今天做SpringBoot小例子，在请求controller层的时候出现如下问题。

Whitelabel Error Page

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

Wed Dec 14 16:35:25 CST 2016
There was an unexpected error (type=Not Found, status=404).
No message available

问题很像是没有访问地址不对，第一感觉以为url写的不对。

其实不是，真正的原因是【Application启动类放的位置不对】要将Application放在最外层，也就是要包含所有子包。

比如你的groupId是com.google,子包就是所谓的com.google.xxx,所以要将Application类要放在com.google包下。

springboot会自动加载启动类所在包下及其子包下的所有组件.

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