title: Model object becomes null. Is there any change required for ModelDriven interface when upgrading from struts 2.3.35 to 2.5.26?
body: <p>Does migration from 2.3.35 to 2.5.26 needs any change to use ModelDriven interface?</p>
  <p>I have an action class that implements ModelDriven interface. It was working fine with struts 2.3.35. After upgrading to struts 2.5.26, <strong>the model becomes null when we try to fetch it</strong>.</p>
  <p>This is the reference code:</p>
  <pre><code>public class MyAction extends MyBaseAction
          implements ModelDriven&lt;BulkModel&gt;, ServletRequestAware, ServletResponseAware {
  
  private BulkModel bulkModel;
  
  public MyAction getModel() {
         if(null==bulkModel){
           bulkModel = new BulkModel();
         }
          return bulkModel;
  }
  
  public myMethod(){
  System.out.println(bulkModel.getName());
  }
  
  }
  </code></pre>
  <p>I use both these interceptors for my action:</p>
  <pre><code>            &lt;interceptor-ref name=&quot;scopedModelDriven&quot; /&gt;
              &lt;interceptor-ref name=&quot;modelDriven&quot; /&gt;
  </code></pre>