<li>
            <form id="byConsumes" class="readJsonForm" action="<c:url value="/mapping/consumes" />" method="post">
                <input id="byConsumesSubmit" type="submit" value="By consumes" />
            </form>
        </li>

$("form.readJsonForm").submit(function() {

    var form = $(this);                 // Variabile che si riferisce all'elemento nel DOM che ha scatenato l'evento click (il form)
    var button = form.children(":first");       // Seleziona il bottone submit

    var data = form.hasClass("invalid") ?       // OPERATORE CONDIZIONALE: il form ha classe "invalid" ?
            "{ "foo": "bar" }" :            // SI: foo = bar
            "{ "foo": "bar", "fruit": "apple" }";   // NO: foo= bar ; fruit = apple


    /* AJAX CALL PARAMETER:
       type: Say to the servet tath the request is a POST HTTP Request
       url: The address to which to send the call
       data: the content of my data variable
       contentType: an object having JSON format
       dataType: the type of content returned by the server
    */
    $.ajax({ type: "POST", url: form.attr("action"), data: data, contentType: "application/json", dataType: "text",
        success: function(text) { MvcUtil.showSuccessResponse(text, button); },
        error: function(xhr) { MvcUtil.showErrorResponse(xhr.responseText, button); }});

    return false;
});

@RequestMapping(value="/mapping/consumes", method=RequestMethod.POST, consumes=MediaType.APPLICATION_JSON_VALUE)
public @ResponseBody String byConsumes(@RequestBody JavaBean javaBean) {
    return "Mapped by path + method + consumable media type (javaBean '" + javaBean + "')";
}

JavaBean parameter = new JavaBean();
parameter.setFoo("bar");
parameter.setFruit("apple");