title: Project sdk 1.7 with Project language level 8
body: <p>Is the following a valid combination:
  Project SDK 1.7 with Project language level 8.</p>
  
  <p><a href="https://i.stack.imgur.com/HQl4x.png" rel="nofollow"><img src="https://i.stack.imgur.com/HQl4x.png" alt="enter image description here"></a></p>
  
  <p>I keep hitting:</p>
  
  <blockquote>
    <p>Error:java: invalid source release: 1.8</p>
  </blockquote>
  
  <p>But I don't want to delete my lambdas.</p>