I know it's rather simple, but I can't figure it out by myself.

I have item which players are supposed to right click and when that happens it sets the variable to for example x coordinate, and then on left click it shows that value, but if another player perform right click action that variable is set to his x coordinate, but I want that every player have their separate value.

This sounds a lot like a Java question, and it also sounds like you might be using the static keyword. Post some code, I'll take a look.

I know it's rather simple, but I can't figure it out by myself.

I have item which players are supposed to right click and when that happens it sets the variable to for example x coordinate, and then on left click it shows that value, but if another player perform right click action that variable is set to his x coordinate, but I want that every player have their separate value.

 

You have to store the information in the ItemStack's nbt tag, because the Item class is a singleton.  Every field is effectively static.

Item (as class) has only one instance (or rather that many as you register into Game). The Item is a definition of what you are holding, the ItemStack is the thing that actually holds data. You cannot assign ANY data to Item that you don't want to be global. To save data per-item you need to use ItemStack's NBT.

 

You can do that straight from yourItem class. No point in explaining further.

 

www.minecraftforge.net/wiki/Creating_NBT_for_items

 

Post code if you can't figure out why it doesn't work. (note: NBT is null on default).

 

EDIT

Why am I not getting notifications that someone wrote before me? :C

Thanks a lot, that works, but I don't really want that data to be accessible after player left the server.