How event distribution works

After you publish the events,

 private void publish(Object object, Object publisher)

above line in ComponentRegistry.java will try to distribute the event to all the listeners (registered by using subscribe)

the actual line to call the receive() method in subscribers is

 profile.getMethod().invoke(subscriber, object, publisher);

above line is in publishToSubscriberHelper() in ComponentRegistry.java

so

You can set a break point in

 private void publish(Object object, Object publisher)

Or, even if this is not the place you want, at least you have a point to start.