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I am trying to send a POST request to a servlet. Request is sent via jQuery in this way: var productCategory = new Object(); productCategory.idProductCategory = 1; productCategory.description = "Descrizione2"; newCategory(productCategory); where newCategory is function newCategory(productCategory) { $.postJSON("ajax/newproductcategory", productCategory, function( idProductCategory) { console.debug("Inserted: " + idProductCategory); }); } and postJSON is $.postJSON = function(url, data, callback) { return jQuery.ajax({ 'type': 'POST', 'url': url, 'contentType': 'application/json', 'data': JSON.stringify(data), 'dataType': 'json', 'success': callback }); }; With firebug I see that JSON is sent correctly: {"idProductCategory":1,"description":"Descrizione2"} But I get 415 Unsupported media type. Spring mvc controller has signature @RequestMapping(value = "/ajax/newproductcategory", method = RequestMethod.POST) public @ResponseBody Integer newProductCategory(HttpServletRequest request, @RequestBody ProductCategory productCategory) Some days ago it worked, now it is not. I'll show more code if needed.

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