You still should edit php.ini and change always_populate_raw_post_data' to '-1'.
In XAMPP it is already there, but a ";" is in front of the setting to comment it out.
Is the survey activated and has some responses?
Personally I don't use the API via Java, but I would add the optional parameters and don't leave them empty. Perhaps it is a bug in the API.
You will have to play a bit with it. Perhaps use CSV to test if it is working at all.
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