当我尝试在eclipse neon中启动tomcat 9.0时遇到此问题。
几天前我已经部署了一些简单的演示，tomcat可以运行良好。
但是这些天我遇到了这个问题，当我试图运行一个jsp页面或者只是试图在eclipse中启动tomcat时
而且，有几次，我可以重新启动tomcat并再次在服务器上运行jsp页面。但大部分时间我都无法成功运行tomcat
我无法弄清楚为什么会发生这种错误。我试图重新安装tomcat，但不工作:(。
我是javaweb的初学者，请帮我解决这个问题。
来自控制台的错误信息：
August 10, 2016 9:25:18 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:UserMVC02' did not find a matching property.
August 10, 2016 9:25:18 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
WARNING: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:JSPTags' did not find a matching property.
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server version: Apache Tomcat/9.0.0.M9
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server built: Jul 4 2016 18:22:47 UTC
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Server number: 9.0.0.0
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Name: Mac OS X
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: OS Version: 10.11.6
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Architecture: x86_64
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Java Home: /Library/Java/JavaVirtualMachines/jdk1.8.0_73.jdk/Contents/Home/jre
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Version: 1.8.0_73-b02
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: JVM Vendor: Oracle Corporation
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_BASE: /Users/chu/Documents/javaEEworkspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: CATALINA_HOME: /usr/local/tomcat
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.base=/Users/chu/Documents/javaEEworkspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dcatalina.home=/usr/local/tomcat
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dwtp.deploy=/Users/chu/Documents/javaEEworkspace/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Djava.endorsed.dirs=/usr/local/tomcat/endorsed
August 10, 2016 9:25:18 PM org.apache.catalina.startup.VersionLoggerListener log
INFO: Command line argument: -Dfile.encoding=UTF-8
August 10, 2016 9:25:18 PM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: /Users/chu/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.
August 10, 2016 9:25:18 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-nio-8080"]
August 10, 2016 9:25:18 PM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFO: Using a shared selector for servlet write/read
August 10, 2016 9:25:18 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["ajp-nio-8009"]
August 10, 2016 9:25:18 PM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFO: Using a shared selector for servlet write/read
August 10, 2016 9:25:18 PM org.apache.catalina.startup.Catalina load
INFO: Initialization processed in 912 ms
August 10, 2016 9:25:18 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service Catalina
August 10, 2016 9:25:18 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet Engine: Apache Tomcat/9.0.0.M9
August 10, 2016 9:25:19 PM org.apache.catalina.core.ContainerBase startInternal
severe: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/UserMVC02]]
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:911)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:890)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1403)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1393)
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[/UserMVC02]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:158)
... 6 more
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/beanutils/Converter
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2583)
at java.lang.Class.getDeclaredFields(Class.java:1916)
at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:110)
at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:262)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:136)
at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:66)
at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:327)
at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:774)
at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:298)
at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:94)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5075)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
... 6 more
Caused by: java.lang.ClassNotFoundException: org.apache.commons.beanutils.Converter
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1274)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1108)
... 19 more
August 10, 2016 9:25:19 PM org.apache.catalina.core.ContainerBase startInternal
severe: A child container failed during start
java.util.concurrent.ExecutionException: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost]]
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:911)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:791)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
at org.apache.catalina.startup.Catalina.start(Catalina.java:655)
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:497)
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 [StandardEngine[Catalina].StandardHost[localhost]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:158)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1403)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1393)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:920)
at org.apache.catalina.core.StandardHost.startInternal(StandardHost.java:890)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
... 6 more
August 10, 2016 9:25:19 PM org.apache.catalina.startup.Catalina start
severe: The required Server component failed to start so Tomcat is unable to start.
org.apache.catalina.LifecycleException: Failed to start component [StandardServer[8005]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:158)
at org.apache.catalina.startup.Catalina.start(Catalina.java:655)
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:497)
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 [StandardService[Catalina]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:158)
at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:791)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
... 7 more
Caused by: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina]]
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:158)
at org.apache.catalina.core.StandardService.startInternal(StandardService.java:422)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
... 9 more
Caused by: org.apache.catalina.LifecycleException: A child container failed during start
at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:920)
at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:152)
... 11 more
August 10, 2016 9:25:19 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["http-nio-8080"]
August 10, 2016 9:25:19 PM org.apache.coyote.AbstractProtocol pause
INFO: Pausing ProtocolHandler ["ajp-nio-8009"]
August 10, 2016 9:25:19 PM org.apache.catalina.core.StandardService stopInternal
INFO: Stopping service Catalina
August 10, 2016 9:25:19 PM org.apache.coyote.AbstractProtocol destroy
INFO: Destroying ProtocolHandler ["http-nio-8080"]
August 10, 2016 9:25:19 PM org.apache.coyote.AbstractProtocol destroy
INFO: Destroying ProtocolHandler ["ajp-nio-8009"]
答案 0 :(得分：0)
如果jar实际上不在WEB-INF/lib文件夹下，则需要在项目的部署程序集属性页中列出，否则根本不会部署它。