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https://issues.apache.org/jira/browse/MYFACES-4164?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16220516#comment-16220516
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Eduardo Breijo commented on MYFACES-4164:
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Maybe, instead of just setting the view = null, I can just throw new
FacesException ("unable to create view \"" + viewId + "\"", e);
> Unexpected behavior when javax.faces.ViewState is set to "stateless" in a
> State view
> ------------------------------------------------------------------------------------
>
> Key: MYFACES-4164
> URL: https://issues.apache.org/jira/browse/MYFACES-4164
> Project: MyFaces Core
> Issue Type: Bug
> Affects Versions: 2.2.12, 2.3.0-beta
> Reporter: Eduardo Breijo
> Assignee: Eduardo Breijo
> Attachments: MYFACES-4164.patch, ProtectedViewStateless.war
>
>
> I have encountered an issue or an unexpected behavior with a stateless value
> of “javax.faces.ViewState” hidden input.
> Let’s say you navigate to a state view. When the value attribute of
> “javax.faces.ViewState” is changed manually using browser’s developer tools,
> the application can prevent CSRF attack by throwing a ViewExpiredException.
> However, if you modify the value to be “stateless”, then no
> ViewExpiredException is thrown.
> Even if you add View Protection to the state view, and modify the value to be
> “stateless”, no exception is thrown.
> The following JIRA issue said that this should be prevented with View
> Protections but it seems that’s not working.
> https://issues.apache.org/jira/browse/MYFACES-3714
> Comparing this behavior with Mojarra, if the you modify the value to be
> “stateless”, then the following exception is thrown:
> javax.faces.FacesException: Unable to restore view /stateView.xhtml
>
> com.sun.faces.application.view.FaceletViewHandlingStrategy.restoreView(FaceletViewHandlingStrategy.java:255)
>
> com.sun.faces.application.view.MultiViewHandler.restoreView(MultiViewHandler.java:157)
>
> javax.faces.application.ViewHandlerWrapper.restoreView(ViewHandlerWrapper.java:125)
>
> com.sun.faces.lifecycle.RestoreViewPhase.execute(RestoreViewPhase.java:204)
> com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
> I have provided a sample app that demonstrates this behavior.
> Instructions to recreate the behavior on Tomcat:
> 1) Deploy the app on tomcat
> 2) Drive a request to
> http://localhost:8080/ProtectedViewStateless/index.xhtml
> 3) Click the “Navigate to State View” link
> 4) Open the Browser’s Developer Tools and modify the value of
> “javax.faces.ViewState” to “stateless”
> 5) Click the “Go to Final View” button. No exception is thrown.
> If you change the MyFaces bundle to a Mojarra bundle and repeat the same
> steps, you’ll get the exception I mentioned above.
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