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https://issues.apache.org/jira/browse/MYFACES-3105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13030016#comment-13030016
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Martin Kočí commented on MYFACES-3105:
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I think this is still not solved, at least a user reports it:
http://www.mail-archive.com/users@myfaces.apache.org/msg57266.html
> Navigation with redirect after ViewExpiredExpcetion throws NPE
> --------------------------------------------------------------
>
> Key: MYFACES-3105
> URL: https://issues.apache.org/jira/browse/MYFACES-3105
> Project: MyFaces Core
> Issue Type: Bug
> Components: General
> Affects Versions: 2.0.6-SNAPSHOT
> Environment: myfaces trunk
> Reporter: Martin Kočí
>
> http://www.nfjsone.com/blog/ed_burns/2009/09/dealing_gracefully_with_viewexpiredexception_in_jsf2.
> MYFACES-3101 patch solves that for HTML request.
> For partial/ajax request/response new problems appear: if you try to use
> redirect like:
> /viewExpired.xhtml?faces-redirect=true
> myfaces throw NPE in
> org.apache.myfaces.context.servlet.PartialViewContextImpl.getPartialResponseWriter(),
> because
> _facesContext.getRenderKit() returns null in this case (no view root is
> available)
> Second easy to fix problem is line
> facesContext.getViewRoot().getViewId().equals(newViewId) in
> NavigationHandlerImpl.handleNavigation(FacesContext, String, String) in case
> of navigationCase.isRedirect().
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