title: IntelliJ IDEA unable to build Java -source 8 project via Gradle
body: <p>I am using IntelliJ IDEA 2020.1.2 and I am getting the message:</p>
  
  <p><em>"default methods are not supported in -source 7"</em> </p>
  
  <p>and that I may use:</p>
  
  <p>"<em>-source 8 or higher" when I'm building my project via Gradle."</em></p>
  
  <p>I have ensure that the Project SDK is at least 1.8 and project language level is 8 in every module in the Project Structure.</p>
  
  <p>Java compiler Javac is working with project bytecode version 8.</p>
  
  <p>What could I be missing? Any help or advice is appreciated.</p>
  
  <p>Thank you.</p>