关于搭建Spring boot 在启动时RequstMappingHandlerMapping无法找到contorller的解决方案

最新推荐文章于 2025-06-12 10:17:32 发布

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最新推荐文章于 2025-06-12 10:17:32 发布

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分类专栏： SpringBoot

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本文分析了SpringBoot应用中出现404错误的原因及解决方法，特别是当遇到WhitelabelErrorPage时如何排查配置问题，确保控制器被正确扫描。

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问题/表象：

Whitelabel Error Page

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

Wed May 09 15:32:02 CST 2018

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

No message available

Console控制台：

2018-05-09 15:31:20.500 INFO 1612 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@60438a68: startup date [Wed May 09 15:31:15 CST 2018]; root of context hierarchy

2018-05-09 15:31:20.700 INFO 1612 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)

2018-05-09 15:31:20.703 INFO 1612 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)

原因/解决方法：

spring boot 默认扫描项目的类是在启动类的当前包和下级包，所以如果启动类和controller的类分别放置在不同包下，controller类所属的包必须为启动类所属包的子包。下面给出出错的包路径和正确的包路径：

出错的：

正确的：

INFO 1784 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/hello]}" onto public java.lang.String com.colde.rootapp.controller.HelloSpringBoot.hello()

2018-05-09 15:59:52.450 INFO 1784 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)

2018-05-09 15:59:52.451 INFO 1784 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)