I have 2 pages, each with a feedback panel. Page2 does the following:

The problem I have is that "blah" is never displayed in the feedback panel of Page1. I stepped in the request processing code and found that setResponsePage() actually renders the full current page before throwing that away and issuing a 302 redirect. During this first (unused) rendering of Page2, its feedback panel consumes all the session messages. After the client follows the 302 and requests Page1, there are no more session messages to display.

Instead of setResponsePage, I can use a RestartResponseException to redirect to Page1 and the session messages will then be displayed on Page1 because Page2 is never rendered. However this has the important downside of also throwing away all header information (e.g. cookies like setACookie() above).

Is there a way to both set a cookie and display the session message on the response page?

I'm also wondering why, when setResponsePage() is used, the current page is still rendered. I can think of 3 reasons why this should be avoided:
1-Performance; it's wasteful to render components to discard them right away

2-Components hierarchy; even if setResponsePage() is used in a page constructor (e.g. when redirecting depending on page parameters), since the page is rendered, all of its components or some substitutes must be added to the page. Otherwise Wicket will throw a missing component exception in dev mode.

3-My use case; feedback messages registered in the session can be swallowed by a feedback panel in the thrown away page rendering.

Of course, I definitely don't have the complete picture and am just now making some sense of how Wicket handles redirects and responses.


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