/**
  * PUT method for updating or creating an instance of StudentsResource
  *
  * @param id
  * @param title
  * @param content representation for the resource
  */
 @PUT
 @Path("/newsletter/{id}")
 public void updateNewsletterById(
     @PathParam("id") int id,
     @QueryParam("title") String title,
     @QueryParam("content") String content) {
   WSRestNewsletter.updateNewsletterById(id, title, content);
 }