Hi All, I am getting Nullpointer exception the application is trying to reloadKnwledgeBase. I have the following code in application. public void init() { logger.info("Group Rule Engine Initiated..!!"); /** * Polling interval needs to be externalized */ knowledgeAgent = KnowledgeAgentFactory.newKnowledgeAgent("FiveSeries"); knowledgeAgent.applyChangeSet(ResourceFactory .newFileResource(propertyReader .getProperty("DROOLS_GUVNOR_CHAGNE_SET_XML_PATH"))); ResourceFactory.getResourceChangeScannerService().start(); ResourceFactory.getResourceChangeNotifierService().start(); if (knowledgeAgent != null && knowledgeAgent.getKnowledgeBase()!=null && !knowledgeAgent.getKnowledgeBase().getKnowledgePackages().isEmpty()) { knowledgeBase = knowledgeAgent.getKnowledgeBase(); } logger.info("Group Rule Engine is ready to use..!!"); } public void reloadKnowledgeBase() { if (knowledgeAgent != null && knowledgeAgent.getKnowledgeBase()!=null && !knowledgeAgent.getKnowledgeBase().getKnowledgePackages().isEmpty()) { knowledgeBase = knowledgeAgent.getKnowledgeBase(); logger.debug("KnowledgeBase reloaded..!!"); } else { logger.info("KnowledgeBase not reloaded..!!"); ResourceFactory.getResourceChangeScannerService().stop(); ResourceFactory.getResourceChangeNotifierService().stop(); init(); } } reloadKnowledgeBase() is called once in application during Login. The problem is occurring in Development application. When I am using that Change-Set.xml in my local application, it is working perfectly fine. I m not getting the problem. I bounced both Jboss and application servers but still no luck! -- View this message in context: http://drools.46999.n3.nabble.com/reloadKnowledgeBase-java-lang-NullPoint... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users