Make an item that behaves like a spawn egg

[lavish tendon]

I'm trying to make a custom item that behaves like a spawn egg:
StartupEvents.registry('item', e => {
const $SpawnEggItem = Java.loadClass('net.minecraft.world.item.SpawnEggItem')
const $ItemProperties = Java.loadClass('net.minecraft.world.item.Item$Properties')
const $EntityType = Java.loadClass('net.minecraft.world.entity.EntityType')
e.custom('cow_bait', new $SpawnEggItem($EntityType.COW, 4470310, 10592673, new $ItemProperties))
})

The error I get:
There were KubeJS startup errors [1]!

1. Error occurred while handling event 'StartupEvents.registry': java.lang.IllegalStateException:
   Registry is already frozen

The log is in the txt. Thanks!

[drowsy crest]

Once your ticket has been resolved, please close it with </ticket close:1054771505520717835> command!

[grave creek]

Paste version of message.txt from @lavish tendon

[gloomy helm]

??codeblock

[grave creek]

You can write your code in a codeblock by typing it between the codeblock delimiters:

```js :arrow_left:

ServerEvents.recipes(event => {
event.smelting('minecraft:glass', '#forge:sand').xp(.1)
})

``` :arrow_left:

As an example, :arrow_up: will look like this:

ServerEvents.recipes(event => {
  event.smelting('minecraft:glass', '#forge:sand').xp(.1)
})

[mortal crypt]

use event.createCustom and pass it a supplier

[gloomy helm]

^

[mortal crypt]

event.createCustom('my_id', () => new MyThing())

[lavish tendon]

Thank you! I'll try it!

I did not get an error this way launching the game, but there were no cow_bait custom item, but strangely the cow spawn egg lost it's color.

[gloomy helm]

[lavish tendon]

e.createCustom('cow_bait', () => new $SpawnEggItem($EntityType.COW, 4470310, 10592673, new $ItemProperties))

[gloomy helm]

try this:

const $SpawnEggItem = Java.loadClass('net.minecraft.world.item.SpawnEggItem')
const $ItemProperties = Java.loadClass('net.minecraft.world.item.Item$Properties')
const $EntityType = Java.loadClass('net.minecraft.world.entity.EntityType')

StartupEvents.registry('item', e => {
    e.createCustom('cow_bait', () => new $SpawnEggItem($EntityType.COW, 4470310, 10592673, new $ItemProperties()))
})

[lavish tendon]

I'll try it

The same thing happened this way too

[gloomy helm]

[mortal crypt]

use forges spawn egg item

net.minecraftforge.common.ForgeSpawnEggItem
public ForgeSpawnEggItem(Supplier<? extends EntityType<? extends Mob>> type, int backgroundColor, int highlightColor, Properties props)

[lavish tendon]

const $ForgeSpawnEggItem = Java.loadClass('net.minecraftforge.common.ForgeSpawnEggItem')
const $ItemProperties = Java.loadClass('net.minecraft.world.item.Item$Properties')
const $EntityType = Java.loadClass('net.minecraft.world.entity.EntityType')
StartupEvents.registry('item', e => {
    e.createCustom('cow_bait', () => new $ForgeSpawnEggItem($EntityType.COW, 4470310, 10592673, new $ItemProperties()))
})

The game crashes:
The game crashed whilst initializing game
Error: java.lang.RuntimeException: null

[gloomy helm]

send the full error

[grave creek]

Paste version of message.txt from @lavish tendon

[mortal crypt]

the first arg needs to be a supplier for the forge egg

see the constructor args i pasted

[lavish tendon]

damn sorry i didnt see that

Sorry I'm new to all this and I don't really understand what are suppliers or how to use them, so if you could maybe help me out again, I would be very grateful

[mortal crypt]

put () => before it

[lavish tendon]

const $ForgeSpawnEggItem = Java.loadClass('net.minecraftforge.common.ForgeSpawnEggItem')
const $ItemProperties = Java.loadClass('net.minecraft.world.item.Item$Properties')
const $EntityType = Java.loadClass('net.minecraft.world.entity.EntityType')
StartupEvents.registry('item', e => {
    e.createCustom('cow_bait', () => new $ForgeSpawnEggItem(() => $EntityType.COW, 4470310, 10592673, new $ItemProperties()))
})

Now there was no crash, but it seems that the item wasn't created. I can't find it with the give command.

[mortal crypt]

/give @s kubejs:cow_bait?

[lavish tendon]

I just restarted the game and it was there, sorry I don't know what happened

Thanks for the help!!!