/**
   * Validates fields from the registration form and either creates a new user or communicates any
   * validation errors.
   */
  public static Result submit() {
    Form<User> filledForm = signupForm.bindFromRequest();

    // Check accept conditions
    if (!"true".equals(filledForm.field("accept").value())) {
      filledForm.reject("accept", "You must accept the terms and conditions");
    }

    // Check repeated password
    if (!filledForm.field("password").valueOr("").isEmpty()) {
      if (!filledForm
          .field("password")
          .valueOr("")
          .equals(filledForm.field("repeatPassword").value())) {
        filledForm.reject("repeatPassword", "Passwords do not match");
      }
    }

    // Check if the username and email are valid
    if (!filledForm.hasErrors()) {

      String un = filledForm.get().username;
      String email = filledForm.get().email;

      if (un.equals("admin") || un.equals("guest")) {
        filledForm.reject("username", "This username is already taken");
      }

      try {
        Logger.debug("Finding user " + email);
        User.findByEmail(email);
        filledForm.reject(
            "email", "There is already an account associated with this email address.");
      } catch (Exception e) {
        // continue - the user does not exist
      }
    }

    // Return validation results to user or save user
    if (filledForm.hasErrors()) {
      return badRequest(form.render(filledForm));
    } else {
      User user = filledForm.get(); /* create an object from a form */
      User svUser =
          new User(user.username, user.email, user.password); /* recreate to get save group info */
      svUser.save();
      return ok(summary.render(svUser));
    }
  }
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  @Security.Authenticated(Secured.class)
  public static Result addNewMessageForm(Long id) {
    Form<MessageForm> mesForm = Form.form(MessageForm.class).bindFromRequest();
    if (mesForm.hasErrors()) {
      return badRequest(postNewMessage.render(mesForm, id));
    } else {

      Message m =
          new Message(
              mesForm.field("text").value().toString(), Student.find.byId(request().username()));

      Conversation c = null;

      c = Conversation.find.byId(id.toString());
      c.messages.add(m);
      c.save();

      return redirect(routes.Application.viewMyConversation(id));
    }
  }