[jira] Updated: (WICKET-3218) Component#onInitialize is broken for Pages

["Carl-Eric Menzel (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/WICKET-3218?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Carl-Eric Menzel updated WICKET-3218:
-------------------------------------

    Attachment: 0001-added-page-onpageinitialize.patch

A patch against Wicket 1.4.14 that does what I outlined in the bug description. Includes appropriate test cases.

> Component#onInitialize is broken for Pages
> ------------------------------------------
>
>                 Key: WICKET-3218
>                 URL: https://issues.apache.org/jira/browse/WICKET-3218
>             Project: Wicket
>          Issue Type: Bug
>          Components: wicket
>    Affects Versions: 1.4.14
>            Reporter: Carl-Eric Menzel
>         Attachments: 0001-added-page-onpageinitialize.patch
>
>
> As first mentioned at http://mail-archives.apache.org/mod_mbox/wicket-dev/201012.mbox/%3C1291238699.1749.1408166705@webmail.messagingengine.com%3E , I think the current (Wicket 1.4.14) implementation of Component#onInitialize is broken for Pages. Pages get initialized as soon as the first component is added, which is correct. But this usually happens within the constructor of the page, which means that the page object isn't fully initialized yet. The entire point of having onInitialize, however, is to be able to do further work once all constructors have run. See https://github.com/duesenklipper/wicket-oninitialize for a quickstart that demonstrates the problem.
> Pedro Santos suggested in the above thread to just switch the entire object construction to onInitialize. I don't think this is a good idea, because
> 1) it is completely counter-intuitive
> 2) it is not always realistic to have an entire class hierarchy not using the constructor just because a subclass somewhere might want to use onInitialize
> 3) it is inconsistent with onInitialize behavior for all other (non-Page) components. Here I can easily mix work in the constructor with onInitialize.
> I propose the following patch:
> - override onInitialize in Page and make it final, so Pages can't use this any more. This should not cause any unnecessary breaking, since currently it's not working for pages anyway.
> - introduce Page#onPageInitialize to provide a safe alternative to onInitialize
> - make a special case for Page in Component's beforeRender to fire Page#onPageInitialize if necessary
> Yes, this is a bit of special casing for Page, but there's quite a lot of that needed for Page anyway. I think the impact of this should be minimal.
> My page includes documentation and a new testcase that verifies the new behavior. I modified the old ComponentInitializationTest to reflect the fact that Page doesn't get onInitialize any more.

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