How to catch all exceptions in Flex?

Question

When I run a Flex application in the debug flash player I get an exception pop up as soon as something unexpected happened. However when a customer uses the application he d

Answer 1

I'm using flex 4. I tried loaderInfo.UncaughtErrorEvents, but loaderInfo was not initialized so it gave me null reference error. Then i tried root.loaderInfo.UncaughtErrorEvents and the same story. I tried sprite.root.UncaughtErrorEvents, but there was no sprite object, I created one, but it didn't work. Finally I tried

systemManager.loaderInfo.uncaughtErrorEvents.addEventListener(UncaughtErrorEvent.UNCAUGHT_ERROR,globalUnCaughtErrorHandler.hanleUnCaughtError);

And guess what, it works like magic. check this

Answer 2

It works in Flex 3.5 and flash player 10:

  <?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" addedToStage="application1_addedToStageHandler(event)">
    <mx:Script>
        <![CDATA[
            import mx.events.FlexEvent;
            
            protected function application1_addedToStageHandler(event:Event):void{              
                if(loaderInfo.hasOwnProperty("uncaughtErrorEvents")){
                    IEventDispatcher(loaderInfo["uncaughtErrorEvents"]).addEventListener("uncaughtError", uncaughtErrorHandler);
                }
                
                sdk.text = "Flex " + mx_internal::VERSION;
            }
            
            private function uncaughtErrorHandler(e:*):void{
                e.preventDefault();
                
                var s:String;

                if (e.error is Error)
                {
                    var error:Error = e.error as Error;
                    s = "Uncaught Error: " + error.errorID + ", " + error.name + ", " + error.message;
                }
                else
                {
                    var errorEvent:ErrorEvent = e.error as ErrorEvent;
                    s = "Uncaught ErrorEvent: " + errorEvent.text;
                }
                
                msg.text = s;
            }
            
            private function unCaught():void
            {
                var foo:String = null;
                trace(foo.length);
            }
        ]]>
    </mx:Script>
    <mx:VBox>
        <mx:Label id="sdk" fontSize="18"/>
        <mx:Button y="50" label="UnCaught Error" click="unCaught();" />
        <mx:TextArea id="msg" width="180" height="70"/>
    </mx:VBox>
</mx:Application>

Thanks

Answer 3

Now you can, using loader info:

http://www.adobe.com/devnet/flex/articles/global-exception-handling.html

Checkout:

loaderInfo.uncaughtErrorEvents.addEventListener(UncaughtErrorEvent.UNCAUGHT_ERROR, onUncaughtError);

private function onUncaughtError(e:UncaughtErrorEvent):void
{
    // Do something with your error.
}