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https://issues.apache.org/jira/browse/WICKET-6507?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16301289#comment-16301289
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Andrea Del Bene commented on WICKET-6507:
-----------------------------------------

Hi,

I think fixing JavaDoc should be enough. We should just make clear that 
session's messages are included by default.

> Please add additional constructor to FeedbackCollector
> ------------------------------------------------------
>
>                 Key: WICKET-6507
>                 URL: https://issues.apache.org/jira/browse/WICKET-6507
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 8.0.0-M8
>            Reporter: Kamil
>            Assignee: Andrea Del Bene
>         Attachments: wicket race condition.gif, wicket race condition.mp4, 
> wicket-race-condition-quickstart.zip
>
>
> This bug is weird, but it has probably something to do with race condition.
> I recorded a screencast, so you can clearly see what is wrong.
> When I have some computation directly in "onSubmit" method, then JS alert is 
> invoked properly. If I try to move computation somewhere else (here I just do 
> "extract method" refactoring, but in real life this operation would be 
> executed in some top-level panel or service) then JS is not being invoked 
> (good thing: this behavior is consistent across all of my tries)!
> I attached quickstart so you can try it by yourself. The lines I'm extracting 
> are: AbstractWindow#55



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