First port of entry

Hi everyone

I'm going to Barcelona and I got a schengen visa from Spain. However, my flight there includes transit in Frankfurt and I'm planning to spend my transit in the city because it's 9 hours. Will it be a problem that I enter Germany before Spain? For context I'm ONLY going to Barcelona and spending 2 weeks there. Also, I have another option of a flight with two schengen stops (just short transit) before reaching barcelona. Again will that be an issue? I don't want it to ruin my trip or be a reason for future visa refusals.