code: public void invite(EntityBareJid user, String reason) throws NotConnectedException, InterruptedException {
          invite(new Message(), user, reason);
      }
docs: Invites another user to the room in which one is an occupant. The invitation
  will be sent to the room which in turn will forward the invitation to the invitee.<p>
  
  If the room is password-protected, the invitee will receive a password to use to join
  the room. If the room is members-only, the the invitee may be added to the member list.
  
  @param user the user to invite to the room.(e.g. hecate@shakespeare.lit)
  @param reason the reason why the user is being invited.
  @throws NotConnectedException
  @throws InterruptedException