自己模仿別人搭建了一個多模塊專案，剛開始寫。第一個功能登錄，然后啟動專案，正常。然后測驗登錄功能，就報錯：
[ERROR] 2020-02-11 12:36:49,539 org.springframework.web.servlet.DispatcherServlet - Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping': Invocation of init method failed; nested exception is java.lang.NoSuchMethodError: org.springframework.core.annotation.AnnotatedElementUtils.findMergedAnnotation(Ljava/lang/reflect/AnnotatedElement;Ljava/lang/Class;)Ljava/lang/annotation/Annotation;
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1572)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:539)
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:755)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:762)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:668)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:634)
at org.springframework.web.servlet.
Caused by: java.lang.NoSuchMethodError: org.springframework.core.annotation.AnnotatedElementUtils.findMergedAnnotation(Ljava/lang/reflect/AnnotatedElement;Ljava/lang/Class;)Ljava/lang/annotation/Annotation;
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.createRequestMappingInfo(RequestMappingHandlerMapping.java:203)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.getMappingForMethod(RequestMappingHandlerMapping.java:185)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.getMappingForMethod(RequestMappingHandlerMapping.java:53)
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping$1.inspect(AbstractHandlerMethodMapping.java:218)
at org.springframework.core.MethodIntrospector$1.doWith(MethodIntrospector.java:72)
at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:493)
at org.springframework.core.MethodIntrospector.selectMethods(MethodIntrospector.java:68)
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.detectHandlerMethods(AbstractHandlerMethodMapping.java:214)
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.initHandlerMethods(AbstractHandlerMethodMapping.java:191)
at org.springframework.web.servlet.handler.AbstractHandlerMethodMapping.afterPropertiesSet(AbstractHandlerMethodMapping.java:161)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping.afterPropertiesSet(RequestMappingHandlerMapping.java:125)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1631)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1568)
... 36 more
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然后我查網上的解決辦法，靠譜的基本都是說依賴少了，或者重復了，沖突了。我是模仿別人的，大部分東西是一樣的，但是pom檔案我是用我自己以前寫的專案的，然后加了點沒有的。我就比對兩個pom檔案的不同，把我多的依賴都注釋掉了。也嘗試了網上說的很多其他的辦法，總之都不好使。
最后，我想著問題最有可能出再pom上，我就先把pom檔案換成別人的，然后運行，就好使了，artifactId都沒改成我的。我看了他們的依賴，子工程的依賴還是原來的，總工程的換了。然后我改了artifactId，依然好使，依賴依然沒變。然后我又換成原來的pom檔案，依然好使！重啟idea，再次運行，依然好使！！！
哎，這就奇了怪了，這不就相當于我的pom檔案沒變嗎，換成別的再換回來就好使了，那原來為什么不好使？！真是氣炸我了。莫名其妙的。太糟心了，這搞得我一天都沒心思干別的。
如果有大佬知道其中緣由，煩請告知。謝謝。
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