Hi, this is the experiences from many people who already pass the
SCEA exam. SCEA looks for business domain objects in class diagram. Those are technology independent. The component and sequence diagram is where you put all the J2EE related stuff plus external systems.
Many people also point out that in real life they will not architect their system in this way. I am just sharing my experience on passing the SCEA.
And to answer your seq diagram question, it really depends on what level of detail you want to show the marker. Some people passed by giving very detailed classes interaction. Some passed by just showing interaction between components. I prefer showing the interaction between components and tiers because to me, showing the detail classes interactions are too low level. (by the way, sometimes class is depicted as component because it is really important, such as an stateless session bean used as a session facade)
[ September 01, 2005: Message edited by: Jeremy Hsu ]