I'm a bit confused as to how this relates to your previous post. Where are you getting the exception? Something like this would work: File dsl = new File("Path of your rule"); KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newFileResource(dsl), ResourceType.DRL); KnowledgeBase kbase = kbuilder.newKnowledgeBase(); StatefulKnowledgeSession session = kbase.newStatefulKnowledgeSession(); FactType airlineType = kbase.getFactType("droolshelloworld", "Airline"); Object ob = airlineType.newInstance(); airlineType.set(ob, "name", "//Airline"); session.insert(ob); session.fireAllRules(); And your rule looks like this: declare Airline name:String end rule"Test" when message:Airline(name=="//Airline") then System.out.println("Hello Richa....."); end As I said in my previous post. You really need to read some tutorials on this. -- View this message in context: http://drools.46999.n3.nabble.com/Pass-Parameter-to-drools-file-dynamical... Sent from the Drools: User forum mailing list archive at Nabble.com.