Spring 4 RestController: not receiving data from PUT request

I'm trying to build a very basic REST API using Spring.

My URL endpoints are:

GET    /notes
GET    /notes/{noteId}
POST   /notes
PUT    /notes/{noteId}
DELETE /notes/{noteId}

All these endpoints work perfectly fine as expected except the PUT request which I want to run to update an item.

The problem is that data is not being received via PUT, where as it works fine for POST.

Here's my controller; I've tested it by adding a method identical to the update method but using POST and that works fine. I don't know why?

package notes;

import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/notes")
public class NotesController {

    ...

    @RequestMapping(value="/{noteId}", method=RequestMethod.PUT)
    public Response update(@PathVariable Integer noteId, Note note) {

        return new Response("Note Updated", note);

    }

    @RequestMapping(value="/{noteId}", method=RequestMethod.POST)
    public Response updateWithPost(@PathVariable Integer noteId, Note note) {

        return new Response("Note Updated", note);

    }

    ...

}

Using postman, I've tested POST http://ift.tt/1GwCsWT and the response was:

{
    "message": "Note Updated",
    "note": {
        "id": null,
        "title": "Hello World detail content",
        "text": "Hello World",
        "createdAt": "72, Mar 2015",
        "updatedAt": "72, Mar 2015"
    }
}

But for PUT http://ift.tt/1GwCsWT with exactly same data the response was:

{
    "message": "Note Updated",
    "note": {
        "id": null,
        "title": "",
        "text": "",
        "createdAt": "72, Mar 2015",
        "updatedAt": "72, Mar 2015"
    }
}

Response Class

package notes;

public class Response {

    private String message;
    private Note note;

    public Response(String text) {
        setMessage(text);
    }

    public Response(String text, Note note) {
        setMessage(text);
        setNote(note);
    }

    //...getters/setters
}

Note Class

package notes;

import java.text.SimpleDateFormat;
import java.util.Date;

public class Note {

    private Integer id = null;
    private String title = "";
    private String text = "";
    private Date createdAt = new Date();
    private Date updatedAt = new Date();

    public Note() {}

    public Note(String title, String text) {
        this.setTitle(title);
        this.setText(text);
    }


    //...getters/setters
}

I don't know why this is not working?