title: Spring Mongo DB Query (if id is not null)
body: <p>I developpemnt on spring projects. I'm using mongodb and spring data.</p>
  
  <p>I need to support.</p>
  
  <pre><code>Query query = new Query(Criteria.where("owner.$id").is(user.getId()).( and("idea.$id").is(null));)
  </code></pre>
  
  <p>i want  that <code>("idea.$id").is( not null)</code></p>
  
  <p>How can i do?</p>