You are right now WSDLC is not a option for JAXWS to generate implementation class.
For more details you can check following BUG BUG 8172108: WSDLC FOR JAXWS SHOULD NOT PACK THE DEFAULT SERVICE IMPL CLASS INTO COMPILED JAR
You can do this by using the <binding> child element inside the wsdlc.
The <binding> child element of wsdlc and clientgen allows you to specify one or more customization files that declare JAX-WS or JAXB custom bindings.
this worked for me... generating serializable Java classes.
node not found error was due to the fact that i was trying to specify many files for schema location using some wild card... it seems to work if you only specify one single xsd file, even if many more are compiled in same location!