java报错大全java.lang.IllegalStateException: Ambiguous mapping Cannot map xxx

报错信息

2020-06-28 16:52:30.280 ERROR 12216 --- [           main] o.s.boot.SpringApplication               : Application startup failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'scheduledController' method 
public void com.atguigu.task.controller.ScheduledController.hello()
to {[/hello],methods=[GET]}: There is already 'asyncController' bean method
public java.lang.String com.atguigu.task.controller.AsyncController.hello() mapped.
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1630) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:867) ~[spring-context-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.12.RELEASE.jar:1.5.12.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.12.RELEASE.jar:1.5.12.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.12.RELEASE.jar:1.5.12.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.12.RELEASE.jar:1.5.12.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.12.RELEASE.jar:1.5.12.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.12.RELEASE.jar:1.5.12.RELEASE]
	at com.atguigu.task.Springboot04TaskApplication.main(Springboot04TaskApplication.java:14) [classes/:na]
Caused by: java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'scheduledController' method 
public void com.atguigu.task.controller.ScheduledController.hello()
to {[/hello],methods=[GET]}: There is already 'asyncController' bean method
public java.lang.String com.atguigu.task.controller.AsyncController.hello() mapped.
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.assertUniqueMethodMapping(AbstractHandlerMethodMapping.java:576) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$MappingRegistry.register(AbstractHandlerMethodMapping.java:540) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.registerHandlerMethod(AbstractHandlerMethodMapping.java:264) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.detectHandlerMethods(AbstractHandlerMethodMapping.java:250) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:214) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:184) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:127) ~[spring-webmvc-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1688) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1626) ~[spring-beans-4.3.16.RELEASE.jar:4.3.16.RELEASE]
	... 16 common frames omitted

报错分析

注意：
public void com.atguigu.task.controller.ScheduledController.hello() to
{[/hello],methods=[GET]}: There is already ‘asyncController’ bean
method public java.lang.String
com.atguigu.task.controller.AsyncController.hello() mapped

这里已经说的很清楚了是/hello已经在 ‘asyncController’ 中存在，这里重复了。

尝试更改

    @GetMapping("/hello1")
    public void hello(){
        scheduledService.hello();
    }

> 将/hello改为其他，如/hello1即可