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https://issues.apache.org/jira/browse/TAPESTRY-1865?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12547295
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Howard M. Lewis Ship commented on TAPESTRY-1865:
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I'm definately having trouble following your issue.
In terms of your final question: "Why
does the MenuBar in the second request not see the changes done in the
first request?" ...
this is normal, on each request its as if the whole application starts anew,
except for information in the request and in the server-side session. The
MenuBar component's fields will have been "scrubbed" between requests. After
all, in a production app, it may be a different instance of the page
(containing MenuBar) or even a different instance inside a different server of
the application cluster.
> ApplicationState depending on order of usage
> --------------------------------------------
>
> Key: TAPESTRY-1865
> URL: https://issues.apache.org/jira/browse/TAPESTRY-1865
> Project: Tapestry
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.0.6
> Reporter: Christoph Jäger
>
> (Basically copied from my email in the mailing list)
> After upgrading from 5.0.5 to 5.0.6 my application somehow seems to not work
> with the @ApplicationState as before.
> I have three components on my page:
> - LanguageSwitch
> - MenuBar
> - Login
> Depending on who is logged in and the selected language, a different
> menu is displayed. All three components have a property
> @ApplicationState private Menu menu;
> MenuBar has an additional property
> private boolean menuExists;
> to query if a menu has yet been set.
> When the language is switched, the component calls "menu=null;" to force
> the MenuBar component to create a new menu.
> When someone logs in or out, the Login component calls "menu=null;" for
> the same reason.
> The MenuBar component calculates a new menu (based on selected language
> and logged in user) if it finds that there is no existing menu
> (menuExists==false).
> This setup worked as expected in 5.0.5, but after I switched to 5.0.6,
> the menu=null in the Login component seems to get ignored (from
> LanguageSwitch it works as before). I think it depends on the order of
> components: LanguageSwitch is before MenuBar, so MenuBar sees the
> changes done in LanguageSwitch, but not the changes done in Login.
> The Login component calls menu=null in two places: in
> onSuccessFromFormLogin(), after the "Login" submit button was clicked,
> and onActionFromLogout(), after the ActionLink titled "logout" is
> clicked. I get the same behaviour for both calls.
> What is strange here: adding some logging, I see that the click on the
> "Switch Language" ActionLink, as well as the "logout" ActionLink and the
> click on the "Login" button create two requests (this is as expected).
> In the first request, menu=null is called. In the second request, the
> MenuBar component checks for the existence of the menu property. Why
> does the MenuBar in the second request not see the changes done in the
> first request?
> If a small example showing the problem is needed, please let me know.
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