JFinal render或redirect没有跳转?报错

现在有如下的代码，保存操作返回的结果flag是true，数据也录入了数据库，就是页面没有执行跳转，render和redirect都没有效果，而且控制台也没有报错，这是为什么呢？

public void register() {
		UploadFile uploadFile = getFile("user.img","icon/");
		// 重命名
		File file = uploadFile.getFile();
		String filePath = uploadFile.getSaveDirectory();
		String fileName = System.currentTimeMillis() + file.getName().substring(file.getName().lastIndexOf('.'), file.getName().length());;
		file.renameTo(new File(filePath+fileName));
		
		User user = getModel(User.class, "user");
		user.set("address", getPara("user.province")+getPara("user.address"));
		user.set("img", "/upload/icon/"+fileName);
		
		Boolean flag = user.save();
		System.out.println(flag);
		if(flag){
			//render("/login.html");
			redirect("/login");
		} else {
			render("/common/error.html");
		}
	}

true

JFinal action report -------- 2016-01-12 10:17:58 ------------------------------
Controller  : com.jfinal.demo.controller.UserController.(UserController.java:1)
Method      : register
Parameter   : user.name=123  user.wechat=  user.qq=  user.tel=13726942432  user.address=123456  user.sex=男  user.province=123  
--------------------------------------------------------------------------------

JFinal action report -------- 2016-01-12 10:17:58 ------------------------------
Controller  : com.jfinal.demo.controller.IndexController.(IndexController.java:1)
Method      : login
--------------------------------------------------------------------------------