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https://issues.apache.org/jira/browse/WICKET-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12544595
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Nathan Hamblen commented on WICKET-1166:
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I tested the same scenario with a GET and there was no null pointer; it acts as 
if the form had been resubmitted normally.

> add sanity check on form submit for request method
> --------------------------------------------------
>
>                 Key: WICKET-1166
>                 URL: https://issues.apache.org/jira/browse/WICKET-1166
>             Project: Wicket
>          Issue Type: Improvement
>          Components: wicket
>    Affects Versions: 1.3.0-rc1
>         Environment: Safari 3
>            Reporter: Nathan Hamblen
>            Priority: Minor
>         Attachments: submit-method.patch
>
>
> When refreshing a frameset that includes an already POST submitted Wicket 
> form in a frame, using the redirect to render strategy, Safari erroneously 
> requests the form's original target by GET, rather than the location that was 
> eventually redirected to. Therefore none of the form values are available in 
> the request object and NPEs will occur trying to access them in places like 
> AbstractConverter.java:55.
> Because Form allows for a particular request method to be specified, I think 
> it should also confirm that the expected method was used instead of waiting 
> for an NPE in validation. The outcome is the same, but the cause of the error 
> (the client) would be more evident in server logs, etc. Patch to come...

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