Development Assistance How to get the UUID of an offline player?

I'm making a cross server economy plugin that uses mysql. I am using UUIDs to store the amount of cubes (my currency) each player has. It was all working, then I realized I can't change or view the value of a player when their offline, because I was doing this by "String uuid = player.getUniqueId()" and this doesn't work for offline players. I have changed all the parameters of the functions to accept strings, and then changed the strings into offline players within each function, but I do not know how to get the UUID of a Bukkit.getOfflinePlayer. Would anyone be able to tell me how this is done?

 

@timtower You can't do ".getUniqueId()" from an offline player.

 

@timtower I'm doing it right now, the ".getUniqueId() only works if it's not an offline player. It comes up red if you do it.

 

@timtower It says to add a cast to player. And then makes it ((Entity) player).getUniqueId().toString().

Then when I try this out on the server, it gives a null pointer error.

I should point out I'm using 1.6 bukkit because my server is on a modpack.

Do you know of any way around this?

<Edit by mrCookieSlime: Merged posts. Please don't triple post. There is an Edit Button right next to the Date.>

 

@ianjohnson315 offlineplayer.getPlayer().getUniqueID().toString();

 

@ianjohnson315 1.6 didn't have UUID's

 

Thanks for all the help guys, I guess I will just have to make it so that it only works for online users.