Question

eclipse中无法启动tomcat

tomcat单独能运行，以前能运行的程序，现在报以下错误，求解？
严重: End event threw exception
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tomcat.util.IntrospectionUtils.callMethod1(IntrospectionUtils.java:804)
at org.apache.catalina.startup.SetNextNamingRule.end(SetNextNamingRule.java:104)
at org.apache.tomcat.util.digester.Digester.endElement(Digester.java:1057)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:601)
at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:180)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1339)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2747)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1543)
at org.apache.catalina.startup.Catalina.load(Catalina.java:554)
at org.apache.catalina.startup.Catalina.start(Catalina.java:608)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:304)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:432)
Caused by: java.lang.NullPointerException
at java.util.Hashtable.put(Hashtable.java:394)
at org.apache.catalina.deploy.NamingResources.addResource(NamingResources.java:324)
... 27 more
2011-6-1 8:10:15 org.apache.catalina.startup.Catalina load
警告: Catalina.start using conf/server.xml: Error at (126, 266) : null
2011-6-1 8:10:15 org.apache.catalina.startup.Catalina start
严重: Cannot start server. Server instance is not configured.

Answer 1

有几点疑惑: 1)你的tomcat是以前能运行，但现在启动不了了吗?
2)这些错误信息是在启动tomcat时报的，还是当运行某个程序时报的？
看了这个错误信息，我猜有几种可能性：
1）tomcat服务器崩溃了，这可能是经常会发生的问题，此时，就只好先删除服务器，再重新构建；
2）根据错误信息：Caused by: java.lang.NullPointerException，有可能是你的某个java类中出现了NullPointer；
根据你的实际情况，自己再重新调试调试吧，希望这些会对你有所帮助

Answer 2

在eclipse中不能显示小猫页面，但可以显示你的项目的主页。 eclipse是调用tomcat的接口模拟tomcat而不是真正启动它，因此会显示不了小猫页面。 eclipse的服务器

Answer 3

直接使用myEclipse吧