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From "Alexander Mazuruk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLEX-33987) FocusManager NPE
Date Mon, 16 Dec 2013 15:01:20 GMT

    [ https://issues.apache.org/jira/browse/FLEX-33987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13849219#comment-13849219
] 

Alexander Mazuruk commented on FLEX-33987:
------------------------------------------

Unfortunately, until all patches are vanished away it's not possible to compile against 4.11.
DataGrid changes since there are in critical conflict with our patches(adding freezed columns
functionality).

This issue reproduced sporadically, it has an asynchronous nature. Most likely reproducible
with a checkbox control as and item editor.
Sorry, guys, don't have much time to spend on this issue, I have to log some more issues for
you. I have no resources to dig into deeper understanding on "why" this thing happened in
real life, when it's impossible in Theory. 

One thing I know from theory: If you have a function having "return null;" in it, it will
fire sooner or later, later or sooner. So I'm not brave enough to assume that it will never
will happened.

In my team I'm cutting fingers for that kind of code (:


> FocusManager NPE
> ----------------
>
>                 Key: FLEX-33987
>                 URL: https://issues.apache.org/jira/browse/FLEX-33987
>             Project: Apache Flex
>          Issue Type: Bug
>    Affects Versions: Adobe Flex SDK 4.5.1 (Release), Apache Flex 4.11.0
>            Reporter: Alexander Mazuruk
>            Priority: Critical
>
> FocusManager Null pointer exception occurs.
> This:
>     public function getNextFocusManagerComponent(
>                             backward:Boolean = false):IFocusManagerComponent
> 	{
> 		return getNextFocusManagerComponent2(backward, fauxFocus).displayObject as IFocusManagerComponent;
> 	}
> Must be rewritten as:
> public function getNextFocusManagerComponent(
>                             backward:Boolean = false):IFocusManagerComponent
> 	{
>         const focusInfo:FocusInfo = getNextFocusManagerComponent2(backward, fauxFocus);
>         return focusInfo ? focusInfo.displayObject as IFocusManagerComponent : null;
> 	}



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