[rules-users] Issue with "contains" keyword

I'm doing some simple evaluation of jrules and I ran into a problem. Here's the rule I'm having problems with: rule "751845 - Check Stages" when order : Order( stages excludes 921 ) then System.out.println( "This order contains " + order.getStages() ); end OUTPUT: This order contains [804, 921] I'm actually trying to do the opposite using 'stages contains 921'. stages is defined as follows in the Order object. private ArrayList<Integer> stages; I'm using the 3.0.6 binaries on W2K w/Eclipse. Any ideas what I'm doing wrong here?