title: Android Room - error: Cannot figure out how to save this field into database
body: <p>Detailed log </p>
  
  <pre><code>error: Cannot figure out how to save this field into database. You can 
  consider adding a type converter for it.
  private final java.util.Date mTime = null;
  </code></pre>
  
  <p>I have an entity with a field as</p>
  
  <pre><code>var mStartTime : Date = Date() // java.util.Date
  </code></pre>
  
  <p>Why cant Room persist Date objects? What can be best converter for Date? </p>