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[SOLVED][1.15.2] Custom Entity Spawning on Server but not Client?


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My custom entity:

public class BeamAttackEntity extends Entity {
    private Vec3d to;
    private int lifeTicksRemaining;
    private Entity sourceEntity;

    public BeamAttackEntity(EntityType<? extends BeamAttackEntity> entityType, World world) {
        super(entityType, world);

    public BeamAttackEntity(Vec3d from, Vec3d to, int lifeTicks, World world) {
        super(ModEntityTypes.BEAM_ATTACK.get(), world);
        this.setPosition(from.x, from.y, from.z);
        this.to = to;
        this.lifeTicksRemaining = lifeTicks;
        this.sourceEntity = null;

    public BeamAttackEntity(Entity sourceEntity, Vec3d to, int lifeTicks, World world) {
        super(ModEntityTypes.BEAM_ATTACK.get(), world);
        Vec3d entityPos = sourceEntity.getPositionVec();
        this.setPosition(entityPos.x, entityPos.y, entityPos.z);
        this.to = to;
        this.lifeTicksRemaining = lifeTicks;

    protected void registerData() {


    protected void readAdditional(CompoundNBT compound) {


    protected void writeAdditional(CompoundNBT compound) {
        final CompoundNBT beamData = new CompoundNBT();


    public IPacket<?> createSpawnPacket() {
        return new SSpawnObjectPacket(this);

    public void tick() {
        CelticShift.LOGGER.info("in entity {}", this.lifeTicksRemaining);
        if (this.lifeTicksRemaining > 0) {
        } else {

    public int getLifeTicksRemaining() {
        return this.lifeTicksRemaining;


Deferred registry:

public static final DeferredRegister<EntityType<?>> ENTITY_TYPES = DeferredRegister.create(ForgeRegistries.ENTITIES, CelticShift.MOD_ID);

public static final RegistryObject<EntityType<BeamAttackEntity>> BEAM_ATTACK = ENTITY_TYPES.register("beam_attack",
            () -> EntityType.Builder.<BeamAttackEntity>create(BeamAttackEntity::new, EntityClassification.MISC)
                    .size(0.5f, 0.5f)
                    .build(new ResourceLocation(CelticShift.MOD_ID, "beam_attack").toString()));


Context in which I'm spawning it (in the AI goal for another, functional entity -- modeled after how the Ghast spawns fireballs):

BeamAttackEntity beamAttackEntity = new BeamAttackEntity(this.subject, this.subject.getPositionVec().add(10, 0, 10), 30, world);


What I am observing is that the logger message in the entity class prints out for the server, but not the client. There's also no evidence (using dev tools, since I do not have a renderer set up yet) that the entity is coming client side at all.

Am I missing a step somewhere?

Edited by Woodside
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18 minutes ago, Curle said:

The Spawn Packet must be made with the static function in NetworkHooks, do not use the vanilla packet. 

That should solve the problem.


19 minutes ago, diesieben07 said:

SSpawnObjectPacket only works for vanilla entities. You have to use NetworkHooks.getEntitySpawningPacket.


Grand. Thank you both!

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  • Woodside changed the title to [SOLVED][1.15.2] Custom Entity Spawning on Server but not Client?

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