public final Result json(Object obj) {
        final Result response = ok().contentType(MediaType.APPLICATION_JSON).renderable(obj);
        holder.setControllerResult(response);
        return response;
    }
public final Result json ( Object obj ) { final Result response = ok ( ) . contentType ( MediaType . APPLICATION_JSON ) . renderable ( obj ) ; holder . setControllerResult ( response ) ; return response ; }
This method will send a JSON response to the client.
It will not use any layouts.
Use it to build app.services and to support AJAX.

@param obj
@return {@link Result}, to accept additional information. The response is automatically
has its content type set to "application/json"