[rules-users] "Exists" CE behaviour

Hi , I'm trying to use the *Exists *keyword within my rules with the following snippet : // Create a session KnowledgeBaseConfiguration config = KnowledgeBaseFactory.newKnowledgeBaseConfiguration(); ((RuleBaseConfiguration)config).setRuleBaseUpdateHandler( null ); * KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(config); StatefulKnowledgeSession session = kbase.newStatefulKnowledgeSession(); // Add some objects for (int i=0; i<5; i++) { session.insert(new Foo()); } // Add a DRL to the kbase KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add( ResourceFactory.newClassPathResource( "test/existsTest.drl" ), ResourceType.DRL); kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() ); // Fire rules int fireCount = session.fireAllRules(); *existsTest.drl* : rule "existsTest" when exists (Foo()); //not ( not ( Foo() ) ); (2) then System.out.println("Rule fired..."); end When launched , the rule is not fired (no messages , fireCount 0), but it is when changing exists with a double not condition (2). If the working memory is populated after adding the rules file, the exists CE works as expected. * I've used no RuleBaseUpdateHandler preventing automatic activations to be executed so fireAllRules can be used to get the fireCount, but commenting this line out doesn't change the results. Probably i'm doing something wrong so a little help would be very appreciated. Regards, Manuel.