Listing 1. SearchAction's execute() method passes SearchForm, a subclass of ActionForm, to the SearchFacade to create tight coupling between Struts and the persistence tier.

public class SearchAction extends Action{
  public ActionForward execute(
  ActionMapping mapping, ActionForm form, 
  HttpServletRequest request, HttpServletResponse 
  response){
  // gets a collection of results from the search 
  // facade 
  SearchFacade facade = new SearchFacade(); 
  Collection results = facade().find((
    SearchForm)form); 
  //adds the results to the request object 
  request.setAttribute("results",results); 
  // forwards to the results page 
  return mapping.findForward("results.jsp"); 
  } 
}
... 
public class SearchFacade{
  public Collection find(SearchForm form){
    Collection collection = null;
    // the type here is a subclass of ActionForm and 
    // tightly bound to Struts 
      String keyword = form.getKeyword(); 
      Date startDate = form.getStartDate(); 
      Date endDate = form.getEndDate();
      // execute a search on the data source 
      return collection; 
  } 
}