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I noticed that a Web Service client created by the WS Client wizard accesses/downloads the contents of its "WSDL URL" during every runtime.
Yes, that's the intention. First, WS Client Wizard downloads the wsdl (from given URL), then generates JAX-WS artifacts from the local wsdl file. It is possible then to customize "local" wsdl file to influence the wsimport task, that generates the JAX-WS artifacts (java classes). Thus, it is possible to generate multiple clients from the same wsdl url.