This application has no explicit mapping for /error, so you are seeing this as a fallback.

一個簡單的spring boot 模板 寫一個/hello的controller，啟動main,訪問http://localhost:8080/hello后一直報錯：

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Tue May 08 13:41:33 CST 2018

There was an unexpected error (type=Not Found, status=404).

No message available

解決辦法：

啟動main一定要放在groupId下面，我的groupId為com.ly，之前我的放在com.ly.demo下一直出現這個問題，修改到com.ly后成功。