Ambiguous mapping Cannot map xxx method的解决方式

出现的报错信息

"D:\JetBrains\IntelliJ IDEA 2019.3.1\jbr\bin\java.exe" -XX:TieredStopAtLevel=1 -noverify -Dspring.output.ansi.enabled=always -Dcom.sun.management.jmxremote -Dspring.jmx.enabled=true -Dspring.liveBeansView.mbeanDomain -Dspring.application.admin.enabled=true "-javaagent:D:\JetBrains\IntelliJ IDEA 2019.3.1\lib\idea_rt.jar=55854:D:\JetBrains\IntelliJ IDEA 2019.3.1\bin" -Dfile.encoding=UTF-8 -classpath F:\Git_Reporistory\AutoInterfaceTest\chapter13\target\classes;D:\apache-maven-3.6.3\repository\org\springframework\boot\spring-boot-starter-web\2.2.0.RELEASE\spring-boot-starter-web-2.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\springframework\boot\spring-boot-starter\2.2.0.RELEASE\spring-boot-starter-2.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\springframework\boot\spring-boot\2.2.0.RELEASE\spring-boot-2.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\springframework\boot\spring-boot-autoconfigure\2.2.0.RELEASE\spring-boot-autoconfigure-2.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\springframework\boot\spring-boot-starter-logging\2.2.0.RELEASE\spring-boot-starter-logging-2.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;D:\apache-maven-3.6.3\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;D:\apache-maven-3.6.3\repository\org\apache\logging\log4j\log4j-to-slf4j\2.12.1\log4j-to-slf4j-2.12.1.jar;D:\apache-maven-3.6.3\repository\org\apache\logging\log4j\log4j-api\2.12.1\log4j-api-2.12.1.jar;D:\apache-maven-3.6.3\repository\org\slf4j\jul-to-slf4j\1.7.28\jul-to-slf4j-1.7.28.jar;D:\apache-maven-3.6.3\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;D:\apache-maven-3.6.3\repository\org\springframework\spring-core\5.2.0.RELEASE\spring-core-5.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\springframework\spring-jcl\5.2.0.RELEASE\spring-jcl-5.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\yaml\snakeyaml\1.25\snakeyaml-1.25.jar;D:\apache-maven-3.6.3\repository\org\springframework\boot\spring-boot-starter-json\2.2.0.RELEASE\spring-boot-starter-json-2.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\com\fasterxml\jackson\core\jackson-databind\2.10.0\jackson-databind-2.10.0.jar;D:\apache-maven-3.6.3\repository\com\fasterxml\jackson\core\jackson-core\2.10.0\jackson-core-2.10.0.jar;D:\apache-maven-3.6.3\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.10.0\jackson-datatype-jdk8-2.10.0.jar;D:\apache-maven-3.6.3\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.10.0\jackson-datatype-jsr310-2.10.0.jar;D:\apache-maven-3.6.3\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.10.0\jackson-module-parameter-names-2.10.0.jar;D:\apache-maven-3.6.3\repository\org\springframework\boot\spring-boot-starter-tomcat\2.2.0.RELEASE\spring-boot-starter-tomcat-2.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.27\tomcat-embed-core-9.0.27.jar;D:\apache-maven-3.6.3\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.27\tomcat-embed-el-9.0.27.jar;D:\apache-maven-3.6.3\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.27\tomcat-embed-websocket-9.0.27.jar;D:\apache-maven-3.6.3\repository\org\springframework\boot\spring-boot-starter-validation\2.2.0.RELEASE\spring-boot-starter-validation-2.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\jakarta\validation\jakarta.validation-api\2.0.1\jakarta.validation-api-2.0.1.jar;D:\apache-maven-3.6.3\repository\org\hibernate\validator\hibernate-validator\6.0.17.Final\hibernate-validator-6.0.17.Final.jar;D:\apache-maven-3.6.3\repository\org\jboss\logging\jboss-logging\3.4.1.Final\jboss-logging-3.4.1.Final.jar;D:\apache-maven-3.6.3\repository\org\springframework\spring-web\5.2.0.RELEASE\spring-web-5.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\springframework\spring-beans\5.2.0.RELEASE\spring-beans-5.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\springframework\spring-webmvc\5.2.0.RELEASE\spring-webmvc-5.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\springframework\spring-aop\5.2.0.RELEASE\spring-aop-5.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\springframework\spring-context\5.2.0.RELEASE\spring-context-5.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\springframework\spring-expression\5.2.0.RELEASE\spring-expression-5.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\io\springfox\springfox-swagger2\2.6.1\springfox-swagger2-2.6.1.jar;D:\apache-maven-3.6.3\repository\io\swagger\swagger-annotations\1.5.10\swagger-annotations-1.5.10.jar;D:\apache-maven-3.6.3\repository\io\swagger\swagger-models\1.5.10\swagger-models-1.5.10.jar;D:\apache-maven-3.6.3\repository\com\fasterxml\jackson\core\jackson-annotations\2.10.0\jackson-annotations-2.10.0.jar;D:\apache-maven-3.6.3\repository\io\springfox\springfox-spi\2.6.1\springfox-spi-2.6.1.jar;D:\apache-maven-3.6.3\repository\io\springfox\springfox-core\2.6.1\springfox-core-2.6.1.jar;D:\apache-maven-3.6.3\repository\io\springfox\springfox-schema\2.6.1\springfox-schema-2.6.1.jar;D:\apache-maven-3.6.3\repository\io\springfox\springfox-swagger-common\2.6.1\springfox-swagger-common-2.6.1.jar;D:\apache-maven-3.6.3\repository\io\springfox\springfox-spring-web\2.6.1\springfox-spring-web-2.6.1.jar;D:\apache-maven-3.6.3\repository\com\google\guava\guava\18.0\guava-18.0.jar;D:\apache-maven-3.6.3\repository\com\fasterxml\classmate\1.5.0\classmate-1.5.0.jar;D:\apache-maven-3.6.3\repository\org\slf4j\slf4j-api\1.7.28\slf4j-api-1.7.28.jar;D:\apache-maven-3.6.3\repository\org\springframework\plugin\spring-plugin-core\1.2.0.RELEASE\spring-plugin-core-1.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\springframework\plugin\spring-plugin-metadata\1.2.0.RELEASE\spring-plugin-metadata-1.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\mapstruct\mapstruct\1.0.0.Final\mapstruct-1.0.0.Final.jar;D:\apache-maven-3.6.3\repository\io\springfox\springfox-swagger-ui\2.6.1\springfox-swagger-ui-2.6.1.jar;D:\apache-maven-3.6.3\repository\com\alibaba\fastjson\1.2.38\fastjson-1.2.38.jar;D:\apache-maven-3.6.3\repository\org\mybatis\spring\boot\mybatis-spring-boot-starter\1.3.2\mybatis-spring-boot-starter-1.3.2.jar;D:\apache-maven-3.6.3\repository\org\springframework\boot\spring-boot-starter-jdbc\2.2.0.RELEASE\spring-boot-starter-jdbc-2.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\com\zaxxer\HikariCP\3.4.1\HikariCP-3.4.1.jar;D:\apache-maven-3.6.3\repository\org\springframework\spring-jdbc\5.2.0.RELEASE\spring-jdbc-5.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\springframework\spring-tx\5.2.0.RELEASE\spring-tx-5.2.0.RELEASE.jar;D:\apache-maven-3.6.3\repository\org\mybatis\spring\boot\mybatis-spring-boot-autoconfigure\1.3.2\mybatis-spring-boot-autoconfigure-1.3.2.jar;D:\apache-maven-3.6.3\repository\org\mybatis\mybatis\3.4.6\mybatis-3.4.6.jar;D:\apache-maven-3.6.3\repository\org\mybatis\mybatis-spring\1.3.2\mybatis-spring-1.3.2.jar;D:\apache-maven-3.6.3\repository\mysql\mysql-connector-java\8.0.11\mysql-connector-java-8.0.11.jar;D:\apache-maven-3.6.3\repository\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;D:\apache-maven-3.6.3\repository\log4j\log4j\1.2.17\log4j-1.2.17.jar com.courses.Chapter13Application

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.2.0.RELEASE)

2020-07-19 22:46:11.736 [main] INFO  com.courses.Chapter13Application - Starting Chapter13Application on DESKTOP-JJQP1O8 with PID 27360 (F:\Git_Reporistory\AutoInterfaceTest\chapter13\target\classes started by motke in F:\Git_Reporistory\AutoInterfaceTest)
2020-07-19 22:46:11.738 [main] INFO  com.courses.Chapter13Application - No active profile set, falling back to default profiles: default
2020-07-19 22:46:12.496 [main] WARN  org.mybatis.spring.mapper.ClassPathMapperScanner - No MyBatis mapper was found in '[com.courses]' package. Please check your configuration.
2020-07-19 22:46:12.652 [main] INFO  o.s.context.support.PostProcessorRegistrationDelegate$BeanPostProcessorChecker - Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-07-19 22:46:12.806 [main] INFO  org.springframework.boot.web.embedded.tomcat.TomcatWebServer - Tomcat initialized with port(s): 8888 (http)
2020-07-19 22:46:12.812 [main] INFO  org.apache.catalina.core.StandardService - Starting service [Tomcat]
2020-07-19 22:46:12.812 [main] INFO  org.apache.catalina.core.StandardEngine - Starting Servlet engine: [Apache Tomcat/9.0.27]
2020-07-19 22:46:12.867 [main] INFO  org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/] - Initializing Spring embedded WebApplicationContext
2020-07-19 22:46:12.868 [main] INFO  org.springframework.web.context.ContextLoader - Root WebApplicationContext: initialization completed in 1094 ms
2020-07-19 22:46:13.163 [main] WARN  o.s.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'documentationPluginsBootstrapper' defined in URL [jar:file:/D:/apache-maven-3.6.3/repository/io/springfox/springfox-spring-web/2.6.1/springfox-spring-web-2.6.1.jar!/springfox/documentation/spring/web/plugins/DocumentationPluginsBootstrapper.class]: Unsatisfied dependency expressed through constructor parameter 1; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'webMvcRequestHandlerProvider' defined in URL [jar:file:/D:/apache-maven-3.6.3/repository/io/springfox/springfox-spring-web/2.6.1/springfox-spring-web-2.6.1.jar!/springfox/documentation/spring/web/plugins/WebMvcRequestHandlerProvider.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'userManager' method 
com.courses.controller.UserManager#addUser(HttpServletRequest, Users)
to {POST /v1}: There is already 'userManager' bean method
com.courses.controller.UserManager#login(HttpServletResponse, Users) mapped.
2020-07-19 22:46:13.164 [main] WARN  org.springframework.context.annotation.CommonAnnotationBeanPostProcessor - Destroy method on bean with name 'chapter13Application' threw an exception: java.lang.NullPointerException
2020-07-19 22:46:13.165 [main] INFO  org.apache.catalina.core.StandardService - Stopping service [Tomcat]
2020-07-19 22:46:13.173 [main] INFO  o.s.boot.autoconfigure.logging.ConditionEvaluationReportLoggingListener - 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-07-19 22:46:13.303 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'documentationPluginsBootstrapper' defined in URL [jar:file:/D:/apache-maven-3.6.3/repository/io/springfox/springfox-spring-web/2.6.1/springfox-spring-web-2.6.1.jar!/springfox/documentation/spring/web/plugins/DocumentationPluginsBootstrapper.class]: Unsatisfied dependency expressed through constructor parameter 1; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'webMvcRequestHandlerProvider' defined in URL [jar:file:/D:/apache-maven-3.6.3/repository/io/springfox/springfox-spring-web/2.6.1/springfox-spring-web-2.6.1.jar!/springfox/documentation/spring/web/plugins/WebMvcRequestHandlerProvider.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'userManager' method 
com.courses.controller.UserManager#addUser(HttpServletRequest, Users)
to {POST /v1}: There is already 'userManager' bean method
com.courses.controller.UserManager#login(HttpServletResponse, Users) mapped.
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:787)
	at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:226)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1358)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1204)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:879)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:878)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:141)
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
	at com.courses.Chapter13Application.main(Chapter13Application.java:16)
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'webMvcRequestHandlerProvider' defined in URL [jar:file:/D:/apache-maven-3.6.3/repository/io/springfox/springfox-spring-web/2.6.1/springfox-spring-web-2.6.1.jar!/springfox/documentation/spring/web/plugins/WebMvcRequestHandlerProvider.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'userManager' method 
com.courses.controller.UserManager#addUser(HttpServletRequest, Users)
to {POST /v1}: There is already 'userManager' bean method
com.courses.controller.UserManager#login(HttpServletResponse, Users) mapped.
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:787)
	at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:226)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1358)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1204)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1503)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1467)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveMultipleBeans(DefaultListableBeanFactory.java:1358)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1245)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207)
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:874)
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:778)
	... 19 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'userManager' method 
com.courses.controller.UserManager#addUser(HttpServletRequest, Users)
to {POST /v1}: There is already 'userManager' bean method
com.courses.controller.UserManager#login(HttpServletResponse, Users) mapped.
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1803)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:595)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517)
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
	at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.addCandidateEntry(DefaultListableBeanFactory.java:1503)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.findAutowireCandidates(DefaultListableBeanFactory.java:1467)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveMultipleBeans(DefaultListableBeanFactory.java:1358)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1245)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207)
	at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:874)
	at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:778)
	... 36 common frames omitted
Caused by: java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'userManager' method 
com.courses.controller.UserManager#addUser(HttpServletRequest, Users)
to {POST /v1}: There is already 'userManager' bean method
com.courses.controller.UserManager#login(HttpServletResponse, Users) mapped.
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.validateMethodMapping(AbstractHandlerMethodMapping.java:633)
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.register(AbstractHandlerMethodMapping.java:600)
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.registerHandlerMethod(AbstractHandlerMethodMapping.java:318)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.registerHandlerMethod(RequestMappingHandlerMapping.java:350)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.registerHandlerMethod(RequestMappingHandlerMapping.java:67)
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.lambda$detectHandlerMethods$1(AbstractHandlerMethodMapping.java:288)
	at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:684)
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.detectHandlerMethods(AbstractHandlerMethodMapping.java:286)
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.processCandidateBean(AbstractHandlerMethodMapping.java:258)
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:217)
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:205)
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:171)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1862)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1799)
	... 50 common frames omitted

Process finished with exit code 1

关键点

• 该方法出现了模糊映射，该类已经存在
• 推测
  • 可能在其他的控制层出现了相同的映射路径，导致报错信息（验证方式，通过全局搜索映射路径）
  • 如果上述方式仍然不能解决，需要检查@RequestMapping注解中的name和value，在注解中使用value,而非name!
    

@RequestMapping源码

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package org.springframework.web.bind.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.springframework.core.annotation.AliasFor;

@Target({
     ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Mapping
public @interface RequestMapping {
     
	// name属性，指定映射的名称，相当于方法的注释，使方法更易理解 
    String name() default "";
	// 指定请求路径的地址
    @AliasFor("path")
    String[] value() default {
     };
    @AliasFor("value")
    String[] path() default {
     };
	// 指定请求的方式，是一个RequsetMethod数组，可以配置多个方法
    RequestMethod[] method() default {
     };
	// 指定参数的类型
    String[] params() default {
     };
	// 指定请求中必须包含某些指定的header值，才能够让该方法处理请求
    String[] headers() default {
     };
	// 指定数据请求的格式，例如：application/json、text/html时，才能够让该方法处理请求
    String[] consumes() default {
     };
	// 指定返回的内容类型，返回的内容类型必须是request请求头（Accept）中所包含的类型
    String[] produces() default {
     };
}

总结

注意controller映射,勿出现重复映射方法
映射注解参数全部使用value,而非name

参考：
[1]Ambiguous mapping. Cannot map ‘XXXController’ method