映射导致的错误@RequestMapping("/")_nested exception is java.lang.illegalstateexceptio-优快云博客

本文介绍了 Spring MVC 中出现的映射冲突问题，具体表现为两个控制器的方法试图映射到同一个 URL 路径上，导致应用程序启动失败。通过示例展示了如何定位此类问题并提供了解决思路。

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错误：映射导致得错误

@Controller类默认使用@RequestMapping("/")，所以该类下得方法不能再使用该映射
在这里插入图片描述
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘requestMappingHandlerMapping’ defined in class path resource [org/springframework/web/servlet/config/annotation/DelegatingWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map ‘templateController’ method
public java.lang.String com.example.web.templateController.index(org.springframework.ui.ModelMap)
to {[/]}: There is already ‘helloController’ bean method
public java.lang.String com.example.web.helloController.index() mapped.
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1699) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:573) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBeanMappingRegistry.assertUniqueMethodMapping(AbstractHandlerMethodMapping.java:580) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping $M a p p i n g R e g i s t r y . r e g i s t e r (A b s t r a c t H a n d l e r M e t h o d M a p p i n g . j a v a : 544) [s p r i n g - w e b m v c - 5.0.8 . R E L E A S E . j a r : 5.0.8 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . w e b . s e r v l e t . h a n d l e r . A b s t r a c t H a n d l e r M e t h o d M a p p i n g . r e g i s t e r H a n d l e r M e t h o d (A b s t r a c t H a n d l e r M e t h o d M a p p i n g . j a v a : 265) [s p r i n g - w e b m v c - 5.0.8 . R E L E A S E . j a r : 5.0.8 . R E L E A S E] a t o r g . s p r i n g f r a m e w o r k . w e b . s e r v l e t . h a n d l e r . A b s t r a c t H a n d l e r M e t h o d M a p p i n g . l a m b d a$ detectHandlerMethods$1(AbstractHandlerMethodMapping.java:250) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at java.util.LinkedHashMap.forEach(LinkedHashMap.java:684) ~[na:1.8.0_92]
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.detectHandlerMethods(AbstractHandlerMethodMapping.java:248) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:218) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:188) ~[spring-webmvc-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:136) ~[spring-webmvc-5
0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1758) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1695) ~[spring-beans-5.0.8.RELEASE.jar:5.0.8.RELEASE]
… 52 common frames omitted