I'll try to isolate the error. Roughly, I'm sending a JSON structure for an entire application object (my Module from the example above) from the client to the server where I have the PUT method from the example. Neither of the JSON attributes are mapped to the Module parameter, so an empty Java object is created and inserted in the database. But at that point, the called service doesn't provide any error log, so I have no idea whether the deserialization is called at all, can't interpret the JSON structure, or whatever. All I know is that it works with the old library setup on 1.7.4 that I sent you in my original question. So there appear to be compatibility issues between different implementations of JAX-RS.
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