Vaadin refresh parameter handler

@Override
public void handleParameters(Map<String, String[]> parameters) {
  if(parameters.containsKey("refresh")) {
    // refresh the layout ...
  }
}

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protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { final Map blobs = blobstoreService.getUploadedBlobs(req); final BlobKey blobKey = blobs.get("myImage"); final String uploadKey = req.getParameter("uploadKey");   final Objectify ofy = ObjectifyService.begin(); final User user = ofy.query(User.class).filter("uploadKey", uploadKey).get(); user.setBlobKey(blobKey.getKeyString()); ofy.put(user);   resp.sendRedirect("/?refresh"); }