The servlets named [X] and [Y] are both mapped to the url-pattern [/Z] which is not permitted
2017-01-04 17:24
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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)
.........
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。
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)
.........
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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