[FLEX-19881] mx.core.Application.application Null Error in Gumbo

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Adobe Flex SDK Previous
• Fix Version/s: Adobe Flex SDK Previous
• Component/s: mx: Application
• Environment: Affected OS(s): All OS Platforms; Affected OS(s): All OS Platforms; Browser: Internet Explorer 7.x; Language Found: English
• Assignee: Adobe JIRA
• Reporter: Adobe JIRA
• Created: 18/Jun/09 16:01
• Updated: 15/Apr/11 15:06
• Resolved: 17/Sep/09 14:21

Description

Steps to reproduce:
1. attach an event listener to creation complete
2. attempt to access mx.core.Application.application

Actual Results:
returns null

Expected Results:
an instance of the running Application

Workaround (if any):
There is no workaround.

Notes:
This causes all flex applications < 4.0 that use Application.application to break.

on lines #309 of the mx.core.Application class contains:

return FlexGlobals.topLevelApplication as Application;

since this line of code is within mx.core.Application it attempts to cast the value of topLevelApplication to the mx.core.Application type... in a Flex 5 Gumbo project, FlexGlobals.topLevelApplication is a spark.components.Application type. This line of code attempts to cast a spark.components.Application to an mx.core.Application resulting in a null value.

Fix:
do not cast FlexGlobals.topLevelApplication.