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I believe there is a slightly odd implementation of the New WSDL Document wizard. If a new WSDL document wizard is started and the user hits Finish on the first page, an empty WSDL is created (besides some definitions and empty types tag). If instead they navigate to the next step and hit Finish, a WSDL is generated with default Messages, PortTypes and Extensibility Elements. Furthermore, if they hit back (to go back to the first page) after navigating to the first step, an 'empty' WSDL is again created. This happens even after making changes in the Abstract Configuration type. The state is remembered but the generated WSDL you get depends on when you terminate the wizard. If this is by design, it needs some clarity since this isn't normally the way wizards work in Windows. You normally see the same result whenever you click Finish from any page in the wizard once all the state is established.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss