How to turn on Pause On Uncaught Exceptions in Google Chrome Canary?
The docuemntation is a little bit outdated.
In the new Chrome versions the "pause on exception" button doesn't toggle anymore between 3 states (disabled, "Pause on Exceptions","Pause on Uncaught Exceptions") but only between two states (disabled and "Pause on Exception").
In order to be able to also break on caught exceptions they introduced this checkbox (this is useful if you have a global exception handler in GWT but still want to break when the exception is thrown).
So if you don't catch the exception then the settings you have shown in your screenshot should work.