Hello all,

I’m getting a NullPointerException when calling org.kie.api.definition.type.FactType.set(Object, String, Object) and also when I call org.kie.api.definition.type.FactType.setFromMap(Object, Map<String, Object>). The exception stack trace points to the same line in both cases:

Exception in thread "main" java.lang.NullPointerException

       at org.drools.core.factmodel.ClassDefinition.set(ClassDefinition.java:255)

       ...

Doing some debugging, I found that the getFieldAccessor() call in org.drools.core.factmodel.ClassDefinition, line 255, is returning null, which is what’s causing this. I didn’t dig deeper than that, though.

I created the data model in Drools Workbench 6.0.1 final and I’ve double-checked that the field I’m passing in to set a value exists on the object. Below is my code and it’s throwing the NPE on the last line.

I’m going to try to use standard Java reflection instead for now, but any assistance on this would be appreciated. I can provide any other code, the KieModule JAR produced by Workbench, or anything else, if needed.

        KieServices ks = KieServices.Factory.get();

        KieContainer kContainer = ks.newKieContainer(ks.newReleaseId("com.hp.pa.sample", "realestate", "LATEST"));

        KieSession kSession = kContainer.newKieSession();

        KieBase kBase = kSession.getKieBase();

        FactType agentAssignmentType = kBase.getFactType("com.hp.pa.sample.realestate", "AgentAssignmentData");

        FactType property4SaleType = kBase.getFactType("com.hp.pa.sample.realestate", "PropertyForSale");

if (agentAssignmentType == null || property4SaleType == null)

            System.err.println("Could not find a FactType");

        Object agentAssignment = null;

        Object property4Sale = null;

try {

            agentAssignment = agentAssignmentType.newInstance();

            property4Sale = property4SaleType.newInstance();

        } catch (InstantiationException e) {

            e.printStackTrace();

        } catch (IllegalAccessException e) {

            e.printStackTrace();

        }      

        property4SaleType.set(property4Sale, "city", "San Diego");

Thank you,

Ronak Patel
Software Designer
HP Autonomy