[rules-users] irrational behaviour by drools engine

[Avin]

Hi,
I have a hashmap inserted as global variable and some objects as facts.
In drools i try to locate object from hashmap using facts. It behaves
differently and i dont know why. I will post my code and then try to
describe the behaviour

global java.util.Map encapsulationMap;
rule "test rule"
no-loop
when
EncapsulatingObject($key : id == 7) 
EncapsulatingObject(   encapsulationMap[$key+""] !=null)
//eval( encapsulationMap.get($key+"") != null)   working
then
System.out.println("key is "+$key +" value is  ::: 
"+encapsulationMap.get($key+"")); 
end
Out put 
key is 7 value is  :::  Encapsulating object key 7
key is 7 value is  :::  Encapsulating object key 7
key is 7 value is  :::  Encapsulating object key 7
key is 7 value is  :::  Encapsulating object key 7
key is 7 value is  :::  Encapsulating object key 7
key is 7 value is  :::  Encapsulating object key 7
key is 7 value is  :::  Encapsulating object key 7
key is 7 value is  :::  Encapsulating object key 7
key is 7 value is  :::  Encapsulating object key 7

Explanation :
I have objects of Encapsulating  as facts. same type of objects are present
in hashmap. Field id is getting used for hashcode and for equals to store it
in hashmap.
I am inserting 9 facts and all of them are unique. Number of occurance if
you see are 9. 
1. I dont know why it behaves like this?  i think there should have been
just 1 object.
2. If I *comment out EncapsulatingObject(   encapsulationMap[$key+""]
!=null)*
and *uncomment eval* i get proper results i.e only one output. BZut i want
to assign object to a variable hence i have to use *EncapsulatingObject(  
encapsulationMap[$key+""] !=null)*

Can any one explain me this behaviour ?
What am i missing or where am i going wrong.
Please help 
Thanks and Regards
Avin



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