servlet错误①
写Servlet时为了方便，我就复制 了一个Servlet，只改了逻辑但是运行时就出现了如下
Tomcat无法启动的情况：
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[/mysql_crud]]
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:1119)
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$StartChild.call(ContainerBase.java:1571)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1561)
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[/mysql_crud]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)
... 6 more
Caused by: java.lang.IllegalArgumentException: The servlets named [cn.iponkan.service.AddServlet] and [cn.iponkan.service.UpdateServlet] are both mapped to the url-pattern [/UpdateServlet] which is not permitted
at org.apache.catalina.deploy.WebXml.addServletMapping(WebXml.java:293)
原因是：我这个地方没改，更改为当前Servlet名称后问题成功解决。