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How can i set player.UniqueId on startup


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players UUID is not reset when you exit the client the UUID is saved to the world 


  if (compound.hasUniqueId("UUID"))
                this.entityUniqueID = compound.getUniqueId("UUID");
                this.cachedUniqueIdString = this.entityUniqueID.toString();


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you problem is that when in a development environment forge uses "fake" minecraft accounts that change every game there are here is how to fix


it is kinda risky if you are really password overprotective

but in eclipse go to Run>Run Configurations>Java Application>Client>Arguments>Program Arguments then enter

--username=(your minecraft login email or username) --password=(your minecraft password)

No Parentheses Obviously

When you start the game next it will automatically log you in with your minecraft account


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