DO NOT REPLY [Bug 6248] New: - using xerces in webapp causes class cast exception

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http://nagoya.apache.org/bugzilla/show_bug.cgi?id=6248

using xerces in webapp causes class cast exception

           Summary: using xerces in webapp causes class cast exception
           Product: Tomcat 4
           Version: 4.0.1 Final
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: Blocker
          Priority: Other
         Component: Catalina
        AssignedTo: tomcat-dev@jakarta.apache.org
        ReportedBy: s.kost@webmacher.de


Even after reading the docs (
http://jakarta.apache.org/tomcat/tomcat-4.0-doc/class-loader-howto.html)
and mailing list archive (
http://marc.theaimsgroup.com/?l=tomcat-user&r=1&w=2)
I am still stuck with the following problem:
We are currently using jboss-2.4.4 with tomcat-3.2.3 and I am trying to
upgrade to tomcat 4.0.1 as we need its newer jsp features. Our
application is using jsp together with a custom xsl-tag-library based on
xalan/xerces. JBoss itself is using xerces as its xml-parser (for
configs) in our setup. I plugged it in using JAXP.
Now when I am trying to access any jsp which is using the xsl-taglibrary
(which uses xalan/xerces) under tomcat 4.0.1 I get:
-------------- snip ---------------
type Exception report

message Internal Server Error

description The server encountered an internal error (Internal Server
Error) that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet.init() for servlet jsp threw
exception
...
root cause

java.lang.ClassCastException:
org.apache.xerces.jaxp.DocumentBuilderFactoryImpl
        at
javax.xml.parsers.DocumentBuilderFactory.newInstance(DocumentBuilderFactory.java:103)
...
-------------- snip ---------------

I guess the issue is somehow related to the fact that jboss is not
starting tomcat separately but using it as an own service and thus
tomcat inherits the classpath. The classpath in turn contains
../lib/xml-apis.jar:../lib/xerces.jar:../lib/xalan.jar

I've read about the issuses with xerces and tried to copy the xerces.jar
included with tomcat 4.0.1 (size 1808883 bytes) over all location of
mine; still it happens.
Apart from the location which is included in the classpath I have xerces sitting
in my webapps WEB-INF/lib folder and tried other locations too.

At the moment I am out of ideas, but more than willing to try out anything you
hopefully can suggest - thanks for listening

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