idea项目启动不了，报错war exploded: Artifact is being deployed, please wait...

今天创建了一个idea项目 ，结果启动不了，上网到处查资料，找问题。发现网上所有出现的问题，我的都没毛病。结合自己以前设置过的步骤检查了好几遍，都没问题。最后一个字符一个字符对比，才找到问题所在。
下面分享一下报错以及问题所在。
报错
Connected to server
[2019-09-28 10:49:00,848] Artifact ideaWork:war exploded: Artifact is being deployed, please wait…
28-Sep-2019 22:49:01.229 涓ラ噸 [RMI TCP Connection(2)-127.0.0.1] org.apache.tomcat.util.modeler.BaseModelMBean.invoke Exception invoking method [manageApp]
java.lang.IllegalStateException: Error starting child at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:720) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705)
at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1728)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:289)
at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:809)
at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:457)
at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:406)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:289)
at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:809)
at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)
at java.management/com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1466)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1307)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1406)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:827)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:359)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)atjava.base/java.security.AccessController.doPrivileged(NativeMethod)atjava.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)atjava.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:562)atjava.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:796)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:677)atjava.base/java.security.AccessController.doPrivileged(NativeMethod)atjava.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:676)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)atjava.base/java.lang.Thread.run(Thread.java:834)Causedby:org.apache.catalina.LifecycleException:Failedtostartcomponent[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/ideaWor{k}_{w}a{r}_{e}xploded]]atorg.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)atorg.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)atorg.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:717)...42moreCausedby:java.lang.IllegalArgumentException:Invalid<url-pattern>[Second]inservletmappingatorg.apache.catalina.core.StandardContext.addServletMappingDecoded(StandardContext.java:3178)atorg.apache.catalina.Context.addServletMappingDecoded(Context.java:881)atorg.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1392)atorg.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1169)atorg.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:775)atorg.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:301)atorg.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)atorg.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5051)atorg.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)...43more28-Sep-201922:49:01.236涓ラ噸[RMITCPConnection(2)-127.0.0.1]org.apache.tomcat.util.modeler.BaseModelMBean.invokeExceptioninvokingmethod[createStandardContext]javax.management.RuntimeOperationsException:Exceptioninvokingmethod[manageApp]atorg.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:298)atjava.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:809)atjava.management/com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)atorg.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:457)atorg.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:406)atjava.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)atjava.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)atjava.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)atjava.base/java.lang.reflect.Method.invoke(Method.java:566)atorg.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:289)atjava.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:809)atjava.management/com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)atjava.management/com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)atjava.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1466)atjava.management.rmi/javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1307)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1406)
at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:827)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:359)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)atjava.base/java.security.AccessController.doPrivileged(NativeMethod)atjava.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)atjava.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:562)atjava.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:796)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:677)atjava.base/java.security.AccessController.doPrivileged(NativeMethod)atjava.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:676)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalStateException: Error starting child
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:720)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:690)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:705)
at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1728)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:289)
… 34 more
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/ideaWork_war_exploded]]
at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:440)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:717)
… 42 more
Caused by: java.lang.IllegalArgumentException: Invalid [Second] in servlet mapping
at org.apache.catalina.core.StandardContext.addServletMappingDecoded(StandardContext.java:3178)
at org.apache.catalina.Context.addServletMappingDecoded(Context.java:881)
at org.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1392)
at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1169)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:775)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:301)
[2019-09-28 10:49:01,277] Artifact ideaWork:war exploded: Error during artifact deployment. See server log for details.
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5051)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
… 43 more
28-Sep-2019 22:49:10.662 淇℃伅 [Catalina-utility-1] org.apache.catalina.startup.HostConfig.deployDirectory 鎶妛eb 搴旂敤绋嬪簭閮ㄧ讲鍒扮洰褰� [D:\tomcat\webapps\manager]
28-Sep-2019 22:49:11.005 淇℃伅 [Catalina-utility-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [D:\tomcat\webapps\manager] has finished in [342] ms
解决方法如下：
下图箭头所指的地方改成/Second。也就是Second之前加个/

这么小的一个失误，导致了后面运行不了。浪费了大半天时间一直在找问题所在。不要看一个小符号、小问题 。小问题往往造成大失误。希望吸取教训，共勉之。