title: JSONObject how to store null value
body: <p>I am using <strong>com.liferay.portal.kernel.json.JSONObject</strong> in liferay 6.2 and I want to store null value in an object of this type as mentioned below  </p>
  
  <pre><code>`JSONObject jsonObject = JSONFactoryUtil.createJSONObject();`  
  `jsonObject.put("name","varun")`
  `jsonObject.put("address",null)`  
  </code></pre>
  
  <p>As in <strong>org.json.JSONObject</strong> we can set null by JSONObject.NULL</p>
  
  <p>Is there any way to set null in liferay JSONObject?</p>