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https://issues.apache.org/jira/browse/FLEX-33987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13913751#comment-13913751
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Alex Harui commented on FLEX-33987:
-----------------------------------
Was able to reproduce with a contrived test case:
<?xml version="1.0" encoding="utf-8"?>
<!-- dpcontrols\sparkdpcontrols\SparkDGItemEditor.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009";
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
width="450">
<fx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
[Bindable]
private var myDP:ArrayCollection = new ArrayCollection([
{label1:"Order #2314", quant:3, Sent:true},
{label1:"Order #2315", quant:3, Sent:false}
]);
]]>
</fx:Script>
<s:DataGrid id="myDG" width="100%" focusEnabled="false"
dataProvider="{myDP}"
variableRowHeight="true"
editable="true" >
<s:columns>
<s:ArrayList>
<s:GridColumn dataField="label1" headerText="Order #"
rendererIsEditable="true"/>
</s:ArrayList>
</s:columns >
</s:DataGrid>
</s:Application>
They "contrived" part is setting DG focusEnabled=false and also making the
mistake of setting rendererIsEditable when the renderer is not editable.
The only way I can figure out to cause this stack trace is to somehow prevent
the DG and editable widgets from getting registered with the FocusManager. In
a well-behaved application, there should be at least one focusable widget
per-screen.
I'll add the null check to make the FocusManager more fault-tolerant, but it
sort of implies that the application is mis-configured in some way.
> FocusManager NPE
> ----------------
>
> Key: FLEX-33987
> URL: https://issues.apache.org/jira/browse/FLEX-33987
> Project: Apache Flex
> Issue Type: Bug
> Components: Focus Manager
> Affects Versions: Adobe Flex SDK 4.5.1 (Release), Apache Flex 4.11.0
> Reporter: Alexander Mazuruk
> Assignee: Alex Harui
> 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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