/**
   * Set in the given request the ActionErrors for the struts tag 'html:errors'.
   *
   * @param errors
   * @param request the HttpServletRequest
   */
   public   static   void  setErrors (ActionErrors errors, HttpServletRequest request)
  {
    request.setAttribute (Globals.ERROR_KEY, errors);
  }

/**
   * Set in the given request a error message for the struts tag 'html:errors'.
   *
   * @param property    is equivalent to the property attribute of the tag 'html:errors'
   * @param resourceKey the error key of the application resources
   * @param request     the HttpServletRequest
   */
   public   static   void  setErrors (String property, String resourceKey, HttpServletRequest request)
  {
    ActionErrors errors =  new  ActionErrors ();
    errors.add (property,  new  ActionMessage (resourceKey));
    request.setAttribute (Globals.ERROR_KEY, errors);
  }

/**
   * Update.
   */
   public  ActionForward updateRow (ActionMapping actionMapping, ActionForm actionForm,
                                  HttpServletRequest request, HttpServletResponse response)
  {
    
    MyForm form = (MyForm) actionForm;   

     if  (isValidForUpdate (form, request)) {    
         
          performUpdateRow (actionMapping, actionForm, request, response);
        }     

     return  actionMapping.findForward (FORWARD_SUCCESS);
  }
// ---------------------------------------------------------------
  // Validierung 
  // ---------------------------------------------------------------

   private   boolean  isValidForUpdate (MyForm form, HttpServletRequest request)
  {
    ActionErrors errors =  new  ActionErrors ();
....
   бла бла бла
....
    setErrors (errors, request);

     return  errors.isEmpty ();
  }