[rules-users] Rules not firing when expected after retracting object in list

[Justin Beltran]

Hi, 

I'm coming across some weird behavior in Drools 4.0.7, but maybe it's just
cause I don't understand I how Drools works.  Assume, there's a class "A"
that has a property called "property". 

As facts, I have the following list of A's: 
A1, property = 123 
A2, property = 345 
A3, property = 123 

I have two rules as follows: 

rule "Rule 1 - Remove all A's that have property set to 123" 
  salience 1000 
  lock-on-active true 
when 
  $listOfAs : ArrayList collect(A( property == "123" )) 
then 
  for (Object a: $listOfAs ) {   
      retract (a) 
  } 
end 

rule "Rule 2 - Do stuff with remaining A's" 
  salience 900 
  lock-on-active true 
when 
  $listOfAs : ArrayList collect(A()) 
then 
... 
end 

My understanding is "Rule 1" will remove the facts of class A that have
property to 123.  When it gets to "Rule 2", shouldn't the "listOfAs" only
have that one A that remains (i.e. the one where property is set to "345").
What I'm noticing is that "Rule 2" just doesn't execute at all even though
I'm assuming there is still one "A" object that hasn't been retracted.  If I
comment out the "retract" it executes "Rule 2" fine. 

Am I missing something about these rules work? 

Thanks. 
Justin

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