public class MyErrorRenderFactory implements IErrorRenderFactory{

      public Render getRender(int errorCode, String view) {
           return new MyErrorRender(errorCode, view);
       }
       class MyErrorRender extends ErrorRender {
           public MyErrorRender(int errorCode, String view) {
               super(errorCode, view);
           }
           public void render() {
               //这个里面是可以在域中设置一些值的
 //              request.setAttribute("csspath", "../");
              setView("/error/404.html");
               super.render();

 //             RenderFactory.me().getFreeMarkerRender(view).setContext(request, response).render();
           }
       }
 }

//然后
public void configConstant(Constants me) {
    me.setErrorRenderFactory(new MyErrorRenderFactory());
}