How to catch all uncaught errors in a dart polymer app?

Question

I want to put in a handler that will catch all unhandled errors in a Polymer app.

I figured Zone would be the trick so tried

void main() {
  runZoned(() => initPolymer(), onError: (e, stackTrace) {
    _log.shout('TOP ZONE', e, stackTrace);
  });
}

But that doesn't work. The errors never get to this error handler.

Not sure if this relates to http://code.google.com/p/dart/issues/detail?id=15854

How do people handle this?

Answer 1

How about using Window.onError.

import 'dart:html';

main() {
  window.onError.listen((ErrorEvent e) => print(e.message));
  throw 'boom!';
}

Answer 2

So I know we have gotten error handling to work using the following construct:

runZoned(() {
   return initPolymer().run(() => Polymer.onReady
       .then(doSomeStuff)
       .whenComplete(doSomeCompleting));
 },
 onError: (err, [stackTrace]) {
   logger.severe("Received an error", err, stackTrace);
 });

I have posted it in the interest of helping you quickly. I dont have a great explanation off the top of my head why your version isn't working at the moment. Ill do some digging and see if I can work out what is really different.