IntelliJ: Set source compatability version plus make suggestions no longer suggest unsupported features

Question

I have the SE JDK 1.8.0_45 installed on my computer. I want both source and target versions of the compiler to be 1.7.

I did so successfully in gradle, but I cannot figure out how to do that in IntelliJ IDEA 14.1.3 (Community Edition).

I want the IDE to give out errors when 1.8 features are used and I also do not want it to suggest my anything 1.8.

When I use 1.8 features (ex. a lambda expression) and then run gradle (which is set up properly as already mentioned) then the compile step will error, saying that it does not support what I typed, but the IDE is not giving me any error output before, which is what I want to achieve.

Answer 1

Select your project, press CMD+ENTER -> PROJECT -> PROJECT SDK (pick your SDK, e.g. 1.8) and PROJECT LANGUAGE LEVEL (change it to level 7).