After running your command you should get a message complaining about a missing web authorization file.
What you need to do is create an authorization file (usually the default name/location for it is $HOME_DIRECTORY/.metro/auth, but check the previous error message, you'll get the hint from there).
Inside this file you just write the line: "https://username:password@url?wsdl"
Once the file is created, run the wsimport command again omitting the username/password info, like this:
wsimport https://url?wsdl
Hope it helps.
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