根据书上的需求写了一些简单的servlet代码，启动时报错：

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[/testagain]]
 at java.util.concurrent.FutureTask.report(FutureTask.java:122)
 at java.util.concurrent.FutureTask.get(FutureTask.java:192)
 at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:916)
 at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:868)
 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1408)
 at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1398)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
 at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/testagain]]
 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
 ... 6 more
Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> listbookservlet in servlet mapping
 at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3150)
 at org.apache.catalina.core.StandardContext.addServletMapping(StandardContext.java:3125)
 at org.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1372)
 at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1176)
 at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:771)
 at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:305)
 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:5120)
 at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
 ... 6 more

发现其中Caused by: java.lang.IllegalArgumentException: Invalid <url-pattern> listbookservlet in servlet mapping

说明servlet映射的url-pattern有问题。

我是用注解的方式写的servlet映射,应该将@WebServlet("cartservlet")写成@WebServlet("/cartservlet")，

这样问题就解决了。

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