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https://issues.apache.org/jira/browse/WICKET-1973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12975281#action_12975281
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Igor Vaynberg commented on WICKET-1973:
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the usecase is when a node fails and session fails over to another one.
> Messages lost upon session failover with redirect_to_buffer
> -----------------------------------------------------------
>
> Key: WICKET-1973
> URL: https://issues.apache.org/jira/browse/WICKET-1973
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.4-RC1
> Reporter: Erik van Oosten
>
> Using the redirect_to_buffer render strategy, messages in the session get
> cleared after the render.
> If the redirected request comes in at another node, the buffer is not found
> and the page is re-rendered. In this case the messages are no longer
> available.
> See the javadoc of WebApplication#popBufferedResponse(String,String).
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