Re: [rules-users] Could not execute Rules getting NPE

Hi I am new to Drools. I am using a maven project to connect to guvnor and execute the rules. pom.xml ----------- <dependency> <groupId>org.drools</groupId> <artifactId>drools-compiler</artifactId> <version>5.5.0.Final</version> </dependency> Code ----- public static void main(String[] args) throws InstantiationException, IllegalAccessException { KnowledgeAgent ruleAgent = KnowledgeAgentFactory.newKnowledgeAgent("/Guvnor.properties"); System.out.println(ruleAgent.getKnowledgeBase().getFactType("org.sample","NumberTest")); KnowledgeBase ruleBase = ruleAgent.getKnowledgeBase(); System.out.println(ruleBase.getFactType("org.sample","NumberTest")); FactType factType = ruleBase.getFactType("org.sample", "NumberTest"); Object obj = factType.newInstance(); factType.set(obj, "numberone", 2); factType.set(obj, "numbertwo", 1); StatefulKnowledgeSession workingMemory = ruleBase.newStatefulKnowledgeSession(); workingMemory.insert(obj); workingMemory.fireAllRules(); System.out.println(factType.get(obj, "message")); } I am getting the null pointer exception as below: null Exception in thread "main" java.lang.NullPointerException at com.test.drools.guvnor.App.main(App.java:44) I know, that many people has raised this issue, can anyone know why it is causing the issue? Thanks Smurfs -- View this message in context: http://drools.46999.n3.nabble.com/Could-not-execute-Rules-getting-NPE-tp4... 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