use -source 7 or higher

Question

While trying to build a project using intelliJ Ultimate 12 I am getting these errors

use -source or higher to enable diamond operator
use -source 7 or higher         


        

Answer 1

I had the same problem and was struggling. Auto-import was true, re-import of project was not working and tried all possible options. But finally i found the solution.

"Reimport All Maven Projects" did the trick for me.
You can find the option on the Maven Project tab.