code: public void setResponse(Object response)
      {
          ExternalContext ctx = _MyFacesExternalContextHelper.firstInstance.get();
          
          if (ctx == null)
          {
              throw new UnsupportedOperationException();
          }
          
          ctx.setResponse(response);
      }
docs: throws <code>UnsupportedOperationException</code> by default.
  
  @since JSF 1.2
  @param response