I got this reply from UDDI4J:
"uddi4j-wsdl.jar is shipped in the ETTK (Emerging technology toolkit). It is not open source and it not part of the uddi4j project. The ettk is available from,
http://alphaworks.ibm.com/tech/ettk David Melgar
Web Services Toolkit Development
Emerging Technologies
dmelgar@us.ibm.com"
I am following an example from the University of North Carolina involving publishing a Web Service to a UDDI Registry.
Their example modifies a simple publish/client program from IBM and imports the ServiceInterface class under the com.ibm.uddi4j.wsdl.defintion package.