Exception sending context initialized event to listener instance of class [org.springframework.web.context.ContextLoaderListener]

exception sending context initialized event to listener instance of class [org.springframework.web.context.contextloaderlistener]
org.springframework.beans.factory.beancreationexception: error creating bean with name 'citycontroller': injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.beancreationexception: could not autowire field: private com.formstest.service.icityservice com.formstest.controller.citycontroller.icityservice; nested exception is org.springframework.beans.factory.nosuchbeandefinitionexception: no qualifying bean of type [com.formstest.service.icityservice] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. dependency annotations: {@org.springframework.beans.factory.annotation.autowired(required=true)}
    at org.springframework.beans.factory.annotation.autowiredannotationbeanpostprocessor.postprocesspropertyvalues(autowiredannotationbeanpostprocessor.java:334)
    at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.populatebean(abstractautowirecapablebeanfactory.java:1202)
    at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.docreatebean(abstractautowirecapablebeanfactory.java:537)
    at org.springframework.beans.factory.support.abstractautowirecapablebeanfactory.createbean(abstractautowirecapablebeanfactory.java:476)
    at org.springframework.beans.factory.support.abstractbeanfactory$1.getobject(abstractbeanfactory.java:303)
    at org.springframework.beans.factory.support.defaultsingletonbeanregistry.getsingleton(defaultsingletonbeanregistry.java:230)
    at org.springframework.beans.factory.support.abstractbeanfactory.dogetbean(abstractbeanfactory.java:299)
    at org.springframework.beans.factory.support.abstractbeanfactory.getbean(abstractbeanfactory.java:194)
    at org.springframework.beans.factory.support.defaultlistablebeanfactory.preinstantiatesingletons(defaultlistablebeanfactory.java:762)
    at org.springframework.context.support.abstractapplicationcontext.finishbeanfactoryinitialization(abstractapplicationcontext.java:757)
    at org.springframework.context.support.abstractapplicationcontext.refresh(abstractapplicationcontext.java:480)
    at org.springframework.web.context.contextloader.configureandrefreshwebapplicationcontext(contextloader.java:403)
    at org.springframework.web.context.contextloader.initwebapplicationcontext(contextloader.java:306)
    at org.springframework.web.context.contextloaderlistener.contextinitialized(contextloaderlistener.java:106)
    at org.apache.catalina.core.standardcontext.listenerstart(standardcontext.java:4745)
    at org.apache.catalina.core.standardcontext.startinternal(standardcontext.java:5207)
    at org.apache.catalina.util.lifecyclebase.start(lifecyclebase.java:150)
    at org.apache.catalina.core.containerbase$startchild.call(containerbase.java:1419)
    at org.apache.catalina.core.containerbase$startchild.call(containerbase.java:1409)
    at java.util.concurrent.futuretask.run(futuretask.java:266)
    at java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1149)
    at java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:624)
    at java.lang.thread.run(thread.java:748)
caused by: org.springframework.beans.factory.beancreationexception: could not autowire field: private com.formstest.service.icityservice com.formstest.controller.citycontroller.icityservice; nested exception is org.springframework.beans.factory.nosuchbeandefinitionexception: no qualifying bean of type [com.formstest.service.icityservice] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. dependency annotations: {@org.springframework.beans.factory.annotation.autowired(required=true)}
    at org.springframework.beans.factory.annotation.autowiredannotationbeanpostprocessor$autowiredfieldelement.inject(autowiredannotationbeanpostprocessor.java:561)
    at org.springframework.beans.factory.annotation.injectionmetadata.inject(injectionmetadata.java:88)
    at org.springframework.beans.factory.annotation.autowiredannotationbeanpostprocessor.postprocesspropertyvalues(autowiredannotationbeanpostprocessor.java:331)
    ... 22 more
caused by: org.springframework.beans.factory.nosuchbeandefinitionexception: no qualifying bean of type [com.formstest.service.icityservice] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. dependency annotations: {@org.springframework.beans.factory.annotation.autowired(required=true)}
    at org.springframework.beans.factory.support.defaultlistablebeanfactory.raisenosuchbeandefinitionexception(defaultlistablebeanfactory.java:1308)
    at org.springframework.beans.factory.support.defaultlistablebeanfactory.doresolvedependency(defaultlistablebeanfactory.java:1054)
    at org.springframework.beans.factory.support.defaultlistablebeanfactory.resolvedependency(defaultlistablebeanfactory.java:949)
    at org.springframework.beans.factory.annotation.autowiredannotationbeanpostprocessor$autowiredfieldelement.inject(autowiredannotationbeanpostprocessor.java:533)
    ... 24 more


使用tomcat服务器启动项目的时候,报了error creating bean with name 'citycontroller': injection of autowired dependencies failed;
 nested exception is org.springframework.beans.factory.beancreationexception: could not autowire field: private com.formstest.service.icityservice com.formstest.controller.citycontroller.icityservice;
 nested exception is org.springframework.beans.factory.nosuchbeandefinitionexception: no qualifying bean of type [com.formstest.service.icityservice] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. dependency annotations: {@org.springframework.beans.factory.annotation.autowired(required=true)}
这样的问题之前也出现过,主要是因为在编写service实现类的时候忘记添加:implements 进行接口实现,从而导致无法创建bean:citycontroller