[jdom-interest] Tomcat and JDOM compatability

[Walter Slotboom]

I apologize if this appears twice, original was sent from different
email address so system thinks I am non-member.

NT 4.0 sp6
Tomcat v4.01
JDOM Beta 7

I recently developed a standalone program that employed JDOM for its
XML needs, and it worked without problem (great work by all involved in
JDOM development).  However, the need has arisen for my program to be
used in a Servlet / JSP context using Tomcat.  It appears that there
exists an incompatability between the two, or some configuration
concerns.  My current assumption is that their xerces.jar have some
conflicts (I have tried using the xerces.jar provided with both JDOM
and Tomcat with the same results) .

Is there a recommended Tomcat / JDOM version mixture?
Is there a xerces.jar that works with both?
What exactly is this exception indicating?
Any other ideas?

The following code will fail regardless of whether XMLFile is a string
containing the full path or a File object.

SAXBuilder builder = new SAXBuilder();
Document doc = builder.build(XMLFile);

The exception returned is the following.

java.lang.ClassCastException: org.apache.xerces.parsers.SAXParser
        at
org.xml.sax.helpers.XMLReaderFactory.createXMLReader(XMLReaderFactory.java:128)
        at org.jdom.input.SAXBuilder.createParser(SAXBuilder.java:411)
        at org.jdom.input.SAXBuilder.build(SAXBuilder.java:283)
        at org.jdom.input.SAXBuilder.build(SAXBuilder.java:682)
        at
com.tpt.test.mimic.client.ClientReader.getClients(ClientReader.java:95)
        at
com.tpt.test.mimic.client.ClientFactory.initialize(ClientFactory.java:73)
        at
com.tpt.test.mimic.client.ClientFactory.<init>(ClientFactory.java:26)
        at
com.tpt.test.mimic.client.ClientFactory.getInstance(ClientFactory.java:88)
        at
com.tpt.test.mimic.client.ClientService.getClientNames(ClientService.java:53)
        at com.tpt.test.MimicServlet.getItems(MimicServlet.java:63)
        at org.apache.jsp.mimic$jsp._jspService(mimic$jsp.java:88)
        at
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:202)
        at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382)
        at
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:474)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
        at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
        at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:201)
        at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
        at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
        at
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2344)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
        at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
        at
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
        at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
        at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
        at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:462)
        at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
        at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:163)
        at
org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
        at
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
        at
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
        at
org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1011)
        at
org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1106)
        at java.lang.Thread.run(Thread.java:484)

Thanks for any assistance...

--
Walter


=====
--
Walter Slotboom
walterslotboom at yahoo.com
512-331-4732

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