I have read that technology specific stereotypes should be added to the class diagram - I have decided on <<JPA entity class>> for my entities, <<JSP page>> for my views, <<stateless session bean>> for my managers/helpers and <<stateful session bean>> for my controllers. I was wondering if the classes should carry those stereotypes also when referenced within sequence diagrams...
Also, I guess it is safe to assume that when using JPA entity classes, no DAOs are needed. Furthermore I have refrained from referencing the EntityManager within my diagrams, similar to the rest of JEE services & classes.
Finally, I have assumed that persist calls don't have to be shown within the sequence diagrams, unless they are explicitly stated within the use case description (especially when using JPA).