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.
But you should be circumspect about what sort of Exception you are throwing. I would enhance what you have written toNote that much of what I wrote is actually documentation comments, so users of that method know about the Exception.