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From Martin Kočí (JIRA) <...@myfaces.apache.org>
Subject [jira] [Created] (MYFACES-3105) Navigation with redirect after ViewExpiredExpcetion throws NPE
Date Thu, 07 Apr 2011 11:10:05 GMT
Navigation with redirect after ViewExpiredExpcetion throws NPE
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                 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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