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I got CXF working in OC4J by ignoring Oracle's XML parser and adding the Xerces parser libs as shared libraries, and by performing the QName hack above.
Integration with Application Server FAQ
1.
Q: I have this error: javax.xml.ws.WebServiceException: Cannot create SAAJ factory instance.
A: Please make sure you have the saaj-impl-1.3.jar in the classpath and make sure your app picks up this one instead of weblogic one.
Resources
Utilizing the OC4J Class Loading Framework
Deploy XFire in WebLogic
Understanding WebLogic ClassLoader
JBoss Class Configuration