If you look at the component diagrams in the
SCEA study guide by Cade and Roberts, you will not find an entity bean on any of them. Can you imagine this system w/o an entity bean?
If you research
Applying UML and Patterns or
UML Distilled on the subject of component diagrams you will wonder about Sun's competency.
Must be it's like college, just turn something in. People who pass seem to lose more points on the class diagram.
Just my 2 cents.