String entityName = "minecraft:creeper";
		Optional<EntityType<?>> entityTypeOptional = EntityType.get(entityName);
		if (!entityTypeOptional.isPresent())
		{
			log.error("Entity type " + entityName + " doesn't exist. Maybe you made a typo?");
		}

		world.getPlayers().forEach(player -> {
			if (!entityTypeOptional.isPresent())
			{
				player.sendMessage(new LiteralText("ERROR: Entity type " + entityName + " doesn't exist"), false);
				return;
			}

			Entity entity = entityTypeOptional.get().create(world);
			if (entity == null)
			{
				// something very very bad has happened in the game
				log.error("Failed spawning entity " + entityName + " for player " + player.getName().asString());
				return;
			}
			entity.setPos(player.getX(), player.getY(), player.getZ());
			world.spawnEntity(entity);
		});