Exception error handling on the client-side

I was under the impression that I could use
GWT.UncaughtExceptionHandler and subsequently
GWT.setUncaughtExceptionHandler to catch uncaught exceptions in the
client. Basically, I'd like to display the stacktrace of any uncaught
exception in a dialog.

I had a bug in my code whereby a I was trying to iterate over a null
list and it should have thrown a NullPointerException, but my error
handling code was never triggered. However, if I add a button with a
select handler that simply throws a new runtime exception, it works.

Anyone know what I might be doing wrong here or how to implement the
uncaught exception handler correctly? Thanks.

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