Ken,

Neither solution makes any assumption about data storage. Hibernate entities could be used or simple POJOs, matters not. As to your Example, I have used something similar to the following:

public class Entity {

    private String firstName;
   
    public String getFirstName() { return firstName; }
    public void setFirstname(String firstName) { this.firstName = firstName; }
}

public class FactEntity {
    private Entity entity;
    private String additionalAttribute;

    public FactEntity(Entity entity) { this.entity = entity; }
    public Entity getEntity() { return entity; }
    public void setEntity(Entity entity) { this.entity = entity; }
    public String getAdditionalAttribute() { return additionalAttribute; }
    public void setAdditionalAttribute(String additionalAttribute) { this.additionalAttribute = additionalAttribute; }
}

In your class that inserts the Entity facts into working memory, you just;

    FactEntity fe = new FactEntity(originalEntity);
    workingMemory.insert(fe);

In your rule, you can then do something like;

rule
    when
        $fe : FactEntity(additionalAttribute == "Supervisor")
    then
       System.out.println($fe.entity.firstName);
end

Earnie!