java无法在Tomcat 7（org.apache.catalina.LifecycleeException）上部署YouTrack

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我正在安装YouTrack。我安装了Tomcat 7，工作正常（我可以加载localhost:8080）。现在我正在尝试部署YouTrack。我遵循了他们网站上的说明：

Deploy youtrack-xx.war in Tomcat servlet container:

If you run Tomcat (e.g. as a Windows service), stop Tomcat instance before deploying YouTrack.

Save youtrack-xx.war in the $TOMCAT_HOME$/webapps directory. Rename youtrack-xx.war file as required before deploying. In the further examples we assume that the YouTrack servlet name is set to youtrack.war.

Start Apache Tomcat and check whether YouTrack is set up correctly and is available (in a web browser navigate to http://yourserver:<Tomcat port>/youtrack).

在第3步。我无法访问YouTrack。我有404。如果我去Tomcat的管理网站，它会说YouTrack的运行状态是错误的。如果单击开始，它将显示以下错误消息：

FAIL - Application at context path /youtrack could not be started
FAIL - Encountered exception org.apache.catalina.LifecycleException: 
       Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/youtrack]]

我查看了logs/catalina.out，这是完整的错误：

Information: Deploying web application directory /usr/local/apache-tomcat-7.0.50/webapps/youtrack
Feb 02, 2014 3:19:26 PM org.apache.catalina.core.ContainerBase addChildInternal
Schwerwiegend: ContainerBase.addChild: start: 
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/youtrack]]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:154)
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:634)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1230)
    at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1876)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/xml/DOMConfigurator
    at java.lang.Class.getDeclaredFields0(Native Method)
    at java.lang.Class.privateGetDeclaredFields(Class.java:2397)
    at java.lang.Class.getDeclaredFields(Class.java:1806)
    at org.apache.catalina.util.Introspection.getDeclaredFields(Introspection.java:106)
    at org.apache.catalina.startup.WebAnnotationSet.loadFieldsAnnotation(WebAnnotationSet.java:263)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationServletAnnotations(WebAnnotationSet.java:142)
    at org.apache.catalina.startup.WebAnnotationSet.loadApplicationAnnotations(WebAnnotationSet.java:67)
    at org.apache.catalina.startup.ContextConfig.applicationAnnotationsConfig(ContextConfig.java:407)
    at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:883)
    at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:378)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5343)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    ... 10 more
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.xml.DOMConfigurator
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
    ... 24 more

Feb 02, 2014 3:19:26 PM org.apache.catalina.startup.HostConfig deployDirectory
Schwerwiegend: Error deploying web application directory /usr/local/apache-tomcat-7.0.50/webapps/youtrack
java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/youtrack]]
    at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:904)
    at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)
    at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:634)
    at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1230)
    at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1876)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
    at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:744)

看起来有些类丢失了，但错误中引用的类确实存在：

$TOMCAT$/webapps/youtrack/org/apache/log4j/xml

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java无法在Tomcat 7（org.apache.catalina.LifecycleeException）上部署YouTrack

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