[SOLVED][1.18]LeftClickBlock ,AttackEntityEvent will throw an object, but LeftClickEmpty will not work

[ocome]

LeftClickBlock ,AttackEntityEvent ,LeftClickEmpty as a test when detected, similar functionality to "Ender pearl"

    public static void Birch_Gun_Shot(Player player, Item playermainhanditem){
        Item items = ModItems.BIRCH_GUN.get();
        if (playermainhanditem==items) {
            ItemStack itemstack = player.getMainHandItem();
            player.level.playSound((Player)null, player.getX(), player.getY(), player.getZ(), SoundEvents.ENDER_PEARL_THROW, SoundSource.NEUTRAL, 0.5F, 0.4F / (player.level.getRandom().nextFloat() * 0.4F + 0.8F));
            player.getCooldowns().addCooldown(ModItems.BIRCH_GUN.get(), 20);
            //if (!player.level.isClientSide) {
                ThrownEnderpearl thrownenderpearl = new ThrownEnderpearl(player.level, player);
              //  ThrownEnderpearl thrownenderpearl = new LargeFireball(player.level, player, d2, d3, d4, 10);
                thrownenderpearl.setItem(itemstack);
                thrownenderpearl.shootFromRotation(player, player.getXRot(), player.getYRot(), 0.0F, 1.5F, 1.0F);
                player.level.addFreshEntity(thrownenderpearl);
           // }
        }
    }

I implemented it in the same way, but I would like to know why the object is not executed only in the case of empty!

Edited March 7, 2022 by ocome

[ocome]

I made a temporary comment to check.

https://mcforge.readthedocs.io/en/1.18.x/networking/simpleimpl/#sending-packets

I am not familiar with this, but I assume you mean to use this

[ocome]

It could function.
I have a few questions.
1. Why is only Empty provided server-side?

2. Why is there not a simple method like Item use?
Expect :because no such functionality exists in vanilla.

3. I know there are exceptions, but I felt that all of these could be implemented via the server.
I know that implementing everything via the network would not be clean code and would cause processing problems.
But what is the reason for this separation?
(Of course I am happy and grateful that there is a class for this.)

I also think this requires network knowledge of java itself.　In that case I'll study it.

Edited March 6, 2022 by ocome

[ocome]

  On 3/6/2022 at 3:23 PM, diesieben07 said:

You mean client side. The reason is that the client does not tell the server when the player left clicks with an empty hand. The server simply does not know.

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 Oh, right,  empty-handed detection.

  On 3/6/2022 at 3:23 PM, diesieben07 said:

I have no idea what you are talking about.

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public InteractionResultHolder<ItemStack> use(Level p_41190_, Player p_41191_, InteractionHand p_41192_) {}

Why there is no method equivalent to this left click
Sorry, that's an off-topic question.

  On 3/6/2022 at 3:23 PM, diesieben07 said:

What?

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question:Why not just have everything communicate with both client and server?
I said something strange.　I could understand it .

Edited March 6, 2022 by ocome

[ocome]

I see, thanks for answering my question!