Given this rule

rule "show no gaps"
when
    not Gap()
then
    System.out.println( "No gaps!" );
end

the ActivationCreatedEvent references an Activation, where the list of
fact handles (getFactHandles) contains one element, but its Object is null:
   Fact null @0:0:27032609:1306428912:0:DEFAULT
But the list of objects (getObjects) returns a list where there *is* an object:
   Object (org.drools.reteoo.InitialFactImpl): org.drools.reteoo.InitialFactImpl@4dde85f0

I think that this should be changed; neither a fact handle nor an object should
be returned if there are no user objects participating in the activation.

Cheers
Wolfgang