在我们将 .WAR 文件放在 Tomcat 的 webapp 文件夹中后，就会发生此错误。然后我们尝试转到以下链接：
http://localhost:port/ProjectName/console
但是发生了 404 错误。当我们停止 Tomcat 服务器重新启动它时，我们无法再启动 Tomcat 服务器。出现以下情况显示：
Microsoft Windows [Version 6.3.9600]
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C:\Users\Administrator>"C:\Program Files\Apache Software Foundation\Tomcat 8.0\b
in\Tomcat8.exe"
11-Sep-2014 19:02:44.775 INFO [main] org.apache.catalina.core.AprLifecycleListen
er.init Loaded APR based Apache Tomcat Native library 1.1.31 using APR version 1
.4.8.
11-Sep-2014 19:02:44.779 INFO [main] org.apache.catalina.core.AprLifecycleListen
er.init APR capabilities: IPv6 [true], sendfile [true], accept filters [false],
random [true].
11-Sep-2014 19:02:45.201 SEVERE [main] org.apache.tomcat.util.digester.Digester.
startElement Begin event threw exception
java.lang.ClassNotFoundException: org.apache.catalina.loader.VirtualWebappLoade
r
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCreateRu
le.java:116)
at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1
184)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startEle
ment(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.
emptyElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l.scanStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(U
nknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(U
nknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(U
nknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown So
urce)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Un
known Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.p
arse(Unknown Source)
at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1457)
at org.apache.catalina.startup.Catalina.load(Catalina.java:551)
at org.apache.catalina.startup.Catalina.load(Catalina.java:599)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:310)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:484)
11-Sep-2014 19:02:45.217 WARNING [main] org.apache.catalina.startup.Catalina.loa
d Catalina.start using conf/server.xml: Error at (215, 187) : org.apache.catalin
a.loader.VirtualWebappLoader
11-Sep-2014 19:02:45.243 SEVERE [main] org.apache.tomcat.util.digester.Digester.
startElement Begin event threw exception
java.lang.ClassNotFoundException: org.apache.catalina.loader.VirtualWebappLoade
r
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.apache.tomcat.util.digester.ObjectCreateRule.begin(ObjectCreateRu
le.java:116)
at org.apache.tomcat.util.digester.Digester.startElement(Digester.java:1
184)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startEle
ment(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.
emptyElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l.scanStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(U
nknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(U
nknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(U
nknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown So
urce)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Un
known Source)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.p
arse(Unknown Source)
at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1457)
at org.apache.catalina.startup.Catalina.load(Catalina.java:551)
at org.apache.catalina.startup.Catalina.start(Catalina.java:613)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:351)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:485)
11-Sep-2014 19:02:45.258 WARNING [main] org.apache.catalina.startup.Catalina.loa
d Catalina.start using conf/server.xml: Error at (215, 187) : org.apache.catalin
a.loader.VirtualWebappLoader
11-Sep-2014 19:02:45.261 SEVERE [main] org.apache.catalina.startup.Catalina.star
t Cannot start server. Server instance is not configured.
C:\Users\Administrator>
我还注意到这一行错误：
11-Sep-2014 19:02:45.258 WARNING [main] org.apache.catalina.startup.Catalina.loa
d Catalina.start using conf/server.xml: Error at (215, 187) : org.apache.catalin
a.loader.VirtualWebappLoader
但是当我们检查文件是否丢失时，文件仍然存在。
我们错过了什么吗？
笔记：
- 工作灯服务器 6.2
- 阿帕奇雄猫 8
- MySQL 5.6