这篇文章主要介绍Spring定时任务中@PostConstruct被多次执行异常的示例分析，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
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发现问题
最近在项目中刚刚修改一个功能，代码正准备验证，启动Idea的debug模式，运行项目，发现启动失败，查看日志发现定时任务被重复执行，导致异常。debug定时任务的初始化类，发现启动定时任务是在@PostConstruct方法中执行的，网上查询，有说Spring在某种情况下初始化有bug，注解@Component可能出现多次执行。把@Component修改为@Service就行了！
结果我改了也没解决问题！
无赖更一步跟进日志，发现以下内容：
[ERROR][2017-06-20 19:50:16] - [org.springframework.web.servlet.DispatcherServlet] - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'requestMappingHandlerMapping' defined in class org.springframework.web.servlet.config.annotation.DelegatingWebMvcConfiguration: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping found. Cannot map 'galleryController' bean method
public com.test.model.domain.response.Result com.test.model.back.controller.GalleryController.removeRecord(java.lang.Integer)
to {[/gallery/removeRecord],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}: There is already 'galleryController' bean method
public java.lang.String com.test.model.back.controller.GalleryController.removeRecord(java.lang.Integer,org.springframework.ui.ModelMap) mapped.
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1574) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480) ~[spring-context-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:663) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:535) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:489) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) [spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at javax.servlet.GenericServlet.init(GenericServlet.java:158) [servlet-api.jar:3.0.FR]
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1282) [catalina.jar:7.0.70]
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1088) [catalina.jar:7.0.70]
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5349) [catalina.jar:7.0.70]
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5641) [catalina.jar:7.0.70]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) [catalina.jar:7.0.70]
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899) [catalina.jar:7.0.70]
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875) [catalina.jar:7.0.70]
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652) [catalina.jar:7.0.70]
at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1863) [catalina.jar:7.0.70]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_79]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_79]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_79]
at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_79]
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) [tomcat-coyote.jar:7.0.70]
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) [na:1.7.0_79]
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) [na:1.7.0_79]
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618) [catalina.jar:7.0.70]
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565) [catalina.jar:7.0.70]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_79]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_79]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_79]
at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_79]
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) [tomcat-coyote.jar:7.0.70]
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) [na:1.7.0_79]
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) [na:1.7.0_79]
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1487) [na:1.7.0_79]
at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:97) [na:1.7.0_79]
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1328) [na:1.7.0_79]
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1420) [na:1.7.0_79]
at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:848) [na:1.7.0_79]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.7.0_79]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[na:1.7.0_79]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.7.0_79]
at java.lang.reflect.Method.invoke(Method.java:606) ~[na:1.7.0_79]
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322) [na:1.7.0_79]
at sun.rmi.transport.Transport$2.run(Transport.java:202) [na:1.7.0_79]
at sun.rmi.transport.Transport$2.run(Transport.java:199) [na:1.7.0_79]
at java.security.AccessController.doPrivileged(Native Method) [na:1.7.0_79]
at sun.rmi.transport.Transport.serviceCall(Transport.java:198) [na:1.7.0_79]
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:567) [na:1.7.0_79]
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828) [na:1.7.0_79]
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.access$400(TCPTransport.java:619) [na:1.7.0_79]
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:684) [na:1.7.0_79]
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:681) [na:1.7.0_79]
at java.security.AccessController.doPrivileged(Native Method) [na:1.7.0_79]
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:681) [na:1.7.0_79]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_79]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_79]
at java.lang.Thread.run(Thread.java:745) [na:1.7.0_79]
Caused by: java.lang.IllegalStateException: Ambiguous mapping found. Cannot map 'galleryController' bean method
public com.test.model.domain.response.Result com.test.model.back.controller.GalleryController.removeRecord(java.lang.Integer)
to {[/gallery/removeRecord],methods=[],params=[],headers=[],consumes=[],produces=[],custom=[]}: There is already 'galleryController' bean method
public java.lang.String com.test.model.back.controller.GalleryController.removeRecord(java.lang.Integer,org.springframework.ui.ModelMap) mapped.
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.registerHandlerMethod(AbstractHandlerMethodMapping.java:212) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.detectHandlerMethods(AbstractHandlerMethodMapping.java:184) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:144) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:123) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:126) ~[spring-webmvc-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1633) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1570) ~[spring-beans-4.1.6.RELEASE.jar:4.1.6.RELEASE]
... 63 common frames omitted
[2017-06-20 07:50:16,467] Artifact back:war exploded: Artifact is deployed successfully
[2017-06-20 07:50:16,467] Artifact back:war exploded: Deploy took 6,867 milliseconds解决方法：
原来，由于定时任务异常比较多，忽略了最开始的异常内容，发现程序异常后自己重新又启动了，而这个异常是GalleryController这个控制器中@RequestMapping配置重复导致的。springMVC中不允许有重复@RequestMapping，刚刚修改的方法中忘记修改@RequestMapping中的地址，所以报错，而Idea发现异常后会自动重启Tomcat容器，结果就是无限循环，异常日志太多，看不过来，异常排查的方向不对导致！
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