POST JSON fails with 415 Unsupported media type, Spring 3 mvc
I've had this happen before with Spring @ResponseBody and it was because there was no accept header sent with the request. Accept header can be a pain to set with jQuery, but this worked for me source
$.postJSON = function(url, data, callback) { return jQuery.ajax({ headers: { 'Accept': 'application/json', 'Content-Type': 'application/json' }, 'type': 'POST', 'url': url, 'data': JSON.stringify(data), 'dataType': 'json', 'success': callback });};The Content-Type header is used by @RequestBody to determine what format the data being sent from the client in the request is. The accept header is used by @ResponseBody to determine what format to sent the data back to the client in the response. That's why you need both headers.
adding content type into the request as application/json resolved the issue
I had a similar problem but found the issue was that I had neglected to provide a default constructor for the DTO that was annotated with @RequestBody.