This isn't my code. It's created when a Drools project is created in Eclipse. I guess that's why this is so frustrating. It's supposed to demonstrate a very simple Drools program and I can't get it to work. It's hard to debug someone else's code when you don't know the language yet.

Code is kSession.insert(message);

Thanks

sdjoe [via Drools] wrote:

Hard to say without seeing your code. Can you post it here and point out where the NPE is happening on line 23?

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NAML

package com.sample;

import org.kie.api.KieServices;
import org.kie.api.runtime.KieContainer;
import org.kie.api.runtime.KieSession;

/**
* This is a sample class to launch a rule.
*/
public class DroolsTest {

public static final void main(String[] args) {
try {
// load up the knowledge base
KieServices ks = KieServices.Factory.get();
KieContainer kContainer = ks.getKieClasspathContainer();
KieSession kSession = kContainer.newKieSession("ksession-rules");

// go !
Message message = new Message();
message.setMessage("Hello World");
message.setStatus(Message.HELLO);
kSession.insert(message);
kSession.fireAllRules();
} catch (Throwable t) {
t.printStackTrace();
}
}

public static class Message {

public static final int HELLO = 0;
public static final int GOODBYE = 1;

private String message;

private int status;

public String getMessage() {
return this.message;
}

public void setMessage(String message) {
this.message = message;
}

public int getStatus() {
return this.status;
}

public void setStatus(int status) {
this.status = status;
}

}

}

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