>>   If this is so, then what we have is a memory leak. In a GC'd system.
> 
> It's definitely a problem. Some would argue that it's not technically a 
> memory leak, but rather a failure to disconnect the Listener from the 
> Engine. It's easier to diagnose (if it's deterministic, at least), 
> because you see the Engine's list growing indefinitely. You don't lose 
> memory and not know what's in it.

It would be a leak if the Engine kept *strong* references to the 
Listeners. Then the Listeners would never get GC'd.

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