[rules-users] BEST_FIT Null Pointer Exception

[newbie]

I am currently using final 6.0 and I used
<constructionHeuristicType>BEST_FIT</constructionHeuristicType> but after I
have run it propmts java.lang.NullPointerException pointing to my
PlanningVariableStrengComparator. Did I miss something? My planning variable
comparator by the way is : 

public class MyVariableStrengthComparator implements Comparator<MyVariable>,
Serializable {

    public int compare(MyVariable a, MyVariable b) {
        return new CompareToBuilder()
                .append(a.getId(), b.getId())
                .toComparison();
    }

}



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