WebServices from WSDL in a natural way

[sciacallo]

Hi Folks,
I have just started to develop web services and I following the contract first style. I'm not using a particular framework, for now. Just creating XSD->WSDL -> webservices, everything with the aid of NetBeans 6.5.
I have one xsd and one wsdl file and it's straight forward to update xsd and then the wsdl using the design view, adding new elements and declaring new services/messages/ports etc...
Two problems:
1) which wsdl file I must modify ? Looking at the project (Ctrl+1) tree the same wsdl file is present in : Configuration File->wsdl->myservice,Configuration File->xml-resources->web-services->myservice->wsdl, Source Package->default package.
Usually I modify the wsdl in Source Package but the others seem to be old versions, I think they should reflect the new one, isn't it? Otherwise I need to copy the wsdl in the others position.

2) The adding an operation to my wsdl (Source Package), is there a way to refactor the service's class adding only the new operation starting from the updated wsdl ?

I found, on netbeans.org, a lot of tutorials on faster approach (not-contract-first), I know that probably this is a different approach. If you have some docs with contract-first and netbeans please share it.

Is Spring the solution ?

Cheers.