I am using the following code to add to knowledge builder and run it: knowledgeBuilder.add(ResourceFactory.newClassPathResource("QueueFlow.rf", GuvnorTest.class), ResourceType.DRF) // ruleflow knowledgeBuilder.add(ResourceFactory.newUrlResource("http://..."), ResourceType.PKG) // guvnor package My rule flow is connection of two tables. I set a property in action of one decision table and use it as a condition in another decision table to get the desired result. If I run the above code, I don't get any exception but the output is 'null'.