The servlets named [X] and [Y] are both mapped to the url-pattern [/Z] which is not permitted

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当我用myeclipse新建了一个servlet之后，重新运行tomcat，出现了如下错误

org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/task02_2]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1247)
at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1897)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
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: java.lang.IllegalArgumentException: The servlets named [UserServlet] and [servlet.UserServlet] are both mapped to the url-pattern [/UserServlet] which is not permitted
at org.apache.catalina.deploy.WebXml.addServletMapping(WebXml.java:293)
at org.apache.catalina.startup.ContextConfig.processAnnotationWebServlet(ContextConfig.java:2410)
at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2085)
at org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:2046)
at org.apache.catalina.startup.ContextConfig.processAnnotationsFile(ContextConfig.java:2039)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1304)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:889)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:386)
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:5380)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
... 10 more

观察错误原因，发现是存在相同的映射，但是web.xml文件里只有一个映射。网上查了之后发现原来是新建servlet时myeclipse在对应的servlet里加了@WebServlet("/UserServlet")注解 这样就不用在web.xml里配置servlet的映射路径了，否则就会出现以上错误。

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