先看具体错误日志：

[2019-04-26 09:29:25,484] Artifact demo-servlet:war: Artifact is being deployed, please wait...

26-Apr-2019 09:29:26.028 严重 [RMI TCP Connection(4)-127.0.0.1] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start:

 org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]

    at org.apache.catalina.util.LifecycleBase.handleSubClassException(LifecycleBase.java:441)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:198)

    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:740)

    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:716)

    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:703)

    at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1729)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:287)

    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)

    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)

    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:456)

    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:405)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:287)

    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)

    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)

    at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)

    at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)

    at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)

    at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)

    at java.security.AccessController.doPrivileged(Native Method)

    at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408)

    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)

    at sun.rmi.transport.Transport$1.run(Transport.java:200)

    at sun.rmi.transport.Transport$1.run(Transport.java:197)

    at java.security.AccessController.doPrivileged(Native Method)

    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)

    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)

    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)

    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)

    at java.security.AccessController.doPrivileged(Native Method)

    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)

    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: java.lang.IllegalArgumentException: The servlets named [DemoServlet] and [main.java.com.wlf.demo.servlet.DemoServlet] are both mapped to the url-pattern [/hello] which is not permitted

    at org.apache.tomcat.util.descriptor.web.WebXml.addServletMappingDecoded(WebXml.java:328)

    at org.apache.tomcat.util.descriptor.web.WebXml.addServletMapping(WebXml.java:321)

    at org.apache.catalina.startup.ContextConfig.processAnnotationWebServlet(ContextConfig.java:2428)

    at org.apache.catalina.startup.ContextConfig.processAnnotationsStream(ContextConfig.java:2105)

    at org.apache.catalina.startup.ContextConfig.processAnnotationsWebResource(ContextConfig.java:1991)

    at org.apache.catalina.startup.ContextConfig.processAnnotationsWebResource(ContextConfig.java:1985)

    at org.apache.catalina.startup.ContextConfig.processAnnotationsWebResource(ContextConfig.java:1985)

    at org.apache.catalina.startup.ContextConfig.processAnnotationsWebResource(ContextConfig.java:1985)

    at org.apache.catalina.startup.ContextConfig.processAnnotationsWebResource(ContextConfig.java:1985)

    at org.apache.catalina.startup.ContextConfig.processAnnotationsWebResource(ContextConfig.java:1985)

    at org.apache.catalina.startup.ContextConfig.processAnnotationsWebResource(ContextConfig.java:1985)

    at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1156)

    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:775)

    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:299)

    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:123)

    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5003)

    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)

    ... 44 more

26-Apr-2019 09:29:26.038 严重 [RMI TCP Connection(4)-127.0.0.1] org.apache.tomcat.util.modeler.BaseModelMBean.invoke Exception invoking method manageApp

 java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]

    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:744)

    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:716)

    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:703)

[2019-04-26 09:29:26,082] Artifact demo-servlet:war: Error during artifact deployment. See server log for details.

    at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1729)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:287)

    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)

    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)

    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:456)

    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:405)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:287)

    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)

    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)

    at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)

    at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)

    at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)

    at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)

    at java.security.AccessController.doPrivileged(Native Method)

    at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408)

    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)

    at sun.rmi.transport.Transport$1.run(Transport.java:200)

    at sun.rmi.transport.Transport$1.run(Transport.java:197)

    at java.security.AccessController.doPrivileged(Native Method)

    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)

    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)

    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)

    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)

    at java.security.AccessController.doPrivileged(Native Method)

    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)

    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)

26-Apr-2019 09:29:26.040 严重 [RMI TCP Connection(4)-127.0.0.1] org.apache.tomcat.util.modeler.BaseModelMBean.invoke Exception invoking method createStandardContext

 javax.management.RuntimeOperationsException: Exception invoking method manageApp

    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:295)

    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)

    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)

    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:456)

    at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:405)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:287)

    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819)

    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801)

    at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468)

    at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468)

    at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)

    at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)

    at java.security.AccessController.doPrivileged(Native Method)

    at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1408)

    at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)

    at sun.rmi.transport.Transport$1.run(Transport.java:200)

    at sun.rmi.transport.Transport$1.run(Transport.java:197)

    at java.security.AccessController.doPrivileged(Native Method)

    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)

    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)

    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)

    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)

    at java.security.AccessController.doPrivileged(Native Method)

    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)

    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: java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]

    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:744)

    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:716)

    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:703)

    at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1729)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

    at java.lang.reflect.Method.invoke(Method.java:498)

    at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:287)

    ... 35 more

26-Apr-2019 09:29:35.178 信息 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory [D:\Dev\apache-tomcat-9.0.0.M26\webapps\manager]

26-Apr-2019 09:29:35.413 信息 [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory [D:\Dev\apache-tomcat-9.0.0.M26\webapps\manager] has finished in [234] ms

　　日志里报错的地方不少，但其实关键的就标黄那里。我们知道日志堆栈需要反着看，标黄处是异常抛出来的地方，下面才是开始依次执行逻辑的步骤，这里大概说下：启动tomcat时会解析注解WebServlet，去添加Servlet的映射，但这时它发现已经存在该Servlet的配置了，抛出了异常。webXml类的添加Servlet映射方法的代码如下：

    public void addServletMappingDecoded(String urlPattern, String servletName) {

        String oldServletName = servletMappings.put(urlPattern, servletName);

        if (oldServletName != null) {

            // Duplicate mapping. As per clarification from the Servlet EG,

            // deployment should fail.

            throw new IllegalArgumentException(sm.getString(

                    "webXml.duplicateServletMapping", oldServletName,

                    servletName, urlPattern));

        }

        servletMappingNames.add(servletName);

    }

　　因为从web.xml中已经put进servletMapping了，所以从@WebServlet中再put进去发现了相同servlet配置，抛出重复servlet映射错误。@WebServlet或者web.xml中去掉一个就可以了。

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