Hi all, I follow the last reply in "http://drools.46999.n3.nabble.com/KnowledgeAgent-not-reloading-KnowledgeBase-td121401.html" and use the static method in following class to obtain knowledge base: public class DroolsCore { private static KnowledgeAgent kagent = null; private static KnowledgeBase knowledgeBase = null; public static KnowledgeBase createKnowledgeBase() { if(kagent == null && knowledgeBase == null) { ResourceChangeScannerConfiguration sconf = ResourceFactory.getResourceChangeScannerService().newResourceChangeScannerConfiguration(); sconf.setProperty("drools.resource.scanner.interval", "10"); ResourceFactory.getResourceChangeScannerService().configure(sconf); ResourceFactory.getResourceChangeScannerService().start(); ResourceFactory.getResourceChangeNotifierService().start(); kagent = KnowledgeAgentFactory.newKnowledgeAgent("myagent"); kagent.applyChangeSet(ResourceFactory.newClassPathResource("resource/changeSet.xml")); knowledgeBase = kagent.getKnowledgeBase(); } return knowledgeBase; } } I have the my changeSet.xml as follows: <?xml version="1.0" encoding="UTF-8"?> <change-set xmlns='http://drools.org/drools-5.0/change-set' xmlns:xs='http://www.w3.org/2001/XMLSchema-instance' xs:schemaLocation='http://drools.org/drools-5.0/change-set http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/... <add> <resource source='classpath:resource/rules/' type='DRL' /> <resource source='classpath:resource/flows/' type='DRF' /> </add> </change-set> After deploying the application as webapp, I can run the flow + rule all right. However, when I switch the execution order in my flow file on the fly and run the app again (by cliking a link), I get the same result as the flow has never been changed. Moreover, I get the following error message when I uninstall the webapp from my application server (WASCE/geronimo 2.1): Exception in thread "Thread-44" java.lang.RuntimeException: This Resource cannot be listed, or is not a directory at org.drools.io.impl.ClassPathResource.listResources(ClassPathResource. java:191) at org.drools.io.impl.ResourceChangeScannerImpl.scan(ResourceChangeScann erImpl.java:130) at org.drools.io.impl.ResourceChangeScannerImpl$ProcessChangeSet.run(Res ourceChangeScannerImpl.java:311) at java.lang.Thread.run(Thread.java:735) Any help is appreciated. -- View this message in context: http://drools.46999.n3.nabble.com/knowledge-agent-unable-to-update-rule-f... Sent from the Drools: User forum mailing list archive at Nabble.com.