If you are using the "contract first" approach, the best way to add a method is indeed to modify the WSDL and then regenerate your classes with wsdl2java.
If you are using the "contract first" approach, the best way to add a method is indeed to modify the WSDL and then regenerate your classes with wsdl2java. The tools will recreate all your skeleton classes so make sure that this does not override any code you added to it or you will loose your modifications. To avoid this you should generate an interface for the skeleton with the -ssi parameter.
Then, have your own class implement this interface and use it instead of the implementation that the wsdl2java creates.
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