急，Tomcat 4.1.29下配置连接池出错。

[harryzhangred]

tomcat4.1.29。
按该http://www.zdnet.com.cn/developer/code/story/0,2000081534,39134180-3,00.htm和Tocmat的帮助文档webapps\tomcat-docs\jndi-datasource-examples-howto.html的设置好了server.xml和web.xml。但在启动时就出现如下错误，并且一响而过。
Catalina.start: java.io.UTFDataformatException: Invalid byte 1 of 1-byte UTF-8 sequence.
java.io.UTFDataformatException: Invalid byte 1 of 1-byte UTF-8 sequence.
at org.apache.xerces.impl.io.UTF8Reader.invalidByte(Unknown Source)
at org.apache.xerces.impl.io.UTF8Reader.read(Unknown Source)
at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)
at org.apache.xerces.impl.XMLEntityScanner.scanData(Unknown Source)
at org.apache.xerces.impl.XMLScanner.scanComment(Unknown Source)
at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanComment(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.start(Catalina.java:449)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
at java.lang.reflect.Method.invoke(Native Method)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)

但是我把连接池有关的内容删除却又能正常启动。我查了很多地方都没有找到原因。
mysql的jdbc已复制到common\lib下了。

请大家指点。谢谢。