报错信息

Caused by: java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'quanZiController' method 
public org.springframework.http.ResponseEntity<java.util.List<com.tanhua.server.vo.VisitorsVo>> com.tanhua.server.controller.QuanZiController.queryVisitorsList()
to {[/movements/visitors],methods=[GET]}: There is already 'quanZiController' bean method
public org.springframework.http.ResponseEntity<java.lang.Object> com.tanhua.server.controller.QuanZiController.queryVisitors() mapped.
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.assertUniqueMethodMapping(AbstractHandlerMethodMapping.java:599) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.register(AbstractHandlerMethodMapping.java:567) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.registerHandlerMethod(AbstractHandlerMethodMapping.java:294) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lambda$detectHandlerMethods$1(AbstractHandlerMethodMapping.java:279) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
	at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:684) ~[na:na]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.detectHandlerMethods(AbstractHandlerMethodMapping.java:277) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.processCandidateBean(AbstractHandlerMethodMapping.java:249) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:208) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:196) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:164) ~[spring-webmvc-5.1.2.RELEASE.jar:5.1.2.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1804) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1741) ~[spring-beans-5.1.2.RELEASE.jar:5.1.2.RELEASE]
	... 16 common frames omitted

分析报错信息

初步分析

Caused by：java.lang.IllegalStateException: Ambiguous mapping. Cannot map ‘quanZiController’ method
IllegalStateException：非法状态异常
Ambiguous mapping：模糊影射
Cannot map ‘quanZiController’ method：不能映射quanZiController方法

分析结果

会不会是少写了什么注解
重新梳理…
该写的注解都写了，没问题

再次分析

报错信息再往下看

从图中报错信息可知，在com.tanhua.server.controller目录下的QuanZiController类的queryVisitorsList()方法去往get请求路径/movements/visitors：已经存在quanZiController的bean方法

分析结果

写了两个queryVisitorsList()方法
写了两个get请求路径为/movements/visitors的GetMapping注解

先全局搜索一下queryVisitorsList()这个方法

由图可知此类中只有这一个queryVisitorsList()方法

再搜索一下movements/visitors这个get请求的路径

此时发现此类中居然有两个get请求的路径都是/movements/visitors

点进去查看
发现是最开始写的半成品代码
忘记了，又写了一个这样的方法，所以会同路径，报出这个异常

处理方式

把这个半成品的代码删除就OK了

处理结果

运行，启动成功！！！