Receive multipart data from the client

Question

I have s service which return the multipart data like this :

public ResponseEntity<MultiValueMap<String, Object>> getData(){

    MultiValueMap<String, Object> resultMap = new LinkedMultiValueMap<String, Object>();

    //Add a pdf doc 
    resultMap.add("file", new byte[]);
    resultMap.add("object",new String("Hello");
}

this multivaluemap is returned.

Now, I am not sure how to go about with the client code for this :

ResponseEntity<MultiValueMap<String, Object>> response = restTemplate.exchange(builder.build().encode().toUri(), HttpMethod.GET,entity,**?**);

Is this the right way to invoke and get the results?If so what would be the class name for ? . Any pointers would be greatly appreciated.

Thanks