Well the 2 major ways to communicate between server and client are XML and
JSON I guess, besides HTML of course.I believe any "hardcore" java developer
is familiar with XML. So if you are willing to deal with XML you can ask
them to format their "input"(for you, or output for them) in decided XML
format.
Or you can ask them to read something about JSON and format to that and send
as plain text to you.

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