How to Intialize the AM & VO in OAF

public void processFormRequest(OAPageContext pageContext, OAWebBean webBean)

  {

    super.processFormRequest(pageContext, webBean);

   

      /* The below code line is used to initialize the application module */

 OAApplicationModule am=(OAApplicationModule)pageContext.getApplicationModule(webBean);

      /* The below code line is used to initialize VO*/

        OAViewObject vo=(OAViewObject)am.findViewObject("DataDisplayVO1");

      /* DataDisplayVO1 is the instance name in AM which is the original name of the VO */

      if(pageContext.getParameter("Go")!=null)

        {

             vo.setWhereClause(null);

              vo.setWhereClause("1=1");

           vo.executeQuery();

         }

       /*To clear the data form the table region */ 

      if(pageContext.getParameter("Clear")!=null)

      {

      vo.setWhereClause(null);

       vo.setWhereClause("1=2");

       vo.executeQuery();

      }

}