项目 ： 普通的Maven Java Web 项目
操作记录：
使用 Maven 构建项目，指令 tomcat7:run 无异常
但使用 eclipse 的 tomcat 运行项目，报此异常。
后面从tomcat删除了此项目，重新运行则不报错了。
不明白原因，记录。
异常全文：
十二月 27, 2017 10:59:07 下午 org.apache.tomcat.util.digester.SetPropertiesRule begin
警告: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:MyTest' did not find a matching property.
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Server version: Apache Tomcat/9.0.1
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Server built: Sep 27 2017 17:31:52 UTC
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Server number: 9.0.1.0
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: OS Name: Windows 10
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: OS Version: 10.0
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Architecture: amd64
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Java Home: C:Program FilesJavajdk1.8.0_111jre
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: JVM Version: 1.8.0_111-b14
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: JVM Vendor: Oracle Corporation
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: CATALINA_BASE: D:workspacesssm_basic.metadata.pluginsorg.eclipse.wst.server.core mp0
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: CATALINA_HOME: D: omcatServerapache-tomcat-9.0.1apache-tomcat-9.0.1
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -agentlib:jdwp=transport=dt_socket,suspend=y,address=localhost:7001
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Dcatalina.base=D:workspacesssm_basic.metadata.pluginsorg.eclipse.wst.server.core mp0
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Dcatalina.home=D: omcatServerapache-tomcat-9.0.1apache-tomcat-9.0.1
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Dwtp.deploy=D:workspacesssm_basic.metadata.pluginsorg.eclipse.wst.server.core mp0wtpwebapps
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Djava.endorsed.dirs=D: omcatServerapache-tomcat-9.0.1apache-tomcat-9.0.1endorsed
十二月 27, 2017 10:59:07 下午 org.apache.catalina.startup.VersionLoggerListener log
信息: Command line argument: -Dfile.encoding=UTF-8
十二月 27, 2017 10:59:07 下午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent
信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:Program FilesJavajdk1.8.0_111in;C:WindowsSunJavain;C:Windowssystem32;C:Windows;C:Program FilesJavajdk1.8.0_111jrein;C:/Program Files/Java/jdk1.8.0_111/bin/../jre/bin/server;C:/Program Files/Java/jdk1.8.0_111/bin/../jre/bin;C:/Program Files/Java/jdk1.8.0_111/bin/../jre/lib/amd64;C:Program Files (x86)Graphviz2.38in;C:Program Files (x86)Common FilesIntelShared FilescppinIntel64;C:Program FilesJavajdk1.8.0_111in;C:Program Files (x86)NVIDIA CorporationPhysXCommon;C:ProgramDataOracleJavajavapath;C:Windowssystem32;C:Windows;C:WindowsSystem32Wbem;C:WindowsSystem32WindowsPowerShellv1.0;D:myboxmypath;D:myboxmysqlmysql-5.7.18-winx64mysql-5.7.18-winx64in;C:Program FilesTortoiseSVNin;C:Program FilesGitcmd;C:Program FilesMacType;D:mavenapache-maven-3.5.0in;C:UsersAdministratorAppDataLocalMicrosoftWindowsApps;C:Program FilesBandizip;D:eclipseIDEeclipse-jee-oxygen-1a-win32-x86_64eclipse;;.]
十二月 27, 2017 10:59:08 下午 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["http-nio-8093"]
十二月 27, 2017 10:59:08 下午 org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
信息: Using a shared selector for servlet write/read
十二月 27, 2017 10:59:08 下午 org.apache.coyote.AbstractProtocol init
信息: Initializing ProtocolHandler ["ajp-nio-8009"]
十二月 27, 2017 10:59:08 下午 org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
信息: Using a shared selector for servlet write/read
十二月 27, 2017 10:59:08 下午 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 2051 ms
十二月 27, 2017 10:59:08 下午 org.apache.catalina.core.StandardService startInternal
信息: Starting service [Catalina]
十二月 27, 2017 10:59:08 下午 org.apache.catalina.core.StandardEngine startInternal
信息: Starting Servlet Engine: Apache Tomcat/9.0.1
十二月 27, 2017 10:59:16 下午 org.apache.jasper.servlet.TldScanner scanJars
信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
十二月 27, 2017 10:59:16 下午 org.apache.catalina.core.ContainerBase startInternal
严重: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [org.apache.catalina.webresources.StandardRoot@31ecd003]
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:947)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:839)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1425)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1415)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:941)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:258)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:770)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:671)
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.catalina.startup.Bootstrap.start(Bootstrap.java:355)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)
Caused by: org.apache.catalina.LifecycleException: Failed to start component [org.apache.catalina.webresources.StandardRoot@31ecd003]
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.StandardContext.resourcesStart(StandardContext.java:4758)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:4893)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1425)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1415)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:941)
... 21 more
Caused by: java.lang.IllegalArgumentException: The main resource set specified [D:workspacesssm_basic.metadata.pluginsorg.eclipse.wst.server.core mp0wtpwebappsMyTest] is not valid
at org.apache.catalina.webresources.StandardRoot.createMainResourceSet(StandardRoot.java:749)
at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:706)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
... 30 more
十二月 27, 2017 10:59:16 下午 org.apache.catalina.core.ContainerBase startInternal
严重: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: A child container failed during start
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:947)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:258)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:770)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:671)
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.catalina.startup.Bootstrap.start(Bootstrap.java:355)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:956)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:839)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1425)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1415)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at org.apache.tomcat.util.threads.InlineExecutorService.execute(InlineExecutorService.java:75)
at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:134)
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:941)
... 13 more
十二月 27, 2017 10:59:16 下午 org.apache.catalina.startup.Catalina start
严重: The required Server component failed to start so Tomcat is unable to start.
org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:956)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:258)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:770)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
at org.apache.catalina.startup.Catalina.start(Catalina.java:671)
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.catalina.startup.Bootstrap.start(Bootstrap.java:355)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:495)
十二月 27, 2017 10:59:16 下午 org.apache.coyote.AbstractProtocol pause
信息: Pausing ProtocolHandler ["http-nio-8093"]
十二月 27, 2017 10:59:16 下午 org.apache.coyote.AbstractProtocol pause
信息: Pausing ProtocolHandler ["ajp-nio-8009"]
十二月 27, 2017 10:59:16 下午 org.apache.catalina.core.StandardService stopInternal
信息: Stopping service [Catalina]
十二月 27, 2017 10:59:16 下午 org.apache.coyote.AbstractProtocol destroy
信息: Destroying ProtocolHandler ["http-nio-8093"]
十二月 27, 2017 10:59:16 下午 org.apache.coyote.AbstractProtocol destroy
信息: Destroying ProtocolHandler ["ajp-nio-8009"]