BC4J Audit Users Sample - How to use in a Class Diagram

I downloaded/reviewed the BC4J sample for auditing users, and am trying to incorporate it into a Class Diagram,
so I can explicitly show that my 'Entity' extends EntityAudit. When I create an 'EntityAuditImpl' Entity Object in the Class
Modeller, and then try to indicate that my 'Entity' extends EntityAuditImpl, I get a null pointer exception when applying the change.
Help! What is the proper way to express the relationship is a Class Diagram?

Randy,
It sounds as though you're trying to model the type of relationship where one entity object extends another one - which
in this case isn't the right relationship. In this case only the Java classes are being extended. So if your new EO is
called MyEO:
EntityAuditImpl extends EntityImpl
MyEOImpl extends EntityAuditImpl
One way to model this relationship:
1. Add a new entity object (MyEO) to your UML diagram
2. On the diagram, double-click MyEO to edit your entity object
3. In the entity object editor, select the Java page then click Extends...
4. In the Base Classes dialog, click Browse... to the right of the Row field, and navigate to EntityAuditImpl
5. Click OK, OK, OK to dismiss all of the dialogs.
If you take a look at MyEOImpl.java you'll see that the class extends EntityAuditImpl.
6. On the diagram, right-click MyEO and select Show Implementation Files. This adds MyEOImpl to the diagram.
7. Now, right-click MyEOImpl and select Show Related Elements. This adds EntityAuditImpl to the diagram, and shows
it as being the superclass of MyEOImpl.
Hope this helps
Blaise

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