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.
ClassCastException means that you try to assign to variable wrong type. Type of variable does not have type of object you assign to it.
Simply change variable type to type of what you assign to it.
This causes exception