请教SAXParseException问题

dreammore
系统是运行在Tomcat5上，基于Struts开发的，用到JFreeChart。可总是给出下面的警告，在网上找了，有的说导入xercesImpl.jar，xml-apis.jar就没事，有的说导入jcommon.jar.可都问能解决问题。望高手指点一下。叩谢！
........
ParserUtils: warning org.xml.sax.SAXParseException: No base URI; hope URI is abs
olute: http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd
ParserUtils: warning org.xml.sax.SAXParseException: No base URI; hope this SYSTE
M id is absolute: http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd
ParserUtils: warning org.xml.sax.SAXParseException: URI was not reported to pars
er for entity [dtd]
ParserUtils: warning org.xml.sax.SAXParseException: missing system ID, using htt
p://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd
ParserUtils: warning org.xml.sax.SAXParseException: URI was not reported to pars
er for entity [document]
ParserUtils: warning org.xml.sax.SAXParseException: No base URI; hope URI is abs
olute: http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd
........
dreammore 2005-12-08 15:54
不好意思，上面是未能解决问题。
banq 2005-12-08 17:22
你将你的机器联网后试验看看可否。可能是一些支持包版本太老了一些。