[rules-users] declare variable

[fakhfakh ismail]

Hello,
first sorry for my bad english.
I want to declare a variable of type List

rule "userrole"
 
when
  $user1: User (userid1: userId)
  $user2: User (userId == userid1)
  then
     List L = new ArrayList();
        if (L.contains($user1.getname())== false)
        {
            L.add($user1.getname());
            System.out.println("hello");
        }
    end

the problem is everytime the List don't save all element every execution the variable  list is intialised as empty is there other place to declare List?
(I try after when but error of parsing)

 	      
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