title: Convert a part of Json to HashMap using Jackson ObjectMapper
body: <p>I am trying to unmarshall a json file in a way such that few properties of Json are mapped into a HashMap that is present in my model class.Rest of the properties are mapped to the respective fields of the class.Please find the Json below:</p>
  
  <pre><code>{
           "_id":2,
           "Name":"xyz",
           "Age":20,
           "MEMO_TEXT":"yyy",
           "MEMO_LINK":"zzz",
           "MEMO_DOB":"",
           "MEMO_USERNAME":"linie orange",
           "MEMO_CATEGORY":2,
           "MEMO_UID":"B82071415B07495F9DD02C152E4805EC"
        }
  </code></pre>
  
  <p>And here is the Model class to which I want to map this Json:</p>
  
  <pre><code>public class Model{
  
      private int                              _id;
      private String                           name;
      private int                              age
      private HashMap&lt;String, String&gt; columns;
  
      //Getters and Setter methods
  }
  </code></pre>
  
  <p>So here, what i want is to get a map <code>columns</code> that contains keys <code>"MEMO_TEXT","MEMO_LINK","MEMO_DOB","MEMO_USERNAME","MEMO_CATEGORY","MEMO_UID"</code></p>
  
  <p>and rest of the properties in Json are mapped to their respective fields.</p>
  
  <p>Is it possible to do this using ObjectMapper of Jackson Library?</p>