title: How to update only a part of all entity attributes with Hibernate
body: <p>I receive a JSON with 30 fields, and my entity is built from this JSON.
  The problem is: two fields shouldn't be updated (two dates).</p>
  
  <p>If I use <code>entity.merge</code>, both fields will be updated.</p>
  
  <p>How can I avoid that those 2 fields get updated?</p>
  
  <p>Maybe using criterion.Example?</p>
  
  <p>Is there some way to do this without me writing a ton of HQL?</p>