在JBuilder9下配置Tomcat5.0运行不了，报了如下错误？

Catalina.start: java.lang.ClassNotFoundException: org.apache.coyote.tomcat4.CoyoteConnector
java.lang.ClassNotFoundException: org.apache.coyote.tomcat4.CoyoteConnector
at org.apache.commons.digester.Digester.createSAXException(Digester.java:2540)
at org.apache.commons.digester.Digester.createSAXException(Digester.java:2566)
at org.apache.commons.digester.Digester.startElement(Digester.java:1276)
at org.apache.catalina.util.CatalinaDigester.startElement(CatalinaDigester.java:112)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.commons.digester.Digester.parse(Digester.java:1548)
at org.apache.catalina.startup.Catalina.load(Catalina.java:515)
at org.apache.catalina.startup.Catalina.load(Catalina.java:553)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:260)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:397)
2004-6-16 15:25:07 org.apache.commons.digester.Digester startElement
严重: Begin event threw exception
java.lang.ClassNotFoundException: org.apache.coyote.tomcat4.CoyoteConnector
at org.apache.catalina.loader.StandardClassLoader.loadClass(StandardClassLoader.java:891)
at org.apache.catalina.loader.StandardClassLoader.loadClass(StandardClassLoader.java:756)
at org.apache.commons.digester.ObjectCreateRule.begin(ObjectCreateRule.java:252)
at org.apache.commons.digester.Rule.begin(Rule.java:200)
at org.apache.commons.digester.Digester.startElement(Digester.java:1273)
at org.apache.catalina.util.CatalinaDigester.startElement(CatalinaDigester.java:112)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.commons.digester.Digester.parse(Digester.java:1548)
at org.apache.catalina.startup.Catalina.load(Catalina.java:515)
at org.apache.catalina.startup.Catalina.start(Catalina.java:573)
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:324)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:297)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:398)
Catalina.start: java.lang.ClassNotFoundException: org.apache.coyote.tomcat4.CoyoteConnector
java.lang.ClassNotFoundException: org.apache.coyote.tomcat4.CoyoteConnector
at org.apache.commons.digester.Digester.createSAXException(Digester.java:2540)
at org.apache.commons.digester.Digester.createSAXException(Digester.java:2566)
at org.apache.commons.digester.Digester.startElement(Digester.java:1276)
at org.apache.catalina.util.CatalinaDigester.startElement(CatalinaDigester.java:112)
at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
at org.apache.xerces.parsers.DTDConfiguration.parse(Unknown Source)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.commons.digester.Digester.parse(Digester.java:1548)
at org.apache.catalina.startup.Catalina.load(Catalina.java:515)
at org.apache.catalina.startup.Catalina.start(Catalina.java:573)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)2004-6-16 15:25:07 org.apache.catalina.startup.Catalina start
信息: Server startup in 0 ms
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:324)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:297)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:398)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:297)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:398)
Caused by: java.lang.NullPointerException
at org.apache.catalina.startup.Catalina.await(Catalina.java:637)
at org.apache.catalina.startup.Catalina.start(Catalina.java:599)
... 6 more