EntityMod.java

public class EntityMod {

    @SubscribeEvent
    public static void registerEntities(final RegistryEvent.Register<EntityType<?>> event){
        event.getRegistry().register(PossessedEntity.TYPE);
    }
    @SubscribeEvent
    public static void registerEntityEggs(final RegistryEvent.Register<Item> event) {
        event.getRegistry().register(PossessedEntity.EGG);
    }
    @SubscribeEvent
    public static void entityRenderers(final EntityRenderersEvent.RegisterRenderers event){
        event.registerEntityRenderer(PossessedEntity.TYPE, PossessedRendererFactory.INSTANCE);
    }
    @SubscribeEvent
    public static void onAttributeCreate(EntityAttributeCreationEvent event) {
        event.put(PossessedEntity.TYPE, PossessedEntity.createAttributes().build());
    }

}