FeedbackPanel / just showing one error message / missing messages

[Patrick Davids <pa...@nubologic.com>]

Hi all,
I'm struggling around with a feedback panel.

What I would like to implement is a single global feedback panel in the 
top hierarchy of my page inheritence.

Its a sort of fallback-panel. If no other feedback panel catches the 
messages, it should display them, so its a FencedFeedback. A form or 
other component can have an own feedback panel with the component as a 
fence.

This global feedback panel should display only one single message.
Independent of how many e.g. form validation errors occur.
So its configured setMaxMessages(1).

To avoid displaying all other messages in sequence as long the user 
reloads the page, I have implemented a FeedbackCollector marking all of 
them rendered (onDetach()).

This all works quite good in the past.
But just one page, I have implemented once, does not show any messages 
at all by entering the page.

And I really really dont know why.

Also Session.get().error("my error message") does not work.

It seems to me, onDetach() is called earlier on this page, as on other 
pages, so my markRendered() of the FeedbackCollector is executed to 
early, but I am not sure.

Does anyone have an hint to me, what can force an early detach()?
Or what can force a cleanup of feedback messages?
Where should I put a breakpoint to have a deeper look?

Really thanx for help!

kind regards
Patrick
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