadEntityUnchecked$1(EntityType.java:459) ~[forge-1.16.4-35.1.4_mapped_snapshot_20201028-1.16.3-recomp.jar:?] {re:classloading}
//removed excess
	at net.minecraft.server.MinecraftServer.runScheduledTasks(MinecraftServer.java:721) ~[forge:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:667) ~[forge:?] {re:classloading,pl:accesstransformer:B}
	at net.minecraft.server.MinecraftServer.lambda$startServer$0(MinecraftServer.java:233) ~[forge:?] {re:classloading,pl:accesstransformer:B}
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_282] {}
[10:19:35] [Render thread/INFO] [minecraft/NewChatGui]: [CHAT] Unable to summon entity

I have tried multiple different methods but for some reason the entity attributes are not being set correctly. I am currently using the method suggested in the topic below with no success. 




Main class:

public class Main {
	//Removed excess
    private void setup(final FMLCommonSetupEvent event)
    	LOGGER.info("STAR - Setup Complete");
    	DeferredWorkQueue.runLater(() -> {
            GlobalEntityTypeAttributes.put(EntityRegister.TESTENTITY_TYPE, TestEntity.setCustomAttributes().create());

Entity Class:

public class TestEntity extends CowEntity {
	//Removed Excess
	public static AttributeModifierMap.MutableAttribute setCustomAttributes() {
        return MobEntity.func_233666_p_().createMutableAttribute(Attributes.MOVEMENT_SPEED,  (double)0.5F).createMutableAttribute(Attributes.MAX_HEALTH, 20.0D).createMutableAttribute(Attributes.ATTACK_DAMAGE, 5.0D);

I am using a deferred register method to register entities and it seems to be registering them successfully in the output. It also appears in the commands autofill.

Any help would be greatly appreciated :)

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  • 3 weeks later...

Okay, so I've tried to add it as a subscribe event but it does not appear to exist. I'm using forge-1.16.4-35.1.4 in the eclipse IDE.

Here is the event I created:

    public void entityAttributeCreationEvent(EntityAttributeCreationEvent event) { //EntityAttributeCreateEvent cannot be resolved to a type

There don't seem to be any import candidates.

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Thanks for all your help. Here is the method that seems to register the attributes correctly.

Entity Class:

public class TestEntity extends CowEntity {

	public static final String REG = "simple_entity";
	public static final EntityType<TestEntity> TYPE = EntityType.Builder.<TestEntity>of(TestEntity::new, EntityClassification.MISC)
			.sized(0.98F, 0.7F)
	public static final AttributeModifierMap MAP = AttributeModifierMap.builder().add(Attributes.MAX_HEALTH, 20.0)
			.add(Attributes.MOVEMENT_SPEED, 20.0)
			.add(Attributes.FOLLOW_RANGE, 20.0)
	public TestEntity(EntityType<? extends CowEntity> p_i48567_1_, World p_i48567_2_) {
		super(p_i48567_1_, p_i48567_2_);

Main Class:

public class Main {
	public Main() {
		IEventBus bus = FMLJavaModLoadingContext.get().getModEventBus();
		LOGGER.info("STAR has been initialised");

	public static void entityAttributeCreationEvent(EntityAttributeCreationEvent event) {
    	LOGGER.info("STAR - Entity Attribute Event");
		event.put(TestEntity.TYPE, TestEntity.MAP);


Now I seem to have an error where there is no defined ai for the entity causing a ticking crash but I'll make a separate topic for that.

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