[jira] [Updated] (TAP5-1481) ComponentPageElementImpl to throw a special exception when a component cannot be found by id

["Howard M. Lewis Ship (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TAP5-1481?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Howard M. Lewis Ship updated TAP5-1481:
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Seems to me that a better solution for this is more general:  in production mode, when URLs arrive that can not be processed (such as referencing an unknown page or component id), the request should not be handled by Tapestry, resulting in a standard 404 from the servlet container.

That's a big change, and should be visited in 5.4.
                
> 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: 5.2.4, 5.1.0.5
>            Reporter: Anton Litvinenko
>
> 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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