title: javac: target release 7 conflicts with default source release 1.8
body: <p>I am playing with javac and I cant compile simple java class to 1.7 version.</p>
  
  <pre><code>C:\Tests&gt;javac -target 7 GreetingsUniverse.java -nowarn
  javac: target release 7 conflicts with default source release 1.8
  
  C:\Tests&gt;javac -version
  javac 1.8.0_73
  </code></pre>
  
  <p>What could be the reason?</p>