[rules-users] Constraints over Lists

[Phani Saripalli]

Hi, I have a query reg. writing constraints over lists. 

Precisely heres what I m doing

//Imports
import java.util.List;
import java.util.Set;
import java.util.Arrays;
import java.util.ArrayList;

//My methods - functions

function boolean isDefined(Object ob) { 
	return ob != null;		
}

function boolean neqq(List l1, List l2) {
	return l1 != l2;
}

//List declaration
declare Project
@typesafe (false) 
	list1 : List
	list2 : List
end

//Initial declaration rule
rule " Config rule " 
 agenda-group "Group Config"
dialect "mvel"
no-loop true
lock-on-active true
	when
		P : Project()
	then
		modify(P) {
		list1 = new java.util.ArrayList(java.util.Arrays.asList(10, 15, 20, 25)), 
		list2 = new java.util.ArrayList(java.util.Arrays.asList(11, 2, 3, 4, 5,
10, 9, 8, 7))
		};
update(P);
end 

//Rule-constraint

rule "listEq1"
agenda-group "Group 2"
dialect "mvel"
no-loop true
lock-on-active true
when

P : Project( isDefined(P.list1) 
&&  neqq(P.list1, new java.util.ArrayList(java.util.Arrays.asList(1, 2, 3)))
	)

then
	System.out.println("Lists are not equal - 1");	
end

//Rule - constraint 2
rule "listEq2"
agenda-group "Group 2"
dialect "mvel"
no-loop true
lock-on-active true
when

P : Project( isDefined(P.list1)  && isDefined(P.list2)
&&  neqq(P.list1, P.list2)
	)

then
	System.out.println("Lists are not equal - 2");	
end

******************

If I remove the rule "listEq1", everything works fine, other it raises
several exceptions like 
- Exception executing consequence for rule " Config rule "
- cannot invoke method asList
- cannot invoke method neqq

Can anyone tell me whats going on here, whats the reason for this.

Many thanks :)
Phani



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