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

None of the above worked for me.

I had to explicitly add the following plugin statement to my pom.xml:

  
    org.apache.maven.plugins
    maven-compiler-plugin
    
      1.7
      1.7
    
  

(Well, IDEA made it for me when I clicked the red help lamp and selected "Set project Java level to 7", so maybe try that if this also doesn't work).