[rules-users] Problem with Banking Tutorial

Hello, I have a problem with the banking tutorial number 3, which is part of the examples of drools expert. It simply adds some Numbers as facts, and retracts them in an increasing order. It is very short, therefore I post the whole Code: BankingExample3.java _________________________________________________ package org.drools.tutorials.banking; public class BankingExample3 { public static void main(String[] args) { Number[] numbers = new Number[] {wrap(3), wrap(1), wrap(4), wrap(1), wrap(5)}; new RuleRunner().runRules( new String[] { "Example3.drl" }, numbers ); } private static Integer wrap(int i) { return new Integer(i); } } _________________________________________________ Example3.drl: _________________________________________________ package org.drools.tutorials.banking rule "Rule 01" when $number : Number() not Number( intValue < $number.intValue ) then System.out.println("Number found with value: " + $number.intValue() ); retract( $number ); end _________________________________________________ Output: _________________________________________________ Loading file: Example3.drl Inserting fact: 3 Inserting fact: 1 Inserting fact: 4 Inserting fact: 1 Inserting fact: 5 Number found with value: 1 Number found with value: 1 Number found with value: 3 Number found with value: 4 Number found with value: 5 _________________________________________________ that seams absolute logically to me. But now I alter the Numbers in the Java-Part: Number[] numbers = new Number[] {wrap(3), wrap(1), wrap(2)}; and the output destroys everything I thought I understood: Loading file: Example3.drl Inserting fact: 3 Inserting fact: 1 Inserting fact: 2 Number found with value: 1 Number found with value: 3 Number found with value: 2 Can someone reproduce this behavior?? It seams absolutely strange to me. I would have expected the order 1,2,3. Any explanations? Thanks in advance for helping me!