is there a way to set my player unique id on start up

That is the UUID for player accounts that would screw with things why would you want to set it? What is your goal?

i want to be the owner of my entity prementantly , since each time i exit the client it resets me when i come back in

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

EntityPlayer#readFromNBT()

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

 

nvm i understand your problem now are you using eclipse?

 

both eclipse and jidea, both same results, testing on wolfs too, on entry they are sitted and i cant give them a bone either

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

 

awsome thank you