Here\'s a trivial excerpt from my XSD file
You could try to update the property name you're seeing in the linked doc. try this instead:
com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.FACTORY
or
"com.sun.xml.internal.bind.ObjectFactory"
I'd guess that will get you past the PropertyException I figure you're seeing. The most thorough answer here, suggests this is not guaranteed to work, but worth trying since you've come this far. Source code, as far as I looked (not far) appears to support this property.