GWT.setUncaughtExceptionHandler()

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I believe what’s happening here is that the current JS event cycle is using the DefaultUncaughtExceptionHandler because that was the handler set at the start of the cycle. You’ll need to defer further initialization to the next event cycle, like this:

public void onModuleLoad() {
    GWT.setUncaughtExceptionHandler(new ClientExceptionHandler());
    Scheduler.get().scheduleDeferred(new ScheduledCommand() {
        @Override
        public void execute() {
           startApplication();
           Window.alert("You won't see this");
        }
    });
}

private void startApplication() {
    Integer.parseInt("I_AM_NOT_A_NUMBER");
    // or any exception that results from server call
}

Update: And here’s the issue that describes why this works, and why it isn’t planned to be fixed.

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