I'm getting an exception - java.lang.ClassCastException: java.lang.Boolean - in Drools 5.4 when I execute the following: private void createAllFactors(StatefulKnowledgeSession ksession, Map<String, Product> productsHashMap) { List<FactHandle> facts = new ArrayList<FactHandle>(); if (productsHashMap != null){ for (Map.Entry<String, Product> entry: productsHashMap.entrySet()) { facts.add(ksession.insert(entry.getValue())); } } ksession.startProcess("Factors"); ksession.fireAllRules(); for(FactHandle fact : facts) { try { ksession.retract(fact); } catch (Exception e) { logger.error(e.getMessage()); } } } I do not get this error when I run in Drools 5.0.1. Any help is greatly appreciated. Thank you in advance. -Dean -- View this message in context: http://drools.46999.n3.nabble.com/java-lang-ClassCastException-java-lang-... Sent from the Drools: User forum mailing list archive at Nabble.com.