昨天搞了好久还是没有解决，今天把springaop小demo敲一遍时，启动tomcat时报错：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter#0' defined in class path resource [spring-servlet/spring-servlet.xml]: Cannot create inner bean 'util:list#16083d2' of type [org.springframework.beans.factory.config.ListFactoryBean] while setting bean property 'messageConverters'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'util:list#16083d2': Initialization of bean failed; nested exception is java.lang.NoClassDefFoundError: com/fasterxml/jackson/core/JsonProcessingException
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveInnerBean(BeanDefinitionValueResolver.java:313) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:122) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1486) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1231) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:751) ~[spring-beans-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:861) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:541) ~[spring-context-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:682) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:553) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:494) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136) ~[spring-webmvc-4.3.3.RELEASE.jar:4.3.3.RELEASE]
at javax.servlet.GenericServlet.init(GenericServlet.java:158) ~[servlet-api.jar:3.0.FR]
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1269) ~[catalina.jar:7.0.82]
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1182) ~[catalina.jar:7.0.82]
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1072) ~[catalina.jar:7.0.82]
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5362) ~[catalina.jar:7.0.82]
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5660) ~[catalina.jar:7.0.82]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145) ~[catalina.jar:7.0.82]
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1015) ~[catalina.jar:7.0.82]
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:991) ~[catalina.jar:7.0.82]
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652) ~[catalina.jar:7.0.82]
at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1899) ~[catalina.jar:7.0.82]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_152]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_152]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_152]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_152]
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) ~[tomcat-coyote.jar:7.0.82]
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) ~[?:1.8.0_152]
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) ~[?:1.8.0_152]
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618) ~[catalina.jar:7.0.82]
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565) ~[catalina.jar:7.0.82]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_152]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_152]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_152]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_152]
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) ~[tomcat-coyote.jar:7.0.82]
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) ~[?:1.8.0_152]
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) ~[?:1.8.0_152]
at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468) ~[?:1.8.0_152]
at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76) ~[?:1.8.0_152]
at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309) ~[?:1.8.0_152]
at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401) ~[?:1.8.0_152]
at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829) ~[?:1.8.0_152]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_152]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_152]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_152]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_152]
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357) ~[?:1.8.0_152]
at sun.rmi.transport.Transport$1.run(Transport.java:200) ~[?:1.8.0_152]
at sun.rmi.transport.Transport$1.run(Transport.java:197) ~[?:1.8.0_152]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_152]
at sun.rmi.transport.Transport.serviceCall(Transport.java:196) ~[?:1.8.0_152]
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568) ~[?:1.8.0_152]
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826) ~[?:1.8.0_152]
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683) ~[?:1.8.0_152]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_152]
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682) [?:1.8.0_152]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_152]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_152]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_152]
大概意思就是我少了springmvc的依赖jar包，但是我在pom.xml中已经加入依赖jar包了，也指定了版本号，后来发现我的idea模块(也就是空间)中存在两个版本，一个2.9一个2.6，我用到的就是2.6版本，不知道为什么加载不到这个类，然后报错，我用经理写的小demo就可以正常运行。网上搜了很多，都是说没有此依赖包。
网上的另一种说法就是上面的jar包都有了还报相同的错误，那就去你的本地库去把你所有相关的jar包删除重新使用maven下载，全部删除后再构建就可以运行了，结果试了还是不行。
所以我准备重新创建一个idea的工作空间，然后重新写一遍spriingaop_demo;