Howto access instance method from external JavaScript?

Hello,

I am looking for a way to post to my event bus via user defined
javascript.

This is what I came up with, but the event is not fired. What's wrong?

// I call this during onModuleLoad
public native void registerExternalEventSink() /*-{
$wnd.fireExternalEvent =
this.@org.test.Gwt_platform_client::fireExternalEvent(Ljava/lang/
String;);
}-*/;

private void fireExternalEvent(String eventData) {
SomeEvent.fire(ginjector.getEventBus(), eventData);
}

js call:

fireExternalEvent("mydata"); // event is not triggered

Thanks for your input!

Kai

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