title: how to create a field for array of DBRef
body: <p>I'm new to MongoDB.
  In my java code, I have to define a Document.
  One of the fields in this Document has to contain an array of DBRef to other Document.
  How can I create an array of customers?
  How can it be done? what are the alternatives?</p>
  
  <pre><code>@DBRef
  private Customer custId;
  </code></pre>
  
  <p>Thanks,
  Eyal.</p>