I cannot validate your approach and I should not. Sorry.
Please refer to Case Study in the Cade Roberts SCEA Study guide.
Component diagrams should have only Components (Ex: J2EE components like EJB,
JSP,
Servlets etc), J2EE/Core
Java Patterns (like DAO, Service Delegate etc), Reference to other Subsystems as you have mentioned and should clearly depict the flow between these components.
Hope this helps.