when I want to redirect in my page to other I use this method exception:
throw new RedirectToUrlException(\"/login/j_security_check?j_username=\" + username
POST redirects are a somewhat esoteric edge case with most browsers. Wicket's RedirectRequestHandler currently only supports HTTP codes 301 and 302. POST redirect would require 307, which will also show a warning to the user.
That said, what you are trying to do is inherently unsafe. Do not ever send a password back to the client.
Long story short: Wicket doesn't support this, and you shouldn't be doing this anyway.