title: Got "unsupported class file version 52.0" after including a module to a project
body: <p>After creating an empty project within Android Studio and including a pure java module, which compiles and works perfectly on its own, I get the following error on every single class within that module:</p>
  
  <p><code>Error:PARSE ERROR: Error:unsupported class file version 52.0</code></p>
  
  <p>I tried to run the project using the embedded JDK and the one that I have on my system - JDK 8 (1.8.0_91), the result is the same.</p>
  
  <p>Note this, that I don't include the module as <code>.jar</code> library, it is source code which is importing with following instruction:</p>
  
  <pre><code>include ':app', ':my-module'
  project(':my-module').projectDir = new File(settingsDir, '../my-module-java')
  </code></pre>