[rules-users] NullPointerException when calling FactType.set and FactType.setFromMap

[Patel, Ronak (Autonomy)]

Ah, OK, thanks for the clarification. I'll give the Java Reflection API a try with this in that case.

On May 6, 2014, at 1:10 PM, "Michael Anstis" <michael.anstis at gmail.com<mailto:michael.anstis at gmail.com>> wrote:


Data Modeller generates Java classes in 6.x whereas we generated DRL Declarative Types before.

The getFactType() API is for manipulating declared types.  Java's standard Reflection API is for manipulating Java classes.

Sent on the move

On 6 May 2014 20:57, "Patel, Ronak (Autonomy)" <ronak.patel at hp.com<mailto:ronak.patel at hp.com>> wrote:
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

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