Adobe even more braindead. How to properly configure Flash Builder 4 for debugging Flash, Flex, and MXML?

(Last Updated On: October 26, 2010)

Adobe even more brain dead. How to properly configure Flash Builder 4 for debugging Flash, Flex, and MXML?

Once again Adobe proves to be really, really brain dead. I have searched for any tutorials that help me set up Flash Builder 4


Anyhow, I don’t see any mentioned of how to set up the configuration of Flash Builder 4 for debugging. It does not appear out of the box as you would expect. If you download Eclipse’s free Java integrated development environment, the debugger out of the box with no additional external tool. With Adobe’s moronic way, you need to ensure you download the embedded debugging Flash player.  Here:


9/20/2010 Updated debugger (aka debug players or content debuggers) and standalone (aka projector) versions of Flash Player 10.1 are available for Flash Builder 4, Flash Catalyst, Flash Professional CS4, and Flash Professional CS5 users. These players contain fixes for critical vulnerabilities identified in Security Bulletin APSB10-22. All users are encouraged to update to the new players. These new players are version

Nice one Adobe. Must have been that pot your stupid engineers smoke. Or sorry, maybe they were born brain dead again.


We need proceed in within Flash Builder 4, Run -> Debug -> Other

Under the Main tab under URL or Path to Launch, ensure Use Default is not checked. Also, ensure that Flash Builder will launch your projects SWF file found in the project’s bin-debug folder.

That should fix that so that you can launch the Debug perspective from Flash Builder.

I don’t know why Adobe cannot explain that so simply. I got this resource from this site:


Thanks to that author. Also, it appears it is not current for Flash Builder 4 but the above step should work.

Also, you may need to run->Debug->Other. Click Debug in same panel with same options listed below.

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