Deployment Failure With WebLogic 10.0

I have an EAR file containing two WAR files that deploys and runs fine on
WebLogic 8.1.6.

I'd like to port the app to run under WebLogic 10.0.  I created a version 10
user domain, added the appropriate JDBC and JMS services, and modified the XML
configuration files to use the new schemas instead of DTDs.  

When I start the app server I see the following exception in the log:

[pre]
weblogic.application.ModuleException: Failed to load webapp: 'X'
[/pre]

'X' is the name of the WAR file.

A bit further down in the stack trace I see this:
[pre]
	at
javax.xml.parsers.DocumentBuilderFactory.newInstance(DocumentBuilderFactory.java
:98)
	at
com.bea.core.repackaged.springframework.beans.factory.xml.DefaultDocumentLoader.
createDocumentBuilderFactory(DefaultDocumentLoader.java:88)
	at
com.bea.core.repackaged.springframework.beans.factory.xml.DefaultDocumentLoader.
loadDocument(DefaultDocumentLoader.java:70)
	at
com.bea.core.repackaged.springframework.beans.factory.xml.XmlBeanDefinitionReade
r.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:388)
	at
com.bea.core.repackaged.springframework.beans.factory.xml.XmlBeanDefinitionReade
r.loadBeanDefinitions(XmlBeanDefinitionReader.java:340)
	at
com.bea.core.repackaged.springframework.beans.factory.xml.XmlBeanDefinitionReade
r.loadBeanDefinitions(XmlBeanDefinitionReader.java:317)
	at
com.bea.core.repackaged.springframework.beans.factory.support.AbstractBeanDefini
tionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:125)
	at
com.bea.core.repackaged.springframework.beans.factory.support.AbstractBeanDefini
tionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:141)
	at
com.bea.core.repackaged.springframework.jee.server.Bootstrap.<init>(Bootst
rap.java:81)
[/pre]

None of the classes in the stack trace are mine.

I pasted the error into Google and got this back:

http://forums.bea.com/thread.jspa?threadID=600014830

I tried adding the following to my weblogic.xml, but no joy:

[pre]
<weblogic-web-app xmlns="http://www.bea.com/ns/weblogic/90"
                  xmlns:j2ee="http://java.sun.com/xml/ns/j2ee"
                 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                  xsi:schemaLocation="http://www.bea.com/ns/weblogic/90
http://www.bea.com/ns/weblogic/90/weblogic-web-app.xsd
                                      http://java.sun.com/xml/ns/j2ee
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

   <container-descriptor>
      <prefer-web-inf-classes>true</prefer-web-inf-classes>
   </container-descriptor>
   
</weblogic-web-app>
[/pre]

What's the solution?  This is a long-standing problem, and it's not fixed in
version 10.  Did I do something wrong?

I'm going to try it in version 9.2 to see if skipping a version made my lif