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https://issues.apache.org/jira/browse/TAP5-1481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Howard M. Lewis Ship reassigned TAP5-1481:
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Assignee: Howard M. Lewis Ship
> ComponentPageElementImpl to throw a special exception when a component cannot
> be found by id
> --------------------------------------------------------------------------------------------
>
> Key: TAP5-1481
> URL: https://issues.apache.org/jira/browse/TAP5-1481
> Project: Tapestry 5
> Issue Type: Improvement
> Components: tapestry-core
> Affects Versions: 5.2
> Reporter: Anton Litvinenko
> Assignee: Howard M. Lewis Ship
>
> when an embedded component cannot be found by id, then
> ComponentPageElementImpl throws a TapestryException at line 841 for 5.1.0.5
> (UnknownValueException for 5.2.4).
> I suggest throwing a special kind of exception in such case (e.g.
> EmbeddedComponentNotFoundException or ComponentNotFoundException), so that
> application would be able to handle such cases separately (e.g. by serving a
> 404 error page).
> Particular use-case: google indexing bot cached a tapestry page and tries
> indexing links that are included on this page. If links are actionlinks, then
> they include id of the component. When one changes the id of the component
> (or renames the component), then the "old" link doesn't work anymore as it
> contains old id of the component -> google indexing bot is served with
> Tapestry error page (which is a typical page). Instead, it makes sense to
> send a 404 error as result and let google bot know that there is no such
> resource anymore.
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