try {
  super.fireEvent(event);
} catch (UmbrellaException ue) {
  for (Throwable t : ue.getCauses()) {
    // here, use your code that prints the stack-trace; and if it's not 
enough, loop over the getCause() hierarchy
  }
}

An UncaughtExceptionHandler is a "global catch": basically, your GWT code is 
run in a big try/catch, so any exception you don't catch will go to your 
UncaughtExceptionHandler (if you set one; or they'll generate "JavaScript 
errors" in your browser console)

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