XML Parsing issue

[S Gibbs]

Hi Guys,
I'm really banging my head against a wall with this one, and was hoping someone could poke me in the right direction. I'm trying to parse xml using x:parse and the like. However I only ever get returned:

[#document: null]

Now my understanding is that this implies that tomcat cannot see the classes involved. However I've now put xalan.jar, resolver.jar, serializer.jar, xercesImpl.jar, xml-apis.jar, & xsltc.jar, the classes I'm told I need, in about every concivable lib folder on the server (WEB-INF/lib, the tomcat common/lib folder, and the java/lib folders) and I've had no luck.

If you try to do anything other the parse you get this error:

java.lang.NoClassDefFoundError
	at org.apache.xpath.XPath.initFunctionTable(XPath.java:62)
	at org.apache.xpath.XPath.<init>(XPath.java:168)
	at org.apache.taglibs.standard.tag.common.xml.JSTLXPathAPI.eval(JSTLXPathAPI.java:285)
	at org.apache.taglibs.standard.tag.common.xml.XPathUtil.selectNodes(XPathUtil.java:527)
	at org.apache.taglibs.standard.tag.common.xml.ForEachTag.prepare(ForEachTag.java:50)
	at javax.servlet.jsp.jstl.core.LoopTagSupport.doStartTag(LoopTagSupport.java:227)
	at org.apache.jsp.test.xml_jsp._jspx_meth_x_forEach_0(xml_jsp.java:152)
	at org.apache.jsp.test.xml_jsp._jspService(xml_jsp.java:80)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
	at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:738)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:186)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
	at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
	at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
	at org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:300)
	at org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:374)
	at org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:743)
	at org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.java:675)
	at org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:866)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
	at java.lang.Thread.run(Thread.java:595)

and for refrence this is the code I'm currently trying to just test things are working (the url is working and checked, the url var has the xml in):

<%@ page contentType="text/html" %>   

<%@ taglib  prefix="c" uri="http://java.sun.com/jstl/core" %> 
<%@ taglib prefix="x" uri="http://java.sun.com/jsp/jstl/xml" %>

<html>  
	<body>  
	 <c:import url="books.xml" var="url" />  
	 <x:parse xml="${url}" var="doc"   />

	 -----------------------------------------------<br/>

	 <x:forEach var="n" select="$doc/books/book">
		<x:out select="$n/title"  />
		<br/>  
		<x:out select="$n/author"  />  
		<br/>
		========  
		<br/>  
	 </x:forEach>
	</body>
</html>

Any help would be much appreciated!
Thanks

[Paul Clapham]

S Gibbs wrote:Hi Guys,
I'm really banging my head against a wall with this one, and was hoping someone could poke me in the right direction. I'm trying to parse xml using x:parse and the like. However I only ever get returned:

[#document: null]

Now my understanding is that this implies that tomcat cannot see the classes involved.

No, that's wrong. It just means that the toString() method of a Document object returns that string. So it tells you that you have successfully created a Document object. As you can see it doesn't tell you anything more about that Document object; you would have to write other code to do that.

[S Gibbs]

Paul Clapham wrote:

S Gibbs wrote:Hi Guys,
I'm really banging my head against a wall with this one, and was hoping someone could poke me in the right direction. I'm trying to parse xml using x:parse and the like. However I only ever get returned:

[#document: null]

Now my understanding is that this implies that tomcat cannot see the classes involved.

No, that's wrong. It just means that the toString() method of a Document object returns that string. So it tells you that you have successfully created a Document object. As you can see it doesn't tell you anything more about that Document object; you would have to write other code to do that.

Ahh - my misunderstanding then. Thanks.
Any suggestions as to why anything else other than parse causes it to crash then?

[William Brogden]

There is a lovely table in the javadocs for org.w3c.dom.Node which everybody working with XML should be familiar with.

In that table you will see what the "nodeValue" is for every kind of Node - for example a Document node returns null and has nodeName of #document

Bill