This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
Within the Component Diagram, would it be advisable to denote an external tool (a jar file) as an external system which is accessed by a DAO on the integration tier? Or as a simple component on the business logic and presentation tier?
Also, a simple jar file should not be referenced within the deployment diagram, since it is packaged within the application, correct?