I was able to test the Web Services Explorer following these instructions:
http://community.jboss.org/wiki/CreatingaJSR181WebServiceusingJBTJBDSTooling

Hello World works well but the UDDIv3 Inquiry service provided by jUDDI does not, if you are running SOA-Pv5 this WSDL can be found at: http://localhost:8080/juddiv3/services/inquiry?wsdl

This WSDL works fine in soapUI.

I will upload the WSDL as well as some screenshots.