报错之前：
@RequestMapping(value = "hi", method = RequestMethod.GET)
String hiService(@RequestParam String name);
修改之后：
@RequestMapping(value = "hi", method = RequestMethod.GET)
String hiService(@RequestParam(name = "name") String name);
问题解决
原文：https://www.cnblogs.com/lzj123/p/10651077.html