ApplicationState depending on order of usage
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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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