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https://issues.apache.org/jira/browse/TAPESTRY-1780?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12531205
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Daniel Gredler commented on TAPESTRY-1780:
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Any ideas on how this should be handled? It's easy enough to check for the
condition and throw a TapestryException rather than a NPE, but that's not very
user-friendly. As Janko says, this is easily reproduceable by doing a GET
request on a form's action URL. My feeling is that this will happen enough in
the real world, in deployed applications, that we need to redirect to the
owning page or something. Thoughts?
> T5 Form component NPE if no FORM_DATA found
> -------------------------------------------
>
> Key: TAPESTRY-1780
> URL: https://issues.apache.org/jira/browse/TAPESTRY-1780
> Project: Tapestry
> Issue Type: Bug
> Components: Core Components
> Affects Versions: 5.0.5
> Reporter: Janko Muzykant
> Priority: Minor
> Fix For: 5.0.6
>
>
> if no FORM_DATA is found in a request, form component throws NPE in
> onAction(..) handler. it's quite easy to reproduce, just hit the
> http://my-webapp/mypage.form url.
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