The essence of this code, when any player appears at coordinates 120 x 20 at z and at any height, he will be teleported 2 blocks back at x and z coordinates and will write a message that other players cannot see in any way
 

import com.mojang.authlib.GameProfile;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.util.math.BlockPos;
import net.minecraft.util.math.vector.Vector3d;
import net.minecraft.util.text.StringTextComponent;
//import net.minecraft.util.text.TranslationTextComponent;
import net.minecraft.world.World;

public class ClassName extends PlayerEntity{
    
    public ClassName(World p_i241920_1_, BlockPos p_i241920_2_, float p_i241920_3_, GameProfile p_i241920_4_) {
        super(p_i241920_1_, p_i241920_2_, p_i241920_3_, p_i241920_4_);
        
        
        
        Vector3d no_escape = new Vector3d(120.000, position().y, 20.000);
        Vector3d PlPos = position();
            
            if(PlPos.x == no_escape.x && PlPos.z==no_escape.z) {
            teleportTo(no_escape.x-2, no_escape.y-0, no_escape.z-2);
            sendMessage(new StringTextComponent("No way!"), getUUID());
            
            }
        }

    
    
    
    
    
    

    @Override
    public boolean isSpectator() {
        
        return false;
    }

    @Override
    public boolean isCreative() {
        
        return false;
    }

}
 

Edited August 23, 20214 yr by NastyStuffy

2 hours ago, diesieben07 said:

Why are you extending PlayerEntity? Doing so makes no sense.

Why are you doing stuff in the constructor?

1. It's more convenient for me 2.It is forbidden?

Edited August 23, 20214 yr by NastyStuffy

what do you try to achieve

2 hours ago, Luis_ST said:

what do you try to achieve

 

I want to create coordinates that cannot be teleported, and stand on them

Edited August 23, 20214 yr by NastyStuffy

what? if you want to disable the teleporter of the player, use the EntityTeleportEvents

2 hours ago, Luis_ST said:

what? if you want to disable the teleporter of the player, use the EntityTeleportEvents

Using this event, you can turn off teleportation and prohibit being on the territory or on the block?

1 minute ago, NastyStuffy said:

Using this event, you can turn off teleportation

yes

1 minute ago, NastyStuffy said:

prohibit being on the territory or on the block?

use the TickEvent.Player for this,
you need to set the motion of the player to 0 if the block in his walking direction is the block he shouldn't enter