第一个helloworld访问报错

liuy

我按照开发文档里的helloworld例子写了一个 但是访问页面报错：
helloworld写在了
Whitelabel Error Page

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

Thu Feb 24 12:03:12 CST 2022
There was an unexpected error (type=Not Found, status=404).
No message available