JESS: JessListener

[levent kent]

Hi,

I am developing an academic application with Jess & Jade.
Is there any simple way to get all facts which are just inserted? Iterating
over all the facts in working memory would be very inefficient, right?

I actually tried to add a JessListener
public class KitchenJessListener implements JessListener{
    public void eventHappened(JessEvent event) throws JessException {
        Object o=event.getObject();;
        if(event.getType()== JessEvent.FACT) {
            o=event.getObject();
        }
        System.out.println("event:"+o.toString());
    }
} using addJessListener function,
but the function is never invoked, though I insert new facts to the working
memory in run time.

Any ideas?

--
Levent Kent