springboot+thymeleaf项目，运行时页面报错信息如下：
This application has noexplicitmappingfor/error, so you are seeing thisasa fallback.Sat Dec2315:25:59CST2017There was an unexpectederror(type=NotFound, status=404).No message available
有可能出错的原因：
1.没有在pom文件中添加thymeleaf的依赖
2.在浏览器中输入的url不对
url应该是／cotroller map／map
例如以下代码访问地址：http://localhost:8080/hhllow/getUList
@RequestMapping(value="/hhllow")
public class UlevelController {
@RequestMapping(value="getUList", method=RequestMethod.GET)
