最近在自学Java，在用hibernate框架启动一个项目的时候报标题上的错误，百度各种方式尝试之后仍然没有解决，几乎崩溃，最后查到可能是因为servelet文件已添加注解，web.xml又重新配置了servlet，导致两个servlet发生冲突，最后经过尝试，已解决。真是豁然开朗。回想下当时的场景，当时在创建servlet文件时，它是自动添加注解的，这个时候就不需要在web.xml配置，新手没办法呀，只能硬生生的去找错误。下面把详细错误贴出来记录，也可以帮助到后期在遇到这个错误的萌新们。
十一月 27, 2018 10:34:31 上午 org.apache.tomcat.util.digester.SetPropertiesRule begin
警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:hibernate_crm' did not find a matching property.
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Server version: Apache Tomcat/7.0.90
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Server built: Jul 2 2018 17:05:37 UTC
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Server number: 7.0.90.0
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: OS Name: Windows 7
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: OS Version: 6.1
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Architecture: amd64
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Java Home: C:\Program Files\Java\jre1.8.0_181
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: JVM Version: 1.8.0_181-b13
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: JVM Vendor: Oracle Corporation
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: CATALINA_BASE: E:\GFworkspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: CATALINA_HOME: C:\Users\fj\Desktop\apache-tomcat-7.0.90
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Dcatalina.base=E:\GFworkspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Dcatalina.home=C:\Users\fj\Desktop\apache-tomcat-7.0.90
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Dwtp.deploy=E:\GFworkspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\wtpwebapps
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Djava.endorsed.dirs=C:\Users\fj\Desktop\apache-tomcat-7.0.90\endorsed
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Dfile.encoding=GBK
十一月 27, 2018 10:34:31 上午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent
信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files\Java\jre1.8.0_181\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jre1.8.0_181/bin/server;C:/Program Files/Java/jre1.8.0_181/bin;C:/Program Files/Java/jre1.8.0_181/lib/amd64;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Program Files\Java\jdk1.7.0_51\bin;C:\Program Files\Java\jdk1.7.0_51\jre\bin;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Program Files\VisualSVN Server\bin;C:\Program Files\TortoiseSVN\bin;D:\IDM Computer Solutions\UltraEdit;D:\My Sql\bin\bin;D:\My Sql\bin;C:\Users\fj\AppData\Local\Programs\Python\Python36-32\Scripts\;C:\Users\fj\AppData\Local\Programs\Python\Python36-32\;D:\eclipse官网版本;;.
十一月 27, 2018 10:34:31 上午 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["http-bio-8080"]
十一月 27, 2018 10:34:31 上午 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["ajp-bio-8009"]
十一月 27, 2018 10:34:31 上午 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 1402 ms
十一月 27, 2018 10:34:31 上午 org.apache.catalina.core.StandardService startInternal
信息: Starting service Catalina
十一月 27, 2018 10:34:31 上午 org.apache.catalina.core.StandardEngine startInternal
信息: Starting Servlet Engine: Apache Tomcat/7.0.90
十一月 27, 2018 10:34:36 上午 org.apache.catalina.startup.TldConfig execute
信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
十一月 27, 2018 10:34:36 上午 org.apache.catalina.core.ContainerBase startInternal
严重: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/hibernate_crm]]
at java.util.concurrent.FutureTask.report(Unknown Source)
at java.util.concurrent.FutureTask.get(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1241)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:819)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1702)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1692)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/hibernate_crm]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)
... 6 more
Caused by: java.lang.IllegalArgumentException: The servlets named [AddCustomerServlet] and [cn.itheima.web.AddCustomerServlet] are both mapped to the url-pattern [/AddCustomerServlet] which is not permitted
at org.apache.catalina.deploy.WebXml.addServletMapping(WebXml.java:293)
at org.apache.catalina.startup.ContextConfig.processAnnotationWebServlet(ContextConfig.java:2448)
at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2123)
at org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:2084)
at org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:2076)
at org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:2076)
at org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:2076)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1293)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:878)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:388)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5566)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
... 6 more
十一月 27, 2018 10:34:36 上午 org.apache.catalina.core.ContainerBase startInternal
严重: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
at java.util.concurrent.FutureTask.report(Unknown Source)
at java.util.concurrent.FutureTask.get(Unknown Source)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1241)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:300)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:444)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:758)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
at org.apache.catalina.startup.Catalina.start(Catalina.java:705)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:428)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1702)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1692)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1249)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:819)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
... 6 more
十一月 27, 2018 10:34:36 上午 org.apache.catalina.startup.Catalina start
严重: The required Server component failed to start so Tomcat is unable to start.
org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)
at org.apache.catalina.startup.Catalina.start(Catalina.java:705)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:294)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:428)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardService[Catalina]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:758)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
... 7 more
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:444)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
... 9 more
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:1249)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:300)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
... 11 more
十一月 27, 2018 10:34:36 上午 org.apache.coyote.AbstractProtocol pause
信息: Pausing ProtocolHandler ["http-bio-8080"]
十一月 27, 2018 10:34:36 上午 org.apache.coyote.AbstractProtocol pause
信息: Pausing ProtocolHandler ["ajp-bio-8009"]
十一月 27, 2018 10:34:36 上午 org.apache.catalina.core.StandardService stopInternal
信息: Stopping service Catalina
十一月 27, 2018 10:34:36 上午 org.apache.coyote.AbstractProtocol destroy
信息: Destroying ProtocolHandler ["http-bio-8080"]
十一月 27, 2018 10:34:36 上午 org.apache.coyote.AbstractProtocol destroy
信息: Destroying ProtocolHandler ["ajp-bio-8009"]