[JSF2] Redirect after post, flash scope, keepMessages

Question

Hi,
I'm using the redirect-after-post (or post-redirect-get) pattern [1] in a JSF2 application. To preserve the faces messages until the next request (get), I call FacesContext.getCurrentInstance().getExternalContext().getFlash().setKeepMessages(true) before returning the redirect as a result from my action method.
All works fine, however, if I keep redirect-after-posting through my application, these messages never disappear. I have to manually clear them before issuing another redirect as in:
    private static void removeRenderedMessages(FacesContext ctx) {
        final Iterator<FacesMessage> msgIterator = ctx.getMessages();
        while (msgIterator.hasNext()) {
            if (msgIterator.next().isRendered()) {
                msgIterator.remove();
    }Is this a bug or a feature (I'm using Mojarra 2.0.2 in Glassfish 3 web profile)? I was under the impression that variables in flash scope survive for exactly one request.
Cheers,
Daniel
[www.flexive.org|http://www.flexive.org]
[1] [http://en.wikipedia.org/wiki/Post/Redirect/Get|http://en.wikipedia.org/wiki/Post/Redirect/Get]

Answer 1

Hi,
I'm using the redirect-after-post (or post-redirect-get) pattern [1] in a JSF2 application. To preserve the faces messages until the next request (get), I call FacesContext.getCurrentInstance().getExternalContext().getFlash().setKeepMessages(true) before returning the redirect as a result from my action method.
All works fine, however, if I keep redirect-after-posting through my application, these messages never disappear. I have to manually clear them before issuing another redirect as in:
    private static void removeRenderedMessages(FacesContext ctx) {
        final Iterator<FacesMessage> msgIterator = ctx.getMessages();
        while (msgIterator.hasNext()) {
            if (msgIterator.next().isRendered()) {
                msgIterator.remove();
    }Is this a bug or a feature (I'm using Mojarra 2.0.2 in Glassfish 3 web profile)? I was under the impression that variables in flash scope survive for exactly one request.
Cheers,
Daniel
[www.flexive.org|http://www.flexive.org]
[1] [http://en.wikipedia.org/wiki/Post/Redirect/Get|http://en.wikipedia.org/wiki/Post/Redirect/Get]