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https://issues.apache.org/jira/browse/MYFACES-3189?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13055059#comment-13055059
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Martin Kočí commented on MYFACES-3189:
--------------------------------------
Steps to reproduce:
1) provide own exception handler:
http://weblogs.java.net/blog/edburns/archive/2009/09/03/dealing-gracefully-viewexpiredexception-jsf2
2) ExceptionHandler snippet:
if (t instanceof ViewExpiredException) {
NavigationHandler nav = facesContext.getApplication().getNavigationHandler();
try {
nav.handleNavigation(facesContext, null, "/NonExistentViewExpired.xhtml");
facesContext.renderResponse();
} finally {
i.remove();
}
}
3) deploy; simulate ViewExpiredException, for example modify ViewState value in
DOM with firebug and submit view
4) NPE appears: java.lang.NullPointerException
at
org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:60)
at org.apache.myfaces.lifecycle.LifecycleImpl.render
Environment: myfaces 2.1.2-SNAPSHOT, Tomcat 6.0.26
To problem is in "/NonExistentViewExpired.xhtml" - if case of VVE, there is no
UIViewRoot restored and if NonExistentViewExpired does not exists, there is no
UIViewRoot to render.
> NavigationHandler: navigation to nonexistent view after ViewExpired throws NPE
> ------------------------------------------------------------------------------
>
> Key: MYFACES-3189
> URL: https://issues.apache.org/jira/browse/MYFACES-3189
> Project: MyFaces Core
> Issue Type: Bug
> Affects Versions: 2.0.8-SNAPSHOT, 2.1.2-SNAPSHOT
> Reporter: Martin Kočí
>
> see
> http://weblogs.java.net/blog/edburns/archive/2009/09/03/dealing-gracefully-viewexpiredexception-jsf2
> If user provides nonexistent viewId, NPE occurs: MYFACES-3188
> navigation in this situation leads to facesContext.viewRoot = null. I don't
> know what spec says about it but mojarra stays on current view in this case
> (navigate?) - on that view, where VVE is.
> We should also provide a warning about this situation.
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