一直报错，导入不了怎么解决啊

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这个试了也没有用，要裂开了错误信息在下面


25-Nov-2021 05:47:52.551 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.catalina.core.ContainerBase.addChildInternal ContainerBase.addChild: start: 
    org.apache.catalina.LifecycleException: 无法启动组件[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/web_app_war]]
        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:755)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:729)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:695)
        at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1775)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:291)
        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:483)
        at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:431)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:291)
        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(AccessController.java:691)
        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:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
        at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
        at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:691)
        at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base/java.lang.Thread.run(Thread.java:831)
    Caused by: java.lang.IllegalArgumentException: servlet映射中的<url pattern>[demo01]无效
        at org.apache.catalina.core.StandardContext.addServletMappingDecoded(StandardContext.java:3211)
        at org.apache.catalina.core.StandardContext.addServletMappingDecoded(StandardContext.java:3196)
        at org.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1338)
        at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1115)
        at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:779)
        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:5130)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        ... 43 more
25-Nov-2021 05:47:52.555 严重 [RMI TCP Connection(3)-127.0.0.1] org.apache.tomcat.util.modeler.BaseModelMBean.invoke Exception invoking method manageApp
    java.lang.IllegalStateException: 启动子级时出错
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:729)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:695)
        at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1775)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:291)
        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:483)
        at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:431)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:291)
        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(AccessController.java:691)
        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:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
        at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
        at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:691)
        at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base/java.lang.Thread.run(Thread.java:831)
    Caused by: org.apache.catalina.LifecycleException: 无法启动组件[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/web_app_war]]
        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:755)
        ... 42 more
    Caused by: java.lang.IllegalArgumentException: servlet映射中的<url pattern>[demo01]无效
        at org.apache.catalina.core.StandardContext.addServletMappingDecoded(StandardContext.java:3211)
        at org.apache.catalina.core.StandardContext.addServletMappingDecoded(StandardContext.java:3196)
        at org.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1338)
        at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1115)
        at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:779)
        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:5130)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        ... 43 more
25-Nov-2021 05:47:52.559 严重 [RMI TCP Connection(3)-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:300)
        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:483)
        at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:431)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:291)
        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(AccessController.java:691)
        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:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357)
        at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
        at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:691)
        at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
        at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
        at java.base/java.lang.Thread.run(Thread.java:831)
    Caused by: java.lang.IllegalStateException: 启动子级时出错
        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:759)
        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:729)
        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:695)
        at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1775)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:291)
        ... 34 more
    Caused by: org.apache.catalina.LifecycleException: 无法启动组件[StandardEngine[Catalina].StandardHost[localhost].StandardContext[/web_app_war]]
        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:755)
        ... 42 more
    Caused by: java.lang.IllegalArgumentException: servlet映射中的<url pattern>[demo01]无效
        at org.apache.catalina.core.StandardContext.addServletMappingDecoded(StandardContext.java:3211)
        at org.apache.catalina.core.StandardContext.addServletMappingDecoded(StandardContext.java:3196)
        at org.apache.catalina.startup.ContextConfig.configureContext(ContextConfig.java:1338)
        at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1115)
        at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:779)
        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:5130)
        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
        ... 43 more

servlet映射中的[demo01]无效，是不是少了斜杆开头。

你的maven下载不下来，当然启动tomcat会报错了，很可能是你没有配置好你的本地maven或者你使用的是默认的maven，所以你要在网上下载maven3.6.0版本，然后再配置阿里镜像和本地仓库，配置好后将idea上面的maven和你本地的关联起来，然后再点击idea右侧的maven，点击第一个有clean按钮点击一下，然后再点击刷新的图标或者下载资源的图标，进行下载依赖，等待下载完成后，就不会爆红了